TinkerPop3 CHANGELOG

TinkerPop 3.7.0 (NOT OFFICIALLY NAMED YET)

TinkerPop 3.7.0 (Release Date: NOT OFFICIALLY RELEASED YET)

This release also includes changes from 3.6.XXX.

Removed connectOnStartup configuration option from gremlin-javascript.
Changed Gremlin.version() to read from the more specificly named tinkerpop-version attribute.
Added warning on vertex property cardinality mismatch when reading GraphML.
Bumped to ws 8.x for gremlin-javascript.
Added support for mid-traversal E()-steps to Gremlin core and GLV’s.
Added nullable annotations to Gremlin.NET.
Bumped Objenesis to 3.3 in gremlin-shaded.
Moves java serializer, message and token classes from gremlin-driver to a new gremlin-util module.
Moves SimpleSocketServer and its initializers to a new gremlin-tools/gremlin-socket-server module.
Configures gremlin-socket-server to build a docker image which can be used for testing GLV’s. (Can be skipped with -DskipImageBuild)
Reduces dependency from gremlin-server onto gremlin-driver to a test scope only.

TinkerPop 3.6.0 (Tinkerheart)

TinkerPop 3.6.2 (Release Date: NOT OFFICIALLY RELEASED YET)

This release also includes changes from 3.5.5.

Fixed bug in the Gremlin grammar for parsing of empty queries.
Provided mechanism for provider plugins to get notified on script/query processing via GraphManager.
Fixed bug in select() when using multiple labels.
Moved Gherkin feature tests to gremlin-test resources so that they are more easily referenced by providers.
Made quality of life changes to semantics for mergeV/E based on initial feedback.

TinkerPop 3.6.1 (Release Date: July 18, 2022)

This release also includes changes from 3.5.4.

Made GraphBinary the default serialization format for .NET and Python.
Added missing ResponseStatusCodeEnum entry for 595 for .NET.
Fix a javadoc comment in Cluster.Builder regarding maxInProcessPerConnection.

Bugs

TINKERPOP-2734 NullPointerException when calling Client chooseConnection()
TINKERPOP-2736 PluginAcceptor interface no more available in 3.5.3+ but referred in documentation
TINKERPOP-2741 GraphMLWriter error message is not properly formatted
TINKERPOP-2746 Medium security vulnerabilities on logback-core
TINKERPOP-2751 Transaction: tx.commit() hangs up in javascript client-lib
TINKERPOP-2754 Javascript client hangs if the server restarts
TINKERPOP-2768 BranchStep pickToken should be integrated when added as a child option

Improvements

TINKERPOP-2229 JavaScript GLV: Add GraphBinary Support
TINKERPOP-2631 GraphSON float serialization when ujson is used is imprecise
TINKERPOP-2693 Complete GraphBinary support in Python
TINKERPOP-2715 remove log4jv1 dependency
TINKERPOP-2723 Make GraphBinary the default serialization format for .NET and Python (breaking)
TINKERPOP-2740 first request suspend more than 9s when using gremlin-java-driver
TINKERPOP-2748 Medium security vulnerability on netty-all and netty-codec
TINKERPOP-2762 getScopeKeys should respect the order of keys passed in Step
TINKERPOP-2764 AWS Neptune returns an inaccessible structured error response

TinkerPop 3.6.0 (Release Date: April 4, 2022)

This release also includes changes from 3.5.3.

Added parser support for NaN and Infinity.
Implemented comparability/orderability semantics defined in the Graph Provider documentation.
Added TextP.regex and TextP.notRegex.
Changed TinkerGraph to allow identifiers to be heterogeneous when filtering.
Prevented values of T to property() from being null.
Added element() step.
Added call() step.
Added fail() step.
Added mergeV() and mergeE() steps.
Added Direction aliases of from and to.
Moved TraversalOptionParent.Pick to its own class as Pick.
Introduced Pythonic Gremlin step names using snake case and deprecated camel case naming.
Improved Gherkin test framework to allow for asserting traversal exceptions as a behavior.
Fixed query indentation for profile metrics where indent levels were not being respected.
TraversalOpProcessor no longer accepts a String representation of Bytecode for the "gremlin" argument which was left to support older versions of the drivers.
Removed requirement that "ids" used to filter vertices and edges need to be all of a single type.
Created gremlin-annotations module where the @GremlinDsl annotation and related code has been moved.
Moved GremlinScriptChecker to gremlin-core from gremlin-groovy since it is not Groovy dependent.
Removed groovy and groovy-json dependencies from gremlin-driver as well as related JsonBuilder serialization support.
Replaced log4j usage with logback where builds rely on and packaged distributions now contain the latter.
Improved behavior of V() and E() when null is an argument producing a filtering behavior rather than an exception.
Prevented metrics computation unless the traversal is in a locked state.
Added syntax to Gremlin grammar to explicitly define byte, short and BigInteger.
Added syntax to Gremlin grammar to allow construction of a reference Vertex.
Changed Gremlin grammar to allow for Groovy-like syntax when parsing a Map literal.
Created a way to produce a corpus of Gremlin traversals via FeatureReader and DocumentationReader in gremlin-language.
Changed mechanism for determining if id equality with toString() is used by validating that elements of the predicate collection are all String rather than enforcing homogenous collections in the process.
Exposed Gherkin tests as part of the provider test suite.
Packaged Gherkin tests and data as standalone package as a convenience distribution.
Removed ProductiveByStrategy as a strategy that is applied by default.
Changed by() modulator semantics to consistently filter.
Removed previously deprecated Gryo MessageSerializer implementations.
Removed previously deprecated AuthenticationSettings.enableAuditLog.
Removed previously deprecated GroovyTranslator from gremlin-groovy module.
Removed previously deprecated Gremlin steps that conflicted with Python keywords.
Removed the dependency on six from gremlin-python.
Bumped to Apache Hadoop 3.3.1.
Bumped to Apache Spark 3.2.0.
Bumped node.js in gremlin-javascript to v16.13.0.
Changed NumberHelper to properly cast to byte and short rather than default coercing to Integer.
Modified some driver defaults (maximum content length, pool size, maximum in process) to be more consistent with one another.
Fixed a potential connection load balancing issue due to a race condition not updating the usage count.
Extended property() to allow for setting a Map of property values.

Bugs

TINKERPOP-2358 Potential connection leak on client disposing
TINKERPOP-2486 Client does not load balance requests across available connections
TINKERPOP-2507 Remove requirement that Graph implementations must filter on homogeneous identifiers (breaking)
TINKERPOP-2522 DefaultTraversalMetrics::toString does not indent annotations correctly
TINKERPOP-2554 Extracting step metrics from ProfileStep throws NPE if the step was not triggered
TINKERPOP-2565 GraphMLWriter does not check vertexLabelKey conflict
TINKERPOP-2566 Incomplete error message in bytecode step generation
TINKERPOP-2568 Graph instance not set for child traversals
TINKERPOP-2569 Reconnect to server if Java driver fails to initialize
TINKERPOP-2578 Set arguments to P within/without are wrapped in List
TINKERPOP-2579 EventStrategy doesn’t work with anonymous traversal
TINKERPOP-2580 Update the custom DSL documentation
TINKERPOP-2585 Traversal failed for different strategies order
TINKERPOP-2589 XML External Entity (XXE) vulnerability
TINKERPOP-2597 NullPointerException while initializing connection pool
TINKERPOP-2598 within(null) NPE
TINKERPOP-2603 TinkerGraph sometimes could not query float values.
TINKERPOP-2604 TinkerGraph could not order vertex/edge without specified property.
TINKERPOP-2606 Neo4j-Gremlin could not order vertex/edge without specified property
TINKERPOP-2609 HTTP returns serialization exceptions for the GraphTraversalSource
TINKERPOP-2610 NumberHelper can return values in the form of their original type smaller than int (breaking)
TINKERPOP-2621 toString for traversals such as within with empty array returns empty string as argument instead of brackets
TINKERPOP-2626 RangeGlobalStep closes traversal prematurely
TINKERPOP-2649 Unable to translate gremlin query to java
TINKERPOP-2658 Translator in gremlin-javascript has trouble with array arguments
TINKERPOP-2661 GremlinGroovyScriptEngine handling of null arguments
TINKERPOP-2662 Unclosed client session and stacktrace pops up when cleanup is missed
TINKERPOP-2670 JavaDocs do not build when using JDK 11
TINKERPOP-2694 Bug of TinkerGraph gremlin api "has()"
TINKERPOP-2702 property(null) throws NPE
TINKERPOP-2706 Traversal clone() not resetting the close state
TINKERPOP-2712 PropertyChangedEvent is triggered before Property is actually changed
TINKERPOP-2717 Gremlin.NET : WebSocketConnection does not check for MessageType.Close, causing error InvalidOperationException: "Received data deserialized into null object message. Cannot operate on it."
TINKERPOP-2719 hasNext is called on TraverserIterator after transaction is committed
TINKERPOP-2726 Python’s GroovyTranslator translates boolean wrong

Improvements

TINKERPOP-2367 Gremlin Translators for .NET
TINKERPOP-2379 Consistent defaults and initialization APIs for drivers
TINKERPOP-2411 Move GremlinDslProcessor to its own artifact (breaking)
TINKERPOP-2467 Follow python naming conventions for Gremlin syntax
TINKERPOP-2504 Intermittently failing server/driver integration tests
TINKERPOP-2518 Enhance .NET gherkin framework to deal with more advanced assertions
TINKERPOP-2524 Expand support for number types in grammar
TINKERPOP-2525 Extend Gherkin tests to cover strategies
TINKERPOP-2534 Log4j flagged as critical security violation
TINKERPOP-2548 Add getter for indexer used in IndexStep
TINKERPOP-2551 Setup scripts to publish Gremint to npm
TINKERPOP-2555 Support for remote transactions in Python
TINKERPOP-2556 Support remote transactions in .NET
TINKERPOP-2557 Support remote transactions in Javascript
TINKERPOP-2559 Stop sending the close message for .NET
TINKERPOP-2560 Stop sending close message for Python
TINKERPOP-2561 Stop sending close message in Javascript
TINKERPOP-2562 Remove GraphSON 2 option in TraversalOpProcessor (breaking)
TINKERPOP-2570 Support custom type in GraphBinary for .NET
TINKERPOP-2576 Setup automatic updates via Dependabot for Gremlin.NET
TINKERPOP-2577 Remove unused test coverage dependencies from Gremlin.NET
TINKERPOP-2582 Construct traversals from gremlin-language
TINKERPOP-2583 Make gremlin-groovy processing optional in Gremlin Server
TINKERPOP-2591 Administrative adjustments to gremlint site
TINKERPOP-2592 Align the style guides
TINKERPOP-2593 Remove Groovy as a dependency from gremlin-driver (breaking)
TINKERPOP-2596 datetime function
TINKERPOP-2601 Unify Gremlin testing behind Gherkin
TINKERPOP-2605 Further enforce and refine null semantics
TINKERPOP-2608 Enhance sample().by() semantics when by produces a null (breaking)
TINKERPOP-2611 Prevent property(id,null) and addV(null) (breaking)
TINKERPOP-2613 Improve behavior of V/E(null)
TINKERPOP-2615 Expand testing of path() with null values
TINKERPOP-2616 Provide better exceptions with SSL related failures (breaking)
TINKERPOP-2620 Clean up NullPointerExceptions related to null arguments on property related steps
TINKERPOP-2630 Clarify that a server cannot support Graphson1.0 over HTTP
TINKERPOP-2632 Netty 4.1.61 flagged with two high severity security violations
TINKERPOP-2635 Consistent by() behavior (breaking)
TINKERPOP-2636 Remove ProductiveByStrategy as a default (breaking)
TINKERPOP-2637 Enhance logging in the Python
TINKERPOP-2639 Remove previously deprecated GryoMessageSerializer infrastructure (breaking)
TINKERPOP-2640 Remove previously deprecated AuthenticationSettings.enableAuditLog setting (breaking)
TINKERPOP-2641 Allow orderability on any type
TINKERPOP-2645 Improve behavior of hasId(null)
TINKERPOP-2646 Make .NET StreamExtensions public for GraphBinary
TINKERPOP-2650 Remove deprecated Gremlin step overloads of python keywords (breaking)
TINKERPOP-2651 Update to .NET 6
TINKERPOP-2652 Add TextP.regex to the text predicate set
TINKERPOP-2656 Provide a no syntax sugar translator for python
TINKERPOP-2657 Remove GroovyTranslator from gremlin-groovy (breaking)
TINKERPOP-2659 Bump javascript runtimes to node v16
TINKERPOP-2660 Bring back close message for drivers
TINKERPOP-2663 Support Vertex references in grammar
TINKERPOP-2665 Add the ability for property() to take a map
TINKERPOP-2666 Create an anonymizing Translator for logging traversals without user data
TINKERPOP-2667 Allow fold() with addAll to work on Map
TINKERPOP-2668 Updating aiohttp requirements at germin-python due to vulnerability
TINKERPOP-2669 Netty 4.1.61 flagged with medium severity security violations
TINKERPOP-2671 Add tx() support to grammar
TINKERPOP-2676 Refactor GremlinScript checker out of groovy package (breaking)
TINKERPOP-2678 jackson-databind medium security issue identified
TINKERPOP-2679 Update JavaScript driver to support processing messages as a stream
TINKERPOP-2680 Create call() step to allow for calling procedures
TINKERPOP-2681 Create merge() step to codify best practice for upsert pattern
TINKERPOP-2682 Enable WebSocket compression in .NET by default
TINKERPOP-2687 Gremlin Boolean Value Expressions 2.0 with Ternary Boolean Logics
TINKERPOP-2688 Investigate two .NET test failures
TINKERPOP-2689 VertexProperty Gherkin support for .NET
TINKERPOP-2690 VertexProperty Gherkin support for Javascript
TINKERPOP-2691 VertexProperty Gherkin support for Python
TINKERPOP-2695 Support NaN/Inf in Parser and Gherkin
TINKERPOP-2705 Support null as an argument where it makes sense in Gremlin.NET
TINKERPOP-2707 Closing parent connection in python should close tx() connections
TINKERPOP-2711 Make gremlin-language optional as it brings in CDDL/GPL dependencies
TINKERPOP-2713 Create an element() step that maps a Property to its Element.
TINKERPOP-2716 Enable eslint for gremlin-javascript project
TINKERPOP-2725 Traversal Strategy Mix Up In Gremlin-Python
TINKERPOP-2727 HasContainer should allow a null key
TINKERPOP-2728 jackson-databind high security issue identified

TinkerPop 3.5.0 (The Sleeping Gremlin: No. 18 Entr’acte Symphonique)

TinkerPop 3.5.5 (Release Date: January 16, 2023)

Changed the Result struct in gremlin-go to make it more suitable for mocking in tests.
Changed label generation in PathProcessorStrategy to be more deterministic.
Bumped to Apache commons-configuration 2.8.0 to fix security vulnerability.
Fixed issue where the GremlinGroovyScriptEngine reused the same translator concurrently which lead to incorrect translations.
Fixed bug where tasks that haven’t started running yet time out due to evaluationTimeout and never send a response back to the client.
Set the exact exception in initializationFailure on the Java driver instead of the root cause.
Improved error message for when from() and to() are unproductive for addE().
Added SparkIOUtil utility to load graph into Spark RDD.
Improved performance of CloneVertexProgram by bypassing the shuffle state of SparkGraphComputer.
Changed JavaTranslator exception handling so that an IllegalArgumentException is used for cases where the method exists but the signature can’t be discerned given the arguments supplied.
Dockerized all test environment for .NET, JavaScript, Python, Go, and Python-based tests for Console, and added Docker as a build requirement.
Async operations in .NET can now be cancelled. This however does not cancel work that is already happening on the server.
Bumped to snakeyaml 1.32 to fix security vulnerability.
Update docker/build.sh to work with docker-compose dockerized tests changes.
Fix permission issues with Docker generated files by setting permission to current user, so sudo isn’t needed for maven operations.
Updated base images for gremlin-server and gremlin-console docker images to support arm64.
Use Go embed for error/logger resources for gremlin-go to avoid missing resource files when using binaries.
Added user agent to web socket handshake in java driver. Can be controlled by a new enableUserAgentOnConnect configuration. It is enabled by default.
Added user agent to web socket handshake in Gremlin.Net driver. Can be controlled by EnableUserAgentOnConnect in ConnectionPoolSettings. It is enabled by default.
Added user agent to web socket handshake in go driver. Can be controlled by a new EnableUserAgentOnConnect setting. It is enabled by default.
Added user agent to web socket handshake in python driver. Can be controlled by a new enable_user_agent_on_connect setting. It is enabled by default.
Added user agent to web socket handshake in javascript driver. Can be controlled by a new enableUserAgentOnConnect option. It is enabled by default.
Added logging in .NET.
Added addDefaultXModule to GraphSONMapper as a shortcut for including a version matched GraphSON extension module.
Modified GraphSONRecordReader and GraphSONRecordWriter to include the GraphSON extension module by default.
Bumped jackson-databind to 2.14.0 to fix security vulnerability.
Bumped to Groovy 2.5.15.
Bumped to Netty 4.1.86.
Bumped ivy to 2.5.1 to fix security vulnerability
Removed default SSL handshake timeout. The SSL handshake timeout will instead be capped by setting connectionSetupTimeoutMillis.
Improved logging for gremlin-driver.
Modified Connection and Host job scheduling in gremlin-driver by dividing their work to two different thread pools and sparing work from the primary pool responsible for submitting requests and reading results.
Prevented usage of the fork-join pool for gremlin-driver job scheduling.
Modified GremlinScriptChecker to extract the Tokens.REQUEST_ID from Gremlin scripts.
Changed Host initialization within a Client to be parallel again in gremlin-driver.
Changed mechanism for determining Host health which should make the driver more resilient to intermittent network failures.
Removed the delay for reconnecting to a potentially unhealthy Host only marking it as unavailable after that initial retry fails.
Prevented fast NoHostAvailableException in favor of more direct exceptions when borrowing connections from the ConnectionPool.
Improved Gherkin tests for more consistent results.
Provides users with potentially more information to driver TimeoutExceptions.
Fixed an issue in Go and Python GLVs where modifying per request settings to override request_id’s was not working correctly.
Fixed incorrect implementation for GraphTraversalSource.With in gremlin-go.
Changed Gremlin.version() to return "VersionNotFound" if the version is missing from the manifest.
Fixed a case sensitivity issue when comparing request UUIDs in gremlin-javascript.

Bugs

TINKERPOP-2765 Race condition during script creation when using UnifiedChannelizer
TINKERPOP-2769 gremlin-server does not reply with a timeout response to all timed out requests
TINKERPOP-2771 Critical severity security vulnerabilty in commons-configuration 2.7
TINKERPOP-2796 High severity security vulnerability found in snakeyaml
TINKERPOP-2803 Incorrect count() with sample() in TinkerGraph
TINKERPOP-2809 High severity security vulnerability found in jackson databind
TINKERPOP-2815 Critical security vulnerability for apache commons-text
TINKERPOP-2816 Gherkin test issues for implementers
TINKERPOP-2817 Support java.lang.Byte in hadoop GraphSONRecordWriter/GraphSONRecordReader
TINKERPOP-2826 Critical security vulnerability in ivy
TINKERPOP-2836 Github actions do not run java driver integration tests
TINKERPOP-2840 Test Failures on NonDex
TINKERPOP-2843 Security vulnerabilities found in netty version 4.1.77
TINKERPOP-2849 Incorrect implementation for GraphTraversalSource.With in gremlin-go

Improvements

TINKERPOP-2471 Add logging to Gremlin.Net driver
TINKERPOP-2480 User agent for Gremlin drivers
TINKERPOP-2737 Dockerized Build and Test Environments
TINKERPOP-2772 Add Spark utility to load vertices as RDD
TINKERPOP-2779 Floating ConnectedComponent Feature Failures for GitHub Actions on windows
TINKERPOP-2785 Inability to Mock Returned Result Types in Gremlin-Go Driver
TINKERPOP-2792 Better exception when JavaTranslator finds a method but not the overload
TINKERPOP-2794 Allow cancellation of Gremlin.Net async methods
TINKERPOP-2808 Improve Compatibility on ARM machines
TINKERPOP-2813 Improve driver usability for cases where NoHostAvailableException is currently thrown
TINKERPOP-2814 Add a SSL handshake timeout configuration to the driver
TINKERPOP-2833 TestSupport loads files too slow
TINKERPOP-2834 CloneVertexProgram optimization on SparkGraphComputer
TINKERPOP-2842 Expand GremlinScriptChecker to include request id overrides

TinkerPop 3.5.4 (Release Date: July 18, 2022)

Added exception to Gremlin Server that is thrown when using a transaction on a non-transaction graph.
Exposed error message sent by the server as a property on GremlinServerError for gremlin-python
Allowed datetime() syntax to accept zone offset with colon separators and seconds.
Fixed a minor problem in the Gremlin parser where a GraphTraversalSource may not have been initialized.
Added getters to high and low properties in RangeLocalStep.
Added Pick traversal to the return from getGlobalChildren() for BranchStep.
Ensured Pick traversal was an integrated child.
Added GraphBinary serialization support to gremlin-javascript.
Improved startup time by removing unnecessary DNS lookup.
Bumped to logback 1.2.9.
Bumped to netty 4.1.77.
Fixed bug in submitAsync() in gremlin-python where the deprecated version was not returning its result.
Added missing ResponseStatusCodeEnum entries for 403, 429, 497, and 596 for .NET.
Added GraphBinary support in gremlin-python for short, bigdecimal and biginteger.
Fixed bug in PartitionStrategy where the use of AbstractLambdaTraversal caused an unexpected exception.
Fixed bug where close requests for sessions were improperly validating the request in the UnifiedChannelizer.
Deprecated and removed functionality of the connectOnStartup option in gremlin-javascript to resolve potential unhandledRejection and race conditions.
Ensured Graph instance was set between TraversalStrategy executions.
Fixed potential NullPointerException in gremlin-driver where initialization of a ConnectionPool would fail but not throw an exception due to centralized error check being satisfied by a different process.
Fixed a bug where the JavaScript client would hang indefinitely on traversals if the connection to the server was terminated.
Fix a javadoc comment in Cluster.Builder regarding maxInProcessPerConnection.
Added a getter for selectKeys in SelectStep

Bugs

TINKERPOP-2734 NullPointerException when calling Client chooseConnection()
TINKERPOP-2735 IllegalStateException: Unrecognized content of the 'gremlin' argument… on connection close
TINKERPOP-2736 PluginAcceptror interface no more available in 3.5.3+ but referred in documentation
TINKERPOP-2741 GraphMLWriter error message is not properly formatted
TINKERPOP-2751 Transaction: tx.commit() hangs up in javascript client-lib
TINKERPOP-2754 Javascript client hangs if the server restarts
TINKERPOP-2763 client.submitAsync returns None value
TINKERPOP-2768 BranchStep pickToken should be integrated when added as a child option

Improvements

TINKERPOP-2229 JavaScript GLV: Add GraphBinary Support
TINKERPOP-2631 GraphSON float serialization when ujson is used is imprecise
TINKERPOP-2693 Complete GraphBinary support in Python
TINKERPOP-2740 first request suspend more than 9s when using gremlin-java-driver
TINKERPOP-2748 Medium security vulnerability on netty-all and netty-codec
TINKERPOP-2762 getScopeKeys should respect the order of keys passed in Step
TINKERPOP-2764 AWS Neptune returns an inaccessible structured error response

TinkerPop 3.5.3 (Release Date: April 4, 2022)

Added support for using a readable stream when submitting scripts through the JavaScript driver which allows processing each batch of result sets as they come in, rather than waiting for the entire result set to complete before allowing processing.
Fixed issue with implicit conversion of Infinity number instances into BigDecimal.
Ensured that new properties are added before triggering the associated event.
Added support for WebSocket compression in the .NET driver. (Only available on .NET 6.)
Added Groovy Translator for .NET.
Bumped to jackson-databind 2.13.2.2.
Fixed bug in DefaultTraversal.clone() where the resulting Traversal copy could not be re-iterated.
Fixed bug in JavaTranslator that did not handle has() well where null was the first argument.
Renamed GremlinBaseVisitor to DefaultGremlinBaseVisitor in gremlin-core to prevent conflict with the generated GremlinBaseVisitor in gremlin-language.
Tracked transaction spawned connections and closed them when the parent connection was closed for gremlin-python.
Prevented unintentionally opening another transaction in TraversalOpProcessor` and SessionOpProcessor of Gremlin Server.
Fixed bug in Translator of gremlin-python around translation of Booleans.

Bugs

TINKERPOP-2694 Bug of TinkerGraph gremlin api "has()"
TINKERPOP-2706 Traversal clone() not resetting the close state
TINKERPOP-2712 PropertyChangedEvent is triggered before Property is actually changed
TINKERPOP-2717 Gremlin.NET : WebSocketConnection does not check for MessageType.Close, causing error InvalidOperationException: "Received data deserialized into null object message. Cannot operate on it."
TINKERPOP-2719 hasNext is called on TraverserIterator after transaction is committed
TINKERPOP-2726 Python’s GroovyTranslator translates boolean wrong

Improvements

TINKERPOP-2367 Gremlin Translators for .NET
TINKERPOP-2518 Enhance .NET gherkin framework to deal with more advanced assertions
TINKERPOP-2651 Update to .NET 6
TINKERPOP-2679 Update JavaScript driver to support processing messages as a stream
TINKERPOP-2682 Enable WebSocket compression in .NET by default
TINKERPOP-2707 Closing parent connection in python should close tx() connections
TINKERPOP-2711 Make gremlin-language optional as it brings in CDDL/GPL dependencies
TINKERPOP-2716 Enable eslint for gremlin-javascript project
TINKERPOP-2725 Traversal Strategy Mix Up In Gremlin-Python
TINKERPOP-2727 HasContainer should allow a null key
TINKERPOP-2728 jackson-databind high security issue identified

TinkerPop 3.5.2 (Release Date: January 10, 2022)

This release also includes changes from 3.4.13.

Added an AnonymizingTypeTranslator for use with GroovyTranslator which strips PII (anonymizes any String, Numeric, Date, Timestamp, or UUID data)
Added support for g.tx() in Python.
Added logging in in Python.
Added tx() syntax to gremlin-language.
Fixed shutdown cleanup issue in Python aiohttp transport layer.
Added a NoSugarTranslator translator to PythonTranslator which translates Gremlin queries to Python without syntactic sugar (ex g.V().limit(1) instead of g.V()[0:1])
Added support for g.Tx() in .NET.
Added support for with() constant options to io().
Changed GroovyTranslator to generate code more compatible to Java with Date and Timestamp.
Fixed bug in the processing of the io() step when constructing a Traversal from the grammar.
Added the ConnectedComponent tokens required to properly process the with() of the connectedComponent() step.
Fixed DotNetTranslator bugs where translations produced Gremlin that failed due to ambiguous step calls to has().
Fixed bug where RepeatUnrollStrategy, InlineFilterStrategy and MessagePassingReductionStrategy were all being applied more than necessary.
Modified grammar to accept the datetime() function so that Gremlin scripts have a way to natively construct a Date.
Ensured PathRetractionStrategy is applied after InlineFilterStrategy which prevents an error in traverser mapping in certain conditions.
Deprecated JsonBuilder serialization for GraphSON and Gryo.
Added ProductiveByStrategy to ensure consistency of by() modulator behaviors when child traversal arguments contained no elements.
Changed drivers to once again send the previously deprecated and removed "close" message for sessions.
Modified fold() to merge Map instances with addAll.
Allowed null string values in the Gremlin grammar.
Fixed support for SeedStrategy in the Gremlin Grammar.
Fixed bug in Translator of gremlin-javascript around array translation.
Fixed bugs in PythonTranslator, JavascriptTranslator and DotNetTranslator when translating TraversalStrategy objects to Javascript.
Prevented exception with hasLabel(null) and hasKey(null) and instead filter away traversers as these structural components can’t ever be null.
Improved handling of null when passed to P predicates.
Handled null for mathematical reducing operations of sum(), mean(), max() and min().
Allowed null values in Memory for GraphComputer.
Allowed null assignment in withSideEffect().
Allowed labelling of steps that emit a traverser carrying null.
Fixed bug in filtering for null property key arguments to valueMap(), elementMap(), properties() and values().
Modified grammar to allow a call to within() and without() with no arguments.
Fixed problems with inject(null) variations where null was the only value being submitted.
Fixed problem with GroovyTranslator and inject(null,null) which could be interpreted as the Groovy JDK extension inject(Object,Closure).
Fixed error where certain variants of inject() with null might not properly construct a traversal in .NET.
Prevented exception with hasValue(null) and allowed filtering as expected.
Refined DotNetTranslator to be more explicit with null arguments to ensure that the right overloads are called.
Created GremlinParser to construct Traversal objects from gremlin-language.
Added GremlinLangScriptEngine as a GremlinScriptEngine implementation that users the grammar and JavaTranslator to evaluate Gremlin.
Added getter method for bypassTraversal in AbstractLambdaTraversal.
Added support for custom GraphBinary types in .NET.
Removed some unnecessary exception wrapping around gremlin-driver errors now producing a more immediate view of the actual error cause.

Bugs

TINKERPOP-2569 Reconnect to server if Java driver fails to initialize
TINKERPOP-2585 Traversal failed for different strategies order
TINKERPOP-2589 XML External Entity (XXE) vulnerability
TINKERPOP-2597 NullPointerException while initializing connection pool
TINKERPOP-2598 within(null) NPE
TINKERPOP-2603 TinkerGraph sometimes could not query float values.
TINKERPOP-2609 HTTP returns serialization exceptions for the GraphTraversalSource
TINKERPOP-2621 toString for traversals such as within with empty array returns empty string as argument instead of brackets
TINKERPOP-2626 RangeGlobalStep closes traversal prematurely
TINKERPOP-2649 Unable to translate gremlin query to java
TINKERPOP-2658 Translator in gremlin-javascript has trouble with array arguments
TINKERPOP-2662 Unclosed client session and stacktrace pops up when cleanup is missed
TINKERPOP-2670 JavaDocs do not build when using JDK 11

Improvements

TINKERPOP-2504 Intermittently failing server/driver integration tests
TINKERPOP-2555 Support for remote transactions in Python
TINKERPOP-2556 Support remote transactions in .NET
TINKERPOP-2570 Support custom type in GraphBinary for .NET
TINKERPOP-2582 Construct traversals from gremlin-language
TINKERPOP-2583 Make gremlin-groovy processing optional in Gremlin Server
TINKERPOP-2591 Administrative adjustments to gremlint site
TINKERPOP-2592 Align the style guides
TINKERPOP-2596 datetime function
TINKERPOP-2605 Further enforce and refine null semantics
TINKERPOP-2615 Expand testing of path() with null values
TINKERPOP-2616 Provide better exceptions with SSL related failures (breaking)
TINKERPOP-2620 Clean up NullPointerExceptions related to null arguments on property related steps
TINKERPOP-2630 Clarify that a server cannot support Graphson1.0 over HTTP
TINKERPOP-2632 Netty 4.1.61 flagged with two high severity security violations
TINKERPOP-2637 Enhance logging in the Python
TINKERPOP-2646 Make .NET StreamExtensions public for GraphBinary
TINKERPOP-2656 Provide a no syntax sugar translator for python
TINKERPOP-2660 Bring back close message for drivers
TINKERPOP-2666 Create an anonymizing Translator for logging traversals without user data
TINKERPOP-2667 Allow fold() with addAll to work on Map
TINKERPOP-2668 Updating aiohttp requirements at germin-python due to vulnerability
TINKERPOP-2669 Netty 4.1.61 flagged with medium severity security violations
TINKERPOP-2671 Add tx() support to grammar

TinkerPop 3.5.1 (Release Date: July 19, 2021)

This release also includes changes from 3.4.12.

Added support for g.tx() in Javascript.
Fixed bug in Javascript error message related to validating anonymous traversal spawns.
Changed close of Python and Javascript connections to no longer send a "close message" as the server no longer acknowledges it as of 3.5.0.
Fixed bug where the Graph instance was not being assigned to child traversals.
Removed sending of deprecated session close message from Gremlin.Net driver.

Bugs

TINKERPOP-2358 Potential connection leak on client disposing
TINKERPOP-2554 Extracting step metrics from ProfileStep throws NPE if the step was not triggered
TINKERPOP-2565 GraphMLWriter does not check vertexLabelKey conflict
TINKERPOP-2566 Incomplete error message in bytecode step generation
TINKERPOP-2568 Graph instance not set for child traversals
TINKERPOP-2578 Set arguments to P within/without are wrapped in List
TINKERPOP-2579 EventStrategy doesn’t work with anonymous traversal
TINKERPOP-2580 Update the custom DSL documentation

Improvements

TINKERPOP-2548 Add getter for indexer used in IndexStep
TINKERPOP-2551 Setup scripts to publish Gremint to npm
TINKERPOP-2557 Support remote transactions in Javascript
TINKERPOP-2559 Stop sending the close message for .NET
TINKERPOP-2560 Stop sending close message for Python
TINKERPOP-2561 Stop sending close message in Javascript
TINKERPOP-2576 Setup automatic updates via Dependabot for Gremlin.NET
TINKERPOP-2577 Remove unused test coverage dependencies from Gremlin.NET

TinkerPop 3.5.0 (Release Date: May 3, 2021)

This release also includes changes from 3.4.11.

Changed transport implementation to use AIOHTTP instead of Tornado for gremlin-python.
Added max_content_length and unit test for it in gremlin-python.
Removed compression_option support for transport in gremlin-python.
Fixed event loop issues and added unit test for it in gremlin-python.
Fixed DriverRemoteConnection multithreading issues and added unit test for it in gremlin-python.
Fixed heartbeat timeout issues and tested with local server manually for gremlin-python.
Fixed build errors emitted for gremlin-python (asyncio task destroyed but is pending error).
Added gremlin-language module.
Allowed the possibility for the propagation of null as a Traverser in Gremlin.
Added a fully shaded version of gremlin-driver.
Exposed websocket connection status in JavaScript driver.
Fixed a bug where spark-gremlin was not re-attaching properties when using dedup().
Fixed a bug in WsAndHttpChannelizer pipeline configuration where failed object aggregation could not write back HTTP responses.
Ensured better consistency of the use of null as arguments to mutation steps.
Added a ResponseStatusCode to indicate that a client should retry its request.
Added TemporaryException interface to indicate that a transaction can be retried.
Prevented TraversalStrategy instances from being added more than once, where the new instance replaces the old.
Improved error message for addE() when the from() or to() does not resolve to a Vertex.
Improved error message for addE() when cardinality is specified on property() assignments.
Allowed property(T.label,Object) to be used if no value was supplied to addV(String).
Dropped support for .NET Standard 1.3 in Gremlin.Net. Only .NET Standard 2.0 is supported starting with this version.
Added GraphBinary support for .NET.
Added UnifiedChannelizer which exposes HTTP and Websockets connections and processes both sessionless and in-session requests with the same gremlinPool.
Bounded the gremlinPool in Gremlin Server to enforce rate limiting which will then produce a TOO_MANY_REQUESTS response status code.
Switched from Newtonsoft.Json to System.Text.Json as the JSON library for Gremlin.Net.
Allowed additional arguments to Client.submit() in Javascript driver to enable setting of parameters like scriptEvaluationTimeout.
Gremlin.Net driver no longer supports skipping deserialization by default. Users can however create their own IMessageSerializer if they need this functionality.
Supported deserialization of dict and list as a key in a dict for Python.
Changed the aliased Client to proxy close() methods to its underlying client.
Added support for remote g.tx() usage.
Added support for bytecode-based sessions.
Added a Graph.Feature for supportsNullPropertyValues.
Modified TokenTraversal to support Property thus by(key) and by(value) can now apply to Edge and meta-properties.
Added SeedStrategy to allow deterministic behavior for coin(), sample() and Order.shuffle.
Added Grouping step interface.
Added TraversalParent.replaceTraversal() which can replace a direct child traversal.
Added ByModulatorOptimizationStrategy which replaces certain standard traversals w/ optimized traversals (e.g. TokenTraversal).
Improved IdentityRemovalStrategy by accounting for EndStep situations.
Added IdentityRemovalStrategy to the standard list of TraversalStrategies.
Modified PathRetractionStrategy to leave labels more often with match() cases to return more consistent results.
Refactored MapStep to move its logic to ScalarMapStep so that the old behavior could be preserved while allow other implementations to have more flexibility.
Modified TinkerGraph to support null property values and can be configured to disable that feature.
Modified null handling in mutations to be consistent for a new Vertex as well as update to an existing one.
Enforced use of anonymous child traversals.
Removed support for Python 2.x in gremlinpython.
Upgraded to Apache Commons Configuration2.
Renamed StoreStep to AggregateLocalStep.
Renamed AggregateStep to AggregateGlobalStep.
Renamed SERVER_ERROR_SCRIPT_EVALUATION to SERVER_ERROR_EVALUATION given that this response code applies to remote traversals as well as scripts.
Refactored TraversalStrategies to implement Iterable.
Refactored Traversal semantics to always expect EmptyStep as a parent if it is meant to be the root Traversal.
Configured GraphBinary as the default binary serialization format for the Java Driver.
Configured GraphSON 3.0 as the default text serialization format when no serializer can be determined.
Configured GraphSON 3.0 as the default setting for the GraphSONMapper.
Added JavascriptTranslator for Java.
Added DotNetTranslator for Java.
Added Groovy Translator for Python.
Fixed bug in PythonTranslator for processing TraversalStrategy instances in GraphBinary.
Fixed bug in bytecode Bindings where calling of() prior to calling a child traversal in the same parent would cause the initial binding to be lost.
Migrated from Tornado to AIOHTTP for gremlinpython.
Bumped to Neo4j 3.4.11.
Bumped to Spark 3.0.0.
Bumped to Jackson 2.11.x.
Supported build for Java 11.
Added MessageSerializer.getMapper() to return the underlying object that handles serialization for a particular implementation.
Added a parameterized TypeTranslator for use with GroovyTranslator that should produce more cache hits.
Added support for TextP in Neo4j using its string search functions.
Added a kerberos KDC to the docker container for testing GLV’s.
Added kerberos authentication to Gremlin-Python.
Added audit logging to bytecode-based traversals.
Changed TraversalStrategy application methodology to apply each strategy in turn to each level of the traversal hierarchy starting from root down to children.
Added a VertexProgramRestrictionStrategy.
Prevented more than one Client from connecting to the same Gremlin Server session.
Changed the Groovy to an optional dependency in gremlin-driver.
Added support for configuring an Authorizer implementation to Gremlin Server, allowing for authorization of individual gremlin requests.
Added gremlint module to house the Gremlin query formatting JavaScript library powering gremlint.com.
Removed internal functionality for the session close message in Gremlin Server - the message is accepted but ignored if sent.
Removed Property.Exceptions.propertyValueCanNotBeNull exception type as null now has meaning in Gremlin.
Removed the "experimental" support for multi/meta-properties in Neo4j.
Removed Gryo serialization configurations from Gremlin Server sample configurations and default configurations.
Removed previously deprecated custom keep-alive functionality in the Java driver.
Removed previously deprecated BytecodeUtil.
Removed previously deprecated Cluster.maxWaitForSessionClose configuration option.
Removed previously deprecated TraversalStrategies.applyStrategies().
Removed previously deprecated scriptEvaluationTimeout.
Removed previously deprecated NioChannelizer and related classes.
Removed previously deprecated remote traversal side-effects and related infrastructure.
Removed previously deprecated Serializers.DEFAULT_RESULT_SERIALIZER and Serializers.DEFAULT_REQUEST_SERIALIZER.
Removed previously deprecated decr and incr from Order.
Removed previously deprecated TraversalSource.withRemote().
Removed previously deprecated ResponseHandlerContext infrastructure.
Removed previously deprecated VertexProgram related infrastructure.
Removed previously deprecated SSL settings: keyCertChainFile, keyFile, keyPassword and trustCertChainFile and related infrastructure.
Removed previously deprecated PropertyMapStep constructor and isIncludeTokens.
Removed previously deprecated StarGraph.builder() and StarGraph.Builder.create().
Removed previously deprecated AbstractOpProcessor.generateMetaData(ChannelHandlerContext, RequestMessage, ResponseStatusCode, Iterator)
Removed previously deprecated BulkDumperVertexProgram and BulkLoaderVertexProgram.

Bugs

TINKERPOP-1619 TinkerGraphComputer worker count affects OptionalStep query results
TINKERPOP-2107 Spark fails to reattach properties
TINKERPOP-2157 SparkStarBarrierInterceptor injects (Byte) 0
TINKERPOP-2159 EventStrategy doesn’t handle multi-valued properties
TINKERPOP-2175 Executor thread is not returned on channel close
TINKERPOP-2185 Use commons-configuration2 instead of commons-configuration (breaking)
TINKERPOP-2192 Gremlin.Net.Driver.Connection.Parse throws a NullReferenceException
TINKERPOP-2224 Detect and fix resource leak
TINKERPOP-2230 match() step unexpected behaviours
TINKERPOP-2232 RemoteStrategy does not call parent class TraversalStrategy init
TINKERPOP-2238 Fix remaining iterator leaks marked by @IgnoreIteratorLeak
TINKERPOP-2241 Client exception don’t match Server exception when server throw StackOverflowError
TINKERPOP-2248 Instability of driver for blocked requests
TINKERPOP-2257 transaction itty may still be visited after commit
TINKERPOP-2264 Gremlin Python should deserialize g:Date to UTC
TINKERPOP-2266 Keep alive not started at connection creation
TINKERPOP-2274 Test of TinkerGraph Gremlin fail on Windows and non EN locale
TINKERPOP-2276 No constructor for remote connection in DSL generated traversal source
TINKERPOP-2283 GraphStep’s ids null exception
TINKERPOP-2285 Error object is unreachable
TINKERPOP-2288 Get ConnectionPoolBusyException and then ServerUnavailableExceptions
TINKERPOP-2289 Use address instead of hostname for connection
TINKERPOP-2290 Javascript GLV connection refused error handling
TINKERPOP-2291 TraversalExplanation deserialization in GraphSON
TINKERPOP-2298 Bytecode.java flattenArguments throw exception when null
TINKERPOP-2303 GremlinDsl generate addV instead of addE
TINKERPOP-2318 Edge properties dedup() not work with spark-gremlin (breaking)
TINKERPOP-2337 In upgrade guide for 3.4.2, the option RemoteConnection.PER_REQUEST_TIMEOUT does not exist
TINKERPOP-2338 drop() not removing all edge/meta properties
TINKERPOP-2341 GremlinClientExtensions.SubmitAsync hangs as it tries to dispose connection
TINKERPOP-2345 NullPointerException when Map key is not found for math()
TINKERPOP-2347 Remove invalid service descriptors from gremlin-shaded
TINKERPOP-2350 clone() is not deep copying Traversal internals
TINKERPOP-2351 Local Map ordering of keys can generate cast errors
TINKERPOP-2352 Gremlin Python driver default pool size makes Gremlin keep-alive difficult
TINKERPOP-2353 Error while Shutting Down Gremlin Server
TINKERPOP-2360 failed to deserializer int32 when gremlin-python submit bytecode with a big int value
TINKERPOP-2364 Injected ProfileStep should not be displayed in child traversals
TINKERPOP-2365 LazyBarrierStrategy adds a NoOpBarrierStep when profile() is present
TINKERPOP-2368 JAVA_OPTIONS are not properly expanded in gremlin-console
TINKERPOP-2369 Connections in ConnectionPool are not replaced in background when underlying channel is closed
TINKERPOP-2374 SaslAndHttpBasicAuthenticationHandler can’t extract authorization
TINKERPOP-2383 has(T,Traversal) does not return results
TINKERPOP-2384 Inject and withSideEffect causing different outcomes in order step
TINKERPOP-2388 gremlinpython: Can’t close DriverRemoteConnection
TINKERPOP-2403 Gremlin javascript Translator does not handle child traversals
TINKERPOP-2405 gremlinpython: traversal hangs when the connection is established but the servers stops responding later
TINKERPOP-2408 Iterator leak in HasContainer
TINKERPOP-2409 js: DriverRemoteConnection never times out if server uri not available.
TINKERPOP-2410 Free up server threads when client is closed
TINKERPOP-2425 Server closes HTTP connection for keepAlive as true
TINKERPOP-2432 Generate correct toString() representation of bytecode in Javascript
TINKERPOP-2433 typo in javadocs match() Type Parameters
TINKERPOP-2435 Gremlin Python sugar syntax for values() can lead to unexpected problems
TINKERPOP-2437 gremlin-driver hangs if ResultSet.statusAttributes().get() is called when the request throws
TINKERPOP-2439 P and TextP toString() is broken
TINKERPOP-2458 Bytecode Bindings lost when followed by a child traversal
TINKERPOP-2465 TestHelper.generateTempFileFromResource file handling is invalid on windows
TINKERPOP-2475 Barrier step touches one more element of next loop
TINKERPOP-2478 Console byte code translator has issues with "new Date()"
TINKERPOP-2496 GremlinDslProcessor fails when SocialTraversalSourceDsl overrides close
TINKERPOP-2505 Gremlin Python Client Query Times out at 30 seconds instead of the server timeout
TINKERPOP-2512 Duplicate jars in classpath when running gremlin-server.sh
TINKERPOP-2513 Generics insufficiently strict on property()
TINKERPOP-2514 Java client driver requests with same request ids hang
TINKERPOP-2516 Property folding has trouble with coalesce
TINKERPOP-2529 Global dedup() in reducing by() of group() detaches elements for OLTP
TINKERPOP-2531 Gremlin .NET driver ConnectionPool can remain without connections if server is down for 1-2 minutes

Improvements

TINKERPOP-709 Consider Bounding Gremlin Pool Queue Size
TINKERPOP-1084 Branch option tokens should be allowed to be traversals.
TINKERPOP-1553 Deprecate store() in favor of aggregate(Scope)
TINKERPOP-1568 Change strategy application order (breaking)
TINKERPOP-1641 Kerberos authentication for gremlin-python
TINKERPOP-1682 by-modulator optimization strategy
TINKERPOP-1733 hasKey, hasValues should work on Element and Property
TINKERPOP-1810 Add Lambda.binaryOperator and Lambda.unaryOperator
TINKERPOP-1838 Python sample script
TINKERPOP-1886 Gremlin Python driver to periodically issue ping / heartbeat to gremlin server
TINKERPOP-1921 Support hasNext terminal step in GLVs
TINKERPOP-1994 LazyBarrierStrategy fully responsible for barrier() additions
TINKERPOP-2001 Support lambdas in Javascript
TINKERPOP-2014 Allow an ability to specify seeding for random methods such as coin, sample and Order.shuffle
TINKERPOP-2020 Support withComputer() for javascript
TINKERPOP-2046 Gremlin-Python: Support custom request headers in WebSocket request
TINKERPOP-2054 Support TraversalStrategy specification in gremlin-javascript
TINKERPOP-2076 Build with Java 11
TINKERPOP-2080 Remove deprecated TraversalSource.withRemote() (breaking)
TINKERPOP-2099 Property setting with null has different behavior between add and update (breaking)
TINKERPOP-2133 Use neo4j index lookup in Neo4jGraphStep with HasContainers containing TextP predicates
TINKERPOP-2168 GraphSON: P deserialization should be optimized
TINKERPOP-2213 Replace scriptEvaluationTimeout in favor of something more suitable to bytecode
TINKERPOP-2215 Better exception message for connection problems
TINKERPOP-2223 Update jackson databind to 2.9.9
TINKERPOP-2231 Remove deprecated bulk dumping/loading VertexPrograms (breaking)
TINKERPOP-2233 Remove deprecated Order decr/incr (breaking)
TINKERPOP-2235 Better handle the concept of null in traversals (breaking)
TINKERPOP-2236 Improve error messaging for TinkerGraph IdManagers that fail on conversions
TINKERPOP-2237 Prevent error when closing sessions that don’t exist (breaking)
TINKERPOP-2239 Remove previously deprecated SSL configuration options (breaking)
TINKERPOP-2242 Bump to netty 4.1.36
TINKERPOP-2243 Add user-agent to RequestOptions
TINKERPOP-2245 Consolidate the executor for bytecode & string based client
TINKERPOP-2246 Consolidate the error propagation to the client
TINKERPOP-2250 Support toString serialization in GraphBinary
TINKERPOP-2251 Remove deprecated VertexProgram-related methods (breaking)
TINKERPOP-2252 A meaningful way to support session based byteCode interaction through gremlin-driver
TINKERPOP-2254 Rename AggregateStep and StoreStep given aggregate(Scope,String) (breaking)
TINKERPOP-2256 processAllStarts of AggregateStep should only be called when barrier is empty
TINKERPOP-2259 Default Java based driver and server operations to GraphBinary and remove Gryo (breaking)
TINKERPOP-2260 Update jackson databind 2.9.9.1
TINKERPOP-2262 Improve Netty protocol handling
TINKERPOP-2265 Deprecate Traversal.getSideEffects() functionality for remoting purposes
TINKERPOP-2269 Remove remote side-effect related infrastructure (breaking)
TINKERPOP-2270 Deprecate multi/metaproperty support in Neo4j
TINKERPOP-2271 Add console preference to control server-originated warning display
TINKERPOP-2272 Rename steps and tokens that conflict with standard python functions
TINKERPOP-2273 Remove deprecated ResponseHandlerContext infrastructure (breaking)
TINKERPOP-2277 Python sdk postpone the timing to create transport
TINKERPOP-2279 GraphBinary support in Python
TINKERPOP-2280 Prevent use of T values as property key overloads
TINKERPOP-2284 Make it easier to return more structure of graph elements
TINKERPOP-2295 Remove deprecated scriptEvaluationTimeout (breaking)
TINKERPOP-2296 Per query timeout not working from Python
TINKERPOP-2302 Add isOnGraphComputer() field accessor to ElementMapStep
TINKERPOP-2307 Add better error message for badly configured Channelizer
TINKERPOP-2310 Reduce Traversal.isRoot() to a check of EmptyStep (breaking)
TINKERPOP-2311 TraversalStrategies implementing Iterable (breaking)
TINKERPOP-2312 Empty keys to group() should group to null
TINKERPOP-2314 Employ by(String) for Map when possible and improve errors around incorrect types
TINKERPOP-2315 Implement some form of clone() or reset() for Traversal in GLVs
TINKERPOP-2317 Remove Python 2 support (breaking)
TINKERPOP-2320 [SECURITY] XMLInputFactory initialization in GraphMLReader introduces
TINKERPOP-2325 Generate traversals that will better yield index lookups with SPARQL
TINKERPOP-2327 Remove deprecated NIO protocol support (breaking)
TINKERPOP-2328 Do not close all connections if just one has became closed
TINKERPOP-2335 Drop support for older GLV runtimes
TINKERPOP-2336 Allow close of channel without having to wait for server
TINKERPOP-2349 Switch from Newtonsoft.Json to System.Text.Json (breaking)
TINKERPOP-2354 Document recommendation to reuse graph traversal source
TINKERPOP-2356 Bump to Jackson 2.10.x
TINKERPOP-2357 Add a command to clear the Gremlin Console screen
TINKERPOP-2361 Prevent using GraphTraversalSource spawned traversals as children (breaking)
TINKERPOP-2371 Add possibility to import constants with ImportGremlinPlugin
TINKERPOP-2376 Probability distribution controlled by weight when using sample step
TINKERPOP-2377 Investigate intermittent .NET GLV test failures
TINKERPOP-2389 Authorization support in TinkerPop
TINKERPOP-2391 Drop GLV Templating System
TINKERPOP-2392 Improve module level documentation for GLVs
TINKERPOP-2394 Unable to use __ class of a custom DSL when passing a script even if this class is imported (breaking)
TINKERPOP-2395 Gremlin Python doesn’t support list as keys in groupCount
TINKERPOP-2396 TraverserSet should be extendable for GraphDB provider
TINKERPOP-2397 Don’t create the default Gyro serializer if the caller specifies a different one
TINKERPOP-2401 Upgrade Jackson-databind to 2.11.x
TINKERPOP-2406 Delegate processing from event loop to worker threads
TINKERPOP-2407 Support deserialization of a dict that has a dict as a key
TINKERPOP-2412 Add missing query tests
TINKERPOP-2413 Prefer withEmbedded() to withGraph() on AnonymousTraversalSource
TINKERPOP-2415 Avoid unnecessary detached objects if not required
TINKERPOP-2416 MultiIterator should implement AutoCloseable
TINKERPOP-2418 Store authenticated user on server pipeline
TINKERPOP-2420 Support per query request options in .NET
TINKERPOP-2421 Support per query options in javascript
TINKERPOP-2426 Use Netty’s WebSocketClientProtocolHandler
TINKERPOP-2427 Simplify Netty reference counting
TINKERPOP-2430 Looping Recipies
TINKERPOP-2431 Operating on Dropped Elements Recipes
TINKERPOP-2436 The gremlin server starts even if all graphs instantiation has failed
TINKERPOP-2438 Provide a way for scripts to respect with() specification of timeout
TINKERPOP-2440 Simplify driver by delegating keepAlive logic to Netty
TINKERPOP-2441 Add compression to WebSocket frames sent from client
TINKERPOP-2442 Make Translators that work in Java part of gremlin-core
TINKERPOP-2443 Improve testing of Translator instances for non-JVM languages with focus on Python as a model
TINKERPOP-2445 Speed up client initialization (breaking)
TINKERPOP-2446 Add Recipe for Optional Looping
TINKERPOP-2447 Improve handling of StackOverflowError for long traversals
TINKERPOP-2451 JavascriptTranslator for Java
TINKERPOP-2452 DotNetTranslator for Java
TINKERPOP-2453 Add WebSocket compression to gremlin-python
TINKERPOP-2455 Remove deprecated custom keep-alive functionality in the Java driver Channelizer (breaking)
TINKERPOP-2457 Add a max_content_length parameter to DriverRemoteConnection in the Python client
TINKERPOP-2460 Change groovy to provided scope in gremlin-driver (breaking)
TINKERPOP-2461 Align CoreImports with GroovyTranslator
TINKERPOP-2462 Duplicated BytecodeUtil and BytecodeHelper classes
TINKERPOP-2466 Improve syntax for Groovy scripts that use withStrategies()
TINKERPOP-2468 Stabilize shouldProcessSessionRequestsInOrder() test
TINKERPOP-2469 KrbException - Principal does not exist in test
TINKERPOP-2470 Bump gremlinpython to tornado 6.x
TINKERPOP-2472 GraphBinary support in .NET
TINKERPOP-2473 Prevent TraversalStrategy instances of the same type to be added to a TraversalSource
TINKERPOP-2474 withSack() Groovy translation output could be simplified
TINKERPOP-2476 Provide fully shaded version of Java driver
TINKERPOP-2479 Provide a way to set a custom GraphSONMapper for :bytecode command
TINKERPOP-2481 IdentityRemovalStrategy not installed (breaking)
TINKERPOP-2482 Rename wsConnectionTimeout to connectionSetupTimeout
TINKERPOP-2484 Python IOLoop close errors
TINKERPOP-2485 Invalid http tests with ?gremlin=1-1
TINKERPOP-2494 Document Translator parameter extraction functionality
TINKERPOP-2499 PathRetractionStrategy returns inconsistent results when match() is not detected as the final step (breaking)
TINKERPOP-2500 Add none() step for all GLVs
TINKERPOP-2506 Expose client WebSocket connection status
TINKERPOP-2517 Introduce a retry status code to the server protocol
TINKERPOP-2527 Add a GroovyTranslator equivalent method to the Python client
TINKERPOP-2530 Transfer OyvindSabo/gremlint and OyvindSabo/gremlint.com to apache/tinkerpop/gremlint
TINKERPOP-2532 MaxBarrierSize of NoOpBarrierStep should be accessible
TINKERPOP-2533 Develop a grammar for Gremlin
TINKERPOP-2535 Netty 4.1.52 flagged as medium security violation
TINKERPOP-2537 Support bytecode based requests in sessions and remote tx()
TINKERPOP-2544 Modify site publishing scripts to include gremlint
TINKERPOP-2546 Change transport layer to use AIOHTTP instead of Tornado
TINKERPOP-2547 Provide an option to supply a callback before handshake submission
TINKERPOP-2550 Deadlock on Client initialization

TinkerPop 3.4.0 (Avant-Gremlin Construction #3 for Theremin and Flowers)

TinkerPop 3.4.13 (Release Date: January 10, 2022)

Fixed RangeGlobalStep which was prematurely closing the iterator.
Added explicit state to DefaultTraversal to track whether or not it was fully iterated and closed to ensure it released resources properly.
Prevented XML External Entity (XXE) style attacks via GraphMLReader by disabling DTD and external entities by default.
Improved error message for failed serialization for HTTP-based requests.
Fixed a NullPointerException that could occur during a failed Connection initialization due to uninstantiated AtomicInteger.
Minor changes to the initialization of Java driver Cluster and Client such that hosts are marked as available only after successfully initializing connection pools.
NoHostAvailableException now contains a cause for the failure.
Bumped to Netty 4.1.72.
Added user-friendly message in Gremlin console for unavailable hosts upon initiation and fixed possible leak in RemoteCommand.groovy upon RemoteException.

Bugs

TINKERPOP-2569 Reconnect to server if Java driver fails to initialize
TINKERPOP-2589 XML External Entity (XXE) vulnerability
TINKERPOP-2597 NullPointerException while initializing connection pool
TINKERPOP-2603 TinkerGraph sometimes could not query float values.
TINKERPOP-2609 HTTP returns serialization exceptions for the GraphTraversalSource
TINKERPOP-2626 RangeGlobalStep closes traversal prematurely

Improvements

TINKERPOP-2504 Intermittently failing server/driver integration tests
TINKERPOP-2616 Provide better exceptions with SSL related failures (breaking)
TINKERPOP-2630 Clarify that a server cannot support Graphson1.0 over HTTP
TINKERPOP-2632 Netty 4.1.61 flagged with two high severity security violations
TINKERPOP-2669 Netty 4.1.61 flagged with medium severity security violations

TinkerPop 3.4.12 (Release Date: July 19, 2021)

Coerced single set arguments to P.within and P.without to list in Python which serializes to a more expected form for P instances.
Fixed bug in the vertexLabelKey validation for GraphMLWriter which was inadvertently validating the edgeLabelKey.
Changed IndexStep to make it easier for providers to determine the type of indexer being used.
Allowed Javascript Translator to take Bytecode or a Traversal.
Addressed CVE-2021-32640 for gremlin-javascript.
Allowed construction of DriverRemoteConnection in .NET to use host and port specification similar to Java syntax.
Defaulted DriverRemoteConnection to "g" if it the TraversalSource binding isn’t supplied in Python.
Initialized metrics in ProfileStep even if the step hasn’t iterated.

Bugs

TINKERPOP-2358 Potential connection leak on client disposing
TINKERPOP-2554 Extracting step metrics from ProfileStep throws NPE if the step was not triggered
TINKERPOP-2565 GraphMLWriter does not check vertexLabelKey conflict
TINKERPOP-2578 Set arguments to P within/without are wrapped in List
TINKERPOP-2580 Update the custom DSL documentation

Improvements

TINKERPOP-2548 Add getter for indexer used in IndexStep
TINKERPOP-2577 Remove unused test coverage dependencies from Gremlin.NET

TinkerPop 3.4.11 (Release Date: May 3, 2021)

Prevented Java driver from sending multiple request messages with the same identifier.
Improved error message for property(T,Object) when mutating graph elements.
Added method caching for GraphSON 3.0 deserialization of P and TextP instances.
Allowed setting ssl_options for gremlin-python.
Fixed bug with global dedup() when used in reducing by() of group().
Fixed bug with Javascript Groovy Translator when generating Gremlin with multiple embedded traversals.
Modified Gremlin Server Settings to be more extensible allowing for custom options with the YAML parser.
Fixed toString() representation of P when string values are present in Javascript.
Exposed barrier size with getter for NoOpBarrierStep.
Bumped to Netty 4.1.61.
Added max_content_length as a Python driver setting.
Fixed bug in Java Client initialization, reconnect and shutdown where certain thread pool configurations might produce a deadlock.
Ensured that barrier() additions by strategies were controlled solely by LazyBarrierStrategy.
Fixed NullPointerException in ResponseMessage deserialization for GraphSON.
Enabled the Gremlin.Net driver to repair its connection pool after the server was temporarily unavailable.
Added the ability to supply a HandshakeInterceptor to a Cluster which will provide access to the initial HTTP request that establishes the websocket.
Fixed a possible leakage of connections in the Gremlin.NET driver that could happen if Dispose() was called while the pool was creating connections.

Bugs

TINKERPOP-2512 Duplicate jars in classpath when running gremlin-server.sh
TINKERPOP-2514 Java client driver requests with same request ids hang
TINKERPOP-2516 Property folding has trouble with coalesce
TINKERPOP-2529 Global dedup() in reducing by() of group() detaches elements for OLTP
TINKERPOP-2531 Gremlin .NET driver ConnectionPool can remain without connections if server is down for 1-2 minutes

Improvements

TINKERPOP-1994 LazyBarrierStrategy fully responsible for barrier() additions
TINKERPOP-2168 GraphSON: P deserialization should be optimized
TINKERPOP-2457 Add a max_content_length parameter to DriverRemoteConnection in the Python client
TINKERPOP-2532 MaxBarrierSize of NoOpBarrierStep should be accessible
TINKERPOP-2535 Netty 4.1.52 flagged as medium security violation
TINKERPOP-2547 Provide an option to supply a callback before handshake submission
TINKERPOP-2550 Deadlock on Client initialization

TinkerPop 3.4.10 (Release Date: January 18, 2021)

Added GremlinScriptChecker to provide a way to extract properties of scripts before doing an actual eval().
Added none() step for all language variants.
Fixed bug in PythonTranslator which was improperly translating Lambda scripts.
Fixed bug in GremlinDslProcessor where certain return types in TraversalSource definitions were not generating code that would compile.
Changed the default read and write timeout values for the TornadoTransport to None to disable it.
Bumped to Groovy 2.5.14.

Bugs

TINKERPOP-2496 GremlinDslProcessor fails when SocialTraversalSourceDsl overrides close
TINKERPOP-2505 Gremlin Python Client Query Times out at 30 seconds instead of the server timeout

Improvements

TINKERPOP-2447 Improve handling of StackOverflowError for long traversals
TINKERPOP-2485 Invalid http tests with ?gremlin=1-1
TINKERPOP-2500 Add none() step for all GLVs

TinkerPop 3.4.9 (Release Date: December 7, 2020)

Modified the text of profile() output to hide step instances injected for purpose of collecting metrics.
Bumped to Jackson 2.11.x.
Bumped Netty 4.1.52.
Added lambda support for gremlin-javascript.
Provided a more concise syntax for constructing strategies in Groovy.
Aligned CoreImports with GroovyTranslator to generate more succinct syntax.
Improved gremlin-groovy understanding of withSack() overloads to avoid forced casts.
Moved Translator instances to gremlin-core.
Prevented barriers from over-reaching their limits by one.
Added CheckedGraphManager to prevent Gremlin Server from starting if there are no graphs configured.
Fixed bug in bytecode Bindings where calling of() prior to calling a child traversal in the same parent would cause the initial binding to be lost.
Established a default read and write timeout for the TornadoTransport in Python, allowing it to be configurable.
Delegated handling of erroneous response to the worker thread pool instead of event loop thread pool in Java Driver.
Removed Connection from Connection Pool when server closes a connection with no pending requests in Java Driver.
Improved initialization time of Java Driver if the default serializer is replaced.
Deprecated withGraph() in favor of withEmbedded() on AnonymousTraversalSource.
Added support for per-request level configurations, like timeouts, in .NET, Python and Javascript.
Fixed bug in Javascript Translator that wasn’t handling child traversals well.
Prevented Gremlin Python sugar from being confused by Python magic methods.
Allowed Gremlin Python sugar calls from anonymous context.
Implemented AutoCloseable on MultiIterator.
Fixed an iterator leak in HasContainer.
Fixed bug in :bytecode command preventing translations with whitespace from working properly.
Added reset and config options to the :bytecode command to allow for greater customization options.
Added GraphSON extension module and the TinkerIoRegistry to the default GraphSONMapper configuration used by the :bytecode command.
Added GremlinASTChecker to provide a way to extract properties of scripts before doing an actual eval().
Avoided creating unnecessary detached objects in JVM.
Added support for TraversalStrategy usage in Javascript.
Added Traversal.getTraverserSetSupplier() to allow providers to supply their own TraverserSet instances.
Release server threads waiting on connection if the connection is dead.
Fixed bug where server closes HTTP connection on request error even if keep alive is set to true.
Deprecated driver Channelizer keep-alive related methods.
Delegate handling of WebSocket handshake to Netty instead of custom code in Java Driver.
Delegate detection of idle connection to Netty instead of custom keep alive logic for WebSocketChannelizer.
Added support for WebSocket frame compression extension ( [RFC7692](https://tools.ietf.org/html/rfc7692) ) for WebSocketChannelizer in Java/Python driver.
Added server support for WebSocket compression extension ( [RFC7692](https://tools.ietf.org/html/rfc7692) ).
Fixed bug with Bytecode serialization when Bytecode.toString() is used in Javascript.
Fixed "toString" for P and TextP to produce valid script representation from bytecode glv steps containing a string predicate in Javascript.
Fixed a bug which could cause Java driver to hang when using ResultSet.statusAttributes()
Added a listener to javascript’s DriverRemoteConnection to find note errors from websocket connection setup.
Fixed bug with ReservedVerificationStrategy.getConfiguration() which was omitting the reserved keys value.
Changed all configuration keys on AbstractWarningVerificationStrategy implementations to public.
Deprecated BytecodeUtil and merged its functionality to the existing BytecodeHelper.
Added configuring implementation in HasStep
Remove static initialization for GraphSONMessageSerializerV1d0 and GraphSONMessageSerializerV1d0 in Java driver.
Connections to the server in a connection pool are created in parallel instead of serially in Java Driver.
Connection pools for multiple endpoints are created in parallel instead of serially in Java Driver.
Introduced new HostNotAvailable exception to represent cases when no server with active connection is available.
Don’t wait for new requests during shutdown of event loop group in Java Driver.

Bugs

TINKERPOP-2364 Injected ProfileStep should not be displayed in child traversals
TINKERPOP-2369 Connections in ConnectionPool are not replaced in background when underlying channel is closed
TINKERPOP-2403 Gremlin javascript Translator does not handle child traversals
TINKERPOP-2405 gremlinpython: traversal hangs when the connection is established but the servers stops responding later
TINKERPOP-2408 Iterator leak in HasContainer
TINKERPOP-2409 js: DriverRemoteConnection never times out if server uri not available.
TINKERPOP-2410 Free up server threads when client is closed
TINKERPOP-2425 Server closes HTTP connection for keepAlive as true
TINKERPOP-2432 Generate correct toString() representation of bytecode in Javascript
TINKERPOP-2433 typo in javadocs match() Type Parameters
TINKERPOP-2435 Gremlin Python sugar syntax for values() can lead to unexpected problems
TINKERPOP-2437 gremlin-driver hangs if ResultSet.statusAttributes().get() is called when the request throws
TINKERPOP-2439 P and TextP toString() is broken
TINKERPOP-2458 Bytecode Bindings lost when followed by a child traversal
TINKERPOP-2465 TestHelper.generateTempFileFromResource file handling is invalid on windows
TINKERPOP-2475 Barrier step touches one more element of next loop
TINKERPOP-2478 Console byte code translator has issues with "new Date()"

Improvements

TINKERPOP-2001 Support lambdas in Javascript
TINKERPOP-2054 Support TraversalStrategy specification in gremlin-javascript
TINKERPOP-2296 Per query timeout not working from Python
TINKERPOP-2392 Improve module level documentation for GLVs
TINKERPOP-2396 TraverserSet should be extendable for GraphDB provider
TINKERPOP-2397 Don’t create the default Gyro serializer if the caller specifies a different one
TINKERPOP-2401 Upgrade Jackson-databind to 2.11.x
TINKERPOP-2406 Delegate processing from event loop to worker threads
TINKERPOP-2412 Add missing query tests
TINKERPOP-2413 Prefer withEmbedded() to withGraph() on AnonymousTraversalSource
TINKERPOP-2415 Avoid unnecessary detached objects if not required
TINKERPOP-2416 MultiIterator should implement AutoCloseable
TINKERPOP-2420 Support per query request options in .NET
TINKERPOP-2421 Support per query options in javascript
TINKERPOP-2426 Use Netty’s WebSocketClientProtocolHandler
TINKERPOP-2427 Simplify Netty reference counting
TINKERPOP-2430 Looping Recipies
TINKERPOP-2431 Operating on Dropped Elements Recipes
TINKERPOP-2436 The gremlin server starts even if all graphs instantiation has failed
TINKERPOP-2438 Provide a way for scripts to respect with() specification of timeout
TINKERPOP-2440 Simplify driver by delegating keepAlive logic to Netty
TINKERPOP-2441 Add compression to WebSocket frames sent from client
TINKERPOP-2442 Make Translators that work in Java part of gremlin-core
TINKERPOP-2445 Speed up client initialization (breaking)
TINKERPOP-2446 Add Recipe for Optional Looping
TINKERPOP-2453 Add WebSocket compression to gremlin-python
TINKERPOP-2461 Align CoreImports with GroovyTranslator
TINKERPOP-2462 Duplicated BytecodeUtil and BytecodeHelper classes
TINKERPOP-2466 Improve syntax for Groovy scripts that use withStrategies()
TINKERPOP-2468 Stabilize shouldProcessSessionRequestsInOrder() test
TINKERPOP-2469 KrbException - Principal does not exist in test
TINKERPOP-2474 withSack() Groovy translation output could be simplified
TINKERPOP-2479 Provide a way to set a custom GraphSONMapper for :bytecode command
TINKERPOP-2482 Rename wsConnectionTimeout to connectionSetupTimeout

TinkerPop 3.4.8 (Release Date: August 3, 2020)

Fixed bug in has(T,Traversal) where results were not being returned.
Fixed bug in select(Traversal) where side-effects were getting lost if accessed from the child traversal.
Fixed authorization bug when using WsAndHttpChannelizerHandler with keep-alive enabled.
Fixed bug in option-less construction of DriverRemoteConnection in Javascript.
Bumped Jackson to 2.9.10.5.
Improved sampling distribution for global scope sample() operations.

Bugs

TINKERPOP-2288 Get ConnectionPoolBusyException and then ServerUnavailableExceptions
TINKERPOP-2352 Gremlin Python driver default pool size makes Gremlin keep-alive difficult
TINKERPOP-2374 SaslAndHttpBasicAuthenticationHandler can’t extract authorization
TINKERPOP-2383 has(T,Traversal) does not return results
TINKERPOP-2384 Inject and withSideEffect causing different outcomes in order step

Improvements

TINKERPOP-2328 Do not close all connections if just one has became closed
TINKERPOP-2376 Probability distribution controlled by weight when using sample step

TinkerPop 3.4.7 (Release Date: June 1, 2020)

This release also includes changes from 3.3.11.

Gremlin.NET driver: Fixed a NullReferenceException and throw clear exception if received message is empty.
Bumped to Groovy 2.5.11.
Modified ImportGremlinPlugin to allow for field imports.
Improved error message for math() when the selected key in a Map is null or not a Number.
Added :cls command to Gremlin Console to clear the screen.
Bumped Netty 4.1.49.

Bugs

TINKERPOP-2192 Gremlin.Net.Driver.Connection.Parse throws a NullReferenceException
TINKERPOP-2345 NullPointerException when Map key is not found for math()
TINKERPOP-2347 Remove invalid service descriptors from gremlin-shaded
TINKERPOP-2350 clone() is not deep copying Traversal internals
TINKERPOP-2351 Local Map ordering of keys can generate cast errors
TINKERPOP-2353 Error while Shutting Down Gremlin Server
TINKERPOP-2355 Jackson-databind version in Gremlin shaded dependency needs to be increased - introduces vulnerability issues
TINKERPOP-2360 failed to deserializer int32 when gremlin-python submit bytecode with a big int value
TINKERPOP-2365 LazyBarrierStrategy adds a NoOpBarrierStep when profile() is present
TINKERPOP-2368 JAVA_OPTIONS are not properly expanded in gremlin-console

Improvements

TINKERPOP-2215 Better exception message for connection problems
TINKERPOP-2336 Allow close of channel without having to wait for server
TINKERPOP-2339 Gremlin.Net: Update System.Net.WebSockets.Client dependency
TINKERPOP-2354 Document recommendation to reuse graph traversal source
TINKERPOP-2357 Add a command to clear the Gremlin Console screen
TINKERPOP-2371 Add possibility to import constants with ImportGremlinPlugin

TinkerPop 3.4.6 (Release Date: February 20, 2020)

Fixed bug in drop() of properties which was introduced in 3.4.5.

Bugs

TINKERPOP-2338 drop() not removing all edge/meta properties

TinkerPop 3.4.5 (Release Date: February 3, 2020)

This release also includes changes from 3.3.10.

Expanded the use of by(String) modulator so that it can work on Map as well as Element.
Improved error messaging for by(String) so that it is more clear as to what the problem is
Bumped to Netty 4.1.42
Improved SPARQL query translation to better allow for index optimizations during execution.
Improved Gremlin Server websocket handling preventing automatic server close of the channel for protocol errors.
Introduced internal Buffer API as a way to wrap Netty’s Buffer API and moved GraphBinaryReader, GraphBinaryWriter and TypeSerializer<T> to gremlin-core.
Unified the behavior of property comparison: only compare key&value.
Supported hasKey() and hasValue() step for edge property and meta property, like g.E().properties().hasKey('xx').
Modified driver to send overrideRequestId and userAgent to server when they are present in RequestOptions for bytecode requests.

Bugs

TINKERPOP-2175 Executor thread is not returned on channel close
TINKERPOP-2266 Keep alive not started at connection creation
TINKERPOP-2274 Test of TinkerGraph Gremlin fail on Windows and non EN locale
TINKERPOP-2318 Edge properties dedup() not work with spark-gremlin (breaking)
TINKERPOP-2332 JavaScript GLV: structure element toString() should internally call toString()
TINKERPOP-2333 JavaScript GLV: GraphSON2/3 Edge deserialization is invalid

Improvements

TINKERPOP-1733 hasKey, hasValues should work on Element and Property
TINKERPOP-2262 Improve Netty protocol handling
TINKERPOP-2305 GraphBinary: Wrap Buffer API
TINKERPOP-2307 Add better error message for badly configured Channelizer
TINKERPOP-2309 Bump gremlinpython to Tornado 5.x
TINKERPOP-2314 Employ by(String) for Map when possible and improve errors around incorrect types
TINKERPOP-2315 Implement some form of clone() or reset() for Traversal in GLVs
TINKERPOP-2320 [SECURITY] XMLInputFactory initialization in GraphMLReader introduces
TINKERPOP-2322 Deprecate Jython support
TINKERPOP-2324 Deprecate the raw NIO support in the Java driver
TINKERPOP-2325 Generate traversals that will better yield index lookups with SPARQL
TINKERPOP-2329 JavaScript GLV: Update websocket library dependency
TINKERPOP-2330 JavaScript GLV should expose GraphSON2Writer and GraphSONReader

TinkerPop 3.4.4 (Release Date: October 14, 2019)

This release also includes changes from 3.3.9.

Provided support for DSLs by way of remote connections through AnonymousTraversalSource.
Added elementMap() step.
Added GraphBinary support for Python.
Allowed for embedded map assertions in GLV tests.
Added Direction deserialization support in GLVs.

Bugs

TINKERPOP-2159 EventStrategy doesn’t handle multi-valued properties
TINKERPOP-2276 No constructor for remote connection in DSL generated traversal source
TINKERPOP-2283 GraphStep’s ids null exception
TINKERPOP-2285 Error object is unreachable
TINKERPOP-2289 Use address instead of hostname for connection
TINKERPOP-2290 Javascript GLV connection refused error handling
TINKERPOP-2291 TraversalExplanation deserialization in GraphSON
TINKERPOP-2298 Bytecode.java flattenArguments throw exception when null
TINKERPOP-2303 GremlinDsl generate addV instead of addE

Improvements

TINKERPOP-1810 Add Lambda.binaryOperator and Lambda.unaryOperator
TINKERPOP-1838 Python sample script
TINKERPOP-2046 Gremlin-Python: Support custom request headers in WebSocket request
TINKERPOP-2213 Replace scriptEvaluationTimeout in favor of something more suitable to bytecode
TINKERPOP-2275 Update jackson databind 2.9.9.3+
TINKERPOP-2277 Python sdk postpone the timing to create transport
TINKERPOP-2279 GraphBinary support in Python
TINKERPOP-2280 Prevent use of T values as property key overloads
TINKERPOP-2284 Make it easier to return more structure of graph elements
TINKERPOP-2302 Add isOnGraphComputer() field accessor to ElementMapStep

TinkerPop 3.4.3 (Release Date: August 5, 2019)

This release also includes changes from 3.3.8.

Improved error messaging on timeouts returned to the console from :>.
Added a toString() serializer for GraphBinary.
Configured the Gremlin Console to use GraphBinary by default.
Fixed transaction management for empty iterators in Gremlin Server.
Deprecated MessageSerializer implementations for Gryo in Gremlin Server.
Deprecated Serializers enum values of GRYO_V1D0 and GRYO_V3D0.
Deprecated SerTokens values of MIME_GRYO_V1D0 and MIME_GRYO_V3D0.
Added a Docker command to start Gremlin Server with the standard GLV test configurations.
Added aggregate(Scope,String) and deprecated store() in favor of aggregate(local).
Modified NumberHelper to better ignore Double.NaN in min() and max() comparisons.
Bumped to Netty 4.1.36.
Bumped to Groovy 2.5.7.
Added userAgent to RequestOptions. Gremlin Console sends Gremlin Console/<version> as the userAgent.
Fixed DriverRemoteConnection ignoring with Token options when multiple were set.
Added :set warnings <true|false> to Gremlin Console.

Bugs

TINKERPOP-1619 TinkerGraphComputer worker count affects OptionalStep query results
TINKERPOP-2157 SparkStarBarrierInterceptor injects (Byte) 0
TINKERPOP-2224 Detect and fix resource leak
TINKERPOP-2230 match() step unexpected behaviours
TINKERPOP-2232 RemoteStrategy does not call parent class TraversalStrategy init
TINKERPOP-2238 Fix remaining iterator leaks marked by @IgnoreIteratorLeak
TINKERPOP-2241 Client exception don’t match Server exception when server throw StackOverflowError
TINKERPOP-2248 Instability of driver for blocked requests
TINKERPOP-2257 transaction itty may still be visited after commit
TINKERPOP-2264 Gremlin Python should deserialize g:Date to UTC

Improvements

TINKERPOP-1084 Branch option tokens should be allowed to be traversals.
TINKERPOP-1553 Deprecate store() in favor of aggregate(Scope)
TINKERPOP-1921 Support hasNext terminal step in GLVs
TINKERPOP-2020 Support withComputer() for javascript
TINKERPOP-2223 Update jackson databind to 2.9.9
TINKERPOP-2236 Improve error messaging for TinkerGraph IdManagers that fail on conversions
TINKERPOP-2237 Prevent error when closing sessions that don’t exist (breaking)
TINKERPOP-2242 Bump to netty 4.1.36
TINKERPOP-2243 Add user-agent to RequestOptions
TINKERPOP-2246 Consolidate the error propagation to the client
TINKERPOP-2250 Support toString serialization in GraphBinary
TINKERPOP-2256 processAllStarts of AggregateStep should only be called when barrier is empty
TINKERPOP-2260 Update jackson databind 2.9.9.1
TINKERPOP-2265 Deprecate Traversal.getSideEffects() functionality for remoting purposes
TINKERPOP-2270 Deprecate multi/metaproperty support in Neo4j
TINKERPOP-2271 Add console preference to control server-originated warning display
TINKERPOP-2272 Rename steps and tokens that conflict with standard python functions

TinkerPop 3.4.2 (Release Date: May 28, 2019)

This release also includes changes from 3.3.7.

Allow a Traversal to know what TraversalSource it spawned from.
Fixed problem with connection pool sizing and retry.
Added status attribute for warnings to be returned to the client.
Modified Gremlin Console to report warning status attributes.
Changed :> in Gremlin Console to submit the client-side timeout on each request.
Provided method to override the request identifier with RequestOptions.
Added option to set per-request settings on a Traversal submitted via Bytecode.
Fixed the Gryo registration for OptionsStrategy as it was not serializing state properly.

Bugs

TINKERPOP-2090 After running backend for a day or so System.IO.IOException keep throwing
TINKERPOP-2112 Folding in property() step is not being optimally performed
TINKERPOP-2180 gremlin.sh doesn’t work when directories contain spaces
TINKERPOP-2183 InterpreterModeASTTransformation needs to be more specific about what it transforms
TINKERPOP-2189 ConnectedComponent test assumes fixed order of vertices
TINKERPOP-2194 Enforcing an order on properties in one test method of ChooseTest
TINKERPOP-2196 PartitionStrategy with includeMetaProperties(true) can’t add labeled vertex
TINKERPOP-2198 Documentation for Store contradicts itself
TINKERPOP-2199 within step does not work with more than two parameters with python
TINKERPOP-2200 AddEdgeStartStep used DetachedFactory.detach instead of EventStrategy.detach
TINKERPOP-2204 Client receives no response on failed request
TINKERPOP-2206 Certain types in javascript don’t appear to serialize with a GraphSON type
TINKERPOP-2212 Path is not detaching properly under certain conditions
TINKERPOP-2217 Race condition in Gremlin.net driver connection

Improvements

TINKERPOP-2089 Javascript DSL support
TINKERPOP-2179 Have o.a.t.g.driver.ser.SerializationException extend IOException
TINKERPOP-2181 Allow ctrl+c to break out of a long running process in Gremlin Console
TINKERPOP-2182 Remove gperfutils from Gremlin Console (breaking)
TINKERPOP-2190 Document Gremlin sanitization best practices
TINKERPOP-2191 Implement EdgeLabelVerificationStrategy
TINKERPOP-2193 Allow a Traversal to know what TraversalSource it spawned from
TINKERPOP-2203 Bind the console timeout to the request timeout
TINKERPOP-2208 Include inject() in DSLs generated with Java annotation processor
TINKERPOP-2211 Provide API to add per request option for a bytecode
TINKERPOP-2216 Consider adding conventional status attribute key for warnings
TINKERPOP-2219 Upgrade Netty version

TinkerPop 3.4.1 (Release Date: March 18, 2019)

This release also includes changes from 3.3.6.

Gremlin.NET driver: Fixed removal of closed connections and added round-robin scheduling.
Added GraphBinary serializer for TraversalMetrics
Added registration for SparqlStrategy for GraphSON.
Fixed up SparqlStrategy so that it could be used properly with RemoteStrategy.
Fixed ByteBuffer serialization for GraphBinary.
Fixed Path.toString() in gremlin-javascript which was referencing an invalid object.
Fixed potential for an infinite loop in connection creation for gremlin-dotnet.
Added fallback resolver to TypeSerializerRegistry for GraphBinary.
Added easier to understand exceptions for connection problems in the Gremlin.Net driver.
Support configuring the type registry builder for GraphBinary.
Bumped to Groovy 2.5.6.
Release working buffers in case of failure for GraphBinary.
GraphBinary: Use the same ByteBuf instance to write during serialization. Changed signature of write methods in type serializers.
Remove unused parameter in GraphBinary’s ResponseMessageSerializer.
Changed SparqlTraversalSource so as to enable Gremlin steps to be used to process results from the sparql() step.
GraphBinary: Cache expression to obtain the method in PSerializer.

Bugs

TINKERPOP-1992 count has negative time in profile
TINKERPOP-2126 toString() methods not thread-safe
TINKERPOP-2135 Gremlin.Net ConnectionPool doesn’t handle closed idle connections properly
TINKERPOP-2139 Errors during request serialization in WebSocketGremlinRequestEncoder/NioGremlinRequestEncoder are not reported to the client
TINKERPOP-2141 ByteBufferSerializer modifies buffer’s position
TINKERPOP-2148 "no connection available!" is being thrown despite lots of free connections
TINKERPOP-2152 Path toString fails in Gremlin JavaScript
TINKERPOP-2153 Remove unused parameter from ResponseMessageSerializer (breaking)
TINKERPOP-2154 GraphBinary: Serializers should release resources in case of failures
TINKERPOP-2155 Situation can occur that causes infinite amount of connection to be opened, causing System.Net.WebSockets.WebSocketException
TINKERPOP-2161 GraphBinary: Write serialization performance issue
TINKERPOP-2169 Responses exceeding maxContentLength cause subsequent queries to hang
TINKERPOP-2172 PartitionStrategy doesn’t apply to AddEdgeStartStep
TINKERPOP-2173 Incorrect reset of log level in integration test
TINKERPOP-2177 Streaming response immediately after authentication stops after first partial response

Improvements

TINKERPOP-1435 Support for extended GraphSON in gremlin-python
TINKERPOP-1882 Apply range and limit steps as early as possible
TINKERPOP-1998 IoGraphTest use different schemas for standard and readGraph configurations
TINKERPOP-2088 Enable SourceLink for Gremlin.Net
TINKERPOP-2098 Improve gremlin-server.sh help output
TINKERPOP-2122 Expose status codes from server errors
TINKERPOP-2124 InlineFilterStrategy produces wrong result
TINKERPOP-2125 Extend release validation script
TINKERPOP-2127 Add g:TraversalMetrics and g:Metrics deserializers for gremlinpython
TINKERPOP-2129 Mask security secret or password in logs
TINKERPOP-2130 Cannot instantiate DriverRemoteConnection without passing an options object
TINKERPOP-2131 NoConnectionAvailableException doesn’t reveal the reason
TINKERPOP-2134 Bump to Groovy 2.5.6
TINKERPOP-2136 Inside lower bound inclusion (documentation)
TINKERPOP-2138 Provide a configuration to disable the global closure cache
TINKERPOP-2140 Test build with Docker automatically
TINKERPOP-2144 Better handle Authenticator instance failures
TINKERPOP-2147 Add GraphBinary serializer for TraversalMetrics
TINKERPOP-2149 GraphBinary: Make type serializer resolution pluggable
TINKERPOP-2150 GraphBinary: Support configuring the TypeSerializerRegistry builder class in config
TINKERPOP-2163 JavaTranslator performance enhancements
TINKERPOP-2164 Bytecode’s hashCode impl (and its inner classes) can produce hash collisions
TINKERPOP-2165 Prefer commons-lang3 to commons-lang
TINKERPOP-2166 GraphBinary: P deserialization should be optimized
TINKERPOP-2167 Gremlin Javascript Traversal as async iterable
TINKERPOP-2171 Allow SPARQL to be extended with Gremlin steps
TINKERPOP-2174 Improve Docker Image Security

TinkerPop 3.4.0 (Release Date: January 2, 2019)

This release also includes changes from 3.3.4 and 3.3.5.

Changed Python "bindings" to use an actual Bindings object rather than a 2-tuple.
Improved the Gremlin.NET driver: It now uses request pipelining and its ConnectionPool has a fixed size.
Implemented IndexStep which allows to transform local collections into indexed collections or maps.
Made valueMap() aware of by and with modulators and deprecated valueMap(boolean) overloads.
Use Compare.eq in Contains predicates to ensure the same filter behavior for numeric values.
Added OptionsStrategy to allow traversals to take arbitrary traversal-wide configurations.
Added text predicates.
Added BulkSet as a GraphSON type with support in all language variants.
Added ReferenceElementStrategy to auto-detach elements to "reference" from a traversal.
Added initial release of the GraphBinary serialization format with Java support.
Allowed ImportCustomizer to accept fields.
Removed groovy-sql dependency.
Modified Mutating steps so that they are no longer marked as final.
Rewrote ConnectiveStrategy to support an arbitrary number of infix notations in a single traversal.
GraphSON MessageSerializer s will automatically register the GremlinServerModule to a provided GraphSONMapper.
Removed support for -i option in Gremlin Server which was previously deprecated.
Implemented ShortestPathVertexProgram and the shortestPath() step.
AbstractGraphProvider uses g.io() for loading test data.
Added the io() start step and read() and write() termination steps to the Gremlin language.
Added GraphFeatures.supportsIoRead() and GraphFeatures.supportsIoWrite().
Deprecated Graph.io() and related infrastructure.
GraphMLReader better handles edge and vertex properties with the same name.
Maintained order of annotations in metrics returned from profile()-step.
Refactored TypeTranslator to be directly extensible for ScriptTranslator functions.
Bumped to Netty 4.1.25.
Bumped to Spark 2.4.0.
Bumped to Groovy 2.5.4.
Modified Gremlin Server to return a "host" status attribute on responses.
Added ability to the Java, .NET, Python and JavaScript drivers to retrieve status attributes returned from the server.
Modified Java and Gremlin.Net ResponseException to include status code and status attributes.
Modified Python GremlinServerError to include status attributes.
Modified the return type for IGremlinClient.SubmitAsync() to be a ResultSet rather than an IReadOnlyCollection.
Deprecated two submit()-related methods on the Java driver Client class.
Added Client.submit() overloads that accept per-request RequestOptions.
Added sparql-gremlin.
Fixed a bug in dynamic Gryo registration where registrations that did not have serializers would fail.
Moved Parameterizing interface to the org.apache.tinkerpop.gremlin.process.traversal.step package with other marker interfaces of its type.
Replaced Parameterizing.addPropertyMutations() with Configuring.configure().
Changed interface hierarchy for Parameterizing and Mutating interfaces as they are tightly related.
Introduced the with(k,v) and with(k) step modulators which can supply configuration options to Configuring steps.
Added OptionsStrategy to allow traversals to take arbitrary traversal-wide configurations.
Introduced the with(k,v) and with(k) traveral source configuration options which can supply configuration options to the traversal.
Added connectedComponent() step and related VertexProgram.
Added supportsUpsert() option to VertexFeatures and EdgeFeatures.
min() and max() now support all types implementing Comparable.
Change the toString() of Path to be standardized as other graph elements are.
hadoop-gremlin no longer generates a test artifact.
Allowed GraphProvider to expose a cached Graph.Feature object so that the test suite could re-use them to speed test runs.
Fixed a bug in ReducingBarrierStep, that returned the provided seed value despite no elements being available.
Changed the order of select() scopes. The order is now: maps, side-effects, paths.
Moved TraversalEngine to gremlin-test as it has long been only used in testing infrastructure.
Nested loop support added allowing repeat() steps to be nested.
Events from EventStrategy raised from "new" mutations will now return a KeyedVertexProperty or KeyedProperty as is appropriate.
MutationListener#vertexPropertyChanged(Vertex, VertexProperty, Object, Object…) no longer has a default implementation.
Deprecated GraphSONMessageSerializerV2d0 as it is now analogous to GraphSONMessageSerializerGremlinV2d0.
Moved previously deprecated RemoteGraph to gremlin-test as it is now just a testing component.
Removed previously deprecated RemoteStrategy.instance() and the strategy no longer has any connection to RemoteGraph.
Removed previously deprecated methods in SubgraphStrategy and PartitionStrategy builders.
Removed previously deprecated Credentials DSL infrastructure.
Removed previously deprecated RemoteConnection#submit(Traversal) and RemoteConnection#submit(Bytecode) methods.
Removed previously deprecated MutationListener#vertexPropertyChanged(Vertex, Property, Object, Object…).
Removed previously deprecated OpSelectorHandler constructor.
Removed previously deprecated close() from GremlinGroovyScriptEngine which no longer implements AutoCloseable.
Removed previously deprecated getGraphInputFormat() and getGraphOutputFormat() from HadoopConfiguration.
Removed previously deprecated AbstractOpProcessor#makeFrame() method.
Removed previously deprecated AuthenticationSettings.className configuration option in Gremlin Server.
Removed previously deprecated GraphManager methods getGraphs() and getTraversalSources().
Removed previously deprecated Gremlin Server setting for serializedResponseTimeout.
Removed previously deprecated Structure API exceptions related to "element not found" situations.
Removed previously deprecated rebindings options from the Java driver API.
Removed previously deprecated LambdaCollectingBarrierStep.Consumers enum.
Removed previously deprecated HasContainer#makeHasContainers(String, P)
Removed support for Giraph.
Removed previously deprecated JavaScript Driver property traversers of the ResultSet.
gremlin-python: use explicit Bindings object for python instead of a 2-tuple

Bugs

TINKERPOP-1777 Gremlin .max step returns -2147483648 for empty result sets (breaking)
TINKERPOP-1869 Profile step and iterate do not play nicely with each other
TINKERPOP-1898 Issue with bindings in strategies and lambdas
TINKERPOP-1927 Gherkin scenario expects list with duplicates, but receives g:Set
TINKERPOP-1933 gremlin-python maximum recursion depth exceeded on large responses
TINKERPOP-1947 Path history isn’t preserved for keys in mutations
TINKERPOP-1949 Formatting error on website
TINKERPOP-1958 TinkerGraphCountStrategy can return wrong counts
TINKERPOP-1961 Duplicate copies of images directory in docs
TINKERPOP-1962 GroovyTranslator doesn’t handle empty maps
TINKERPOP-1963 Use of reducing step in choose()
TINKERPOP-1972 inject() tests are throwing exceptions in .NET GLV tests
TINKERPOP-1978 Check for Websocket connection state when retrieved from Connection Pool missing
TINKERPOP-1979 Several OLAP issues in MathStep
TINKERPOP-1988 minor error in documentation
TINKERPOP-1999 [Java][gremlin-driver] Query to a remote server via the websocket client hangs indefinitely if the server becomes unavailable
TINKERPOP-2005 Intermittent NullPointerException in response handling
TINKERPOP-2006 GraphML serialization invalid if a vertex and edge have similar named property
TINKERPOP-2009 Pick.any and Pick.none should be exposed in Gremlin-JavaScript
TINKERPOP-2021 Prevent maximum recursion depth failure
TINKERPOP-2028 AbstractGraphSONMessageSerializerV2d0 should register GremlinServerModule when mapper is provided
TINKERPOP-2029 ConcurrentModificationException for InlineFilterStrategy
TINKERPOP-2030 KeepAlive task executed for every Connection.write call
TINKERPOP-2032 Update jython-standalone
TINKERPOP-2044 Cannot reconnect to Azure cosmos host that becomes available again
TINKERPOP-2058 Contains predicates should rely on Compare predicates (breaking)
TINKERPOP-2081 PersistedOutputRDD materialises rdd lazily with Spark 2.x
TINKERPOP-2091 Wrong/Missing feature requirements in StructureStandardTestSuite
TINKERPOP-2094 Gremlin Driver Cluster Builder serializer method does not use mimeType as suggested
TINKERPOP-2095 GroupStep looks for irrelevant barrier steps
TINKERPOP-2096 gremlinpython: AttributeError when connection is closed before result is received
TINKERPOP-2100 coalesce() creating unexpected results when used with order()
TINKERPOP-2113 P.Within() doesn’t work when given a List argument

Improvements

TINKERPOP-550 Gremlin IO needs to support both OLTP and OLAP naturally.
TINKERPOP-967 Support nested-repeat() structures
TINKERPOP-1113 GraphComputer subclasses should support native methods
TINKERPOP-1143 Remove deprecated TraversalSource.Builder and TraversalEngine. (breaking)
TINKERPOP-1296 Remove deprecated serializedResponseTimeout from Gremlin Server (breaking)
TINKERPOP-1342 Allow setting scriptEvaluationTimeout in driver
TINKERPOP-1365 Log the seed used to initialize Random in tests
TINKERPOP-1410 mvn install -Dmaven.test.skip=true doesn’t work on a clean machine (breaking)
TINKERPOP-1446 Add a StringFactory for Path which prefixes with type.
TINKERPOP-1447 Add some JavaScript intelligence to the documentation so that comments and output are not copied in a copy paste
TINKERPOP-1494 Means of exposing execution information from a result produced by RemoteConnection
TINKERPOP-1518 Provide a way for providers to expose static Graph.Features to tests
TINKERPOP-1522 Order of select() scopes (breaking)
TINKERPOP-1595 Go through TraversalVertexProgram with a profile and optimize.
TINKERPOP-1628 Implement TraversalSelectStep
TINKERPOP-1685 Introduce optional feature to allow for upserts without read-before-write
TINKERPOP-1705 Remove deprecated rebindings option (breaking)
TINKERPOP-1707 Remove deprecated AuthenticationSettings.className option (breaking)
TINKERPOP-1755 No docs for ReferenceElements
TINKERPOP-1769 Python graph[empty] string representation is confusing
TINKERPOP-1774 Gremlin .NET: Support min and max sizes in Connection pool
TINKERPOP-1775 Gremlin .NET: Implement a Connection write queue to support request pipelining
TINKERPOP-1778 Do not promote timedInterrupt option for Gremlin Server script processing
TINKERPOP-1780 Add authentication tests for gremlin-python
TINKERPOP-1831 Refactor EventStrategy (breaking)
TINKERPOP-1836 .NET sample project
TINKERPOP-1841 Include Python GLV tests on TravisCI
TINKERPOP-1849 Provide a way to fold() with an index
TINKERPOP-1864 Gremlin Python tests for GraphSON 2.0 and 3.0
TINKERPOP-1878 Sparql to Gremlin Compiler
TINKERPOP-1888 Extend max and min to all Comparable properties, not just Numbers (breaking)
TINKERPOP-1889 JavaScript GLV: Use heartbeat to prevent connection timeout
TINKERPOP-1897 Provide Docker images of Gremlin Server and Console
TINKERPOP-1906 Make ResponseException explorable
TINKERPOP-1912 Remove MD5 checksums
TINKERPOP-1913 Expose metadata from Gremlin Server to Clients
TINKERPOP-1930 Drop support for Giraph (breaking)
TINKERPOP-1934 Bump to latest version of httpclient
TINKERPOP-1936 Performance enhancement to Bytecode deserialization
TINKERPOP-1941 Remove deprecated Structure API exception methods (breaking)
TINKERPOP-1942 Binary serialization format
TINKERPOP-1945 Add support for extended GraphSon types to Gremlin.net
TINKERPOP-1946 Remove the deprecated Credentials DSL infrastructure (breaking)
TINKERPOP-1950 Traversal construction performance enhancements
TINKERPOP-1951 gremlin-server.bat doesn’t support paths containing spaces
TINKERPOP-1953 Bump to Groovy 2.4.15
TINKERPOP-1954 Remove deprecated GraphManager methods (breaking)
TINKERPOP-1959 Provide a way to submit scripts to the server in gremlin-javascript
TINKERPOP-1967 Add a connectedComponent() step
TINKERPOP-1968 Refactor elements of Gremlin Server testing
TINKERPOP-1975 Introduce with() step modulator (breaking)
TINKERPOP-1976 Include Computer tests for GLVs
TINKERPOP-1977 Gremlin-JavaScript: Support SASL authentication
TINKERPOP-1984 Allow support for multiple serializer versions in Gremlin Server HTTP (breaking)
TINKERPOP-1985 Update position on bulk loading
TINKERPOP-1986 Remove deprecation from PartitionStrategy, SubgraphStrategy and GremlinScriptEngine (breaking)
TINKERPOP-1987 Bump to Netty 4.1.x
TINKERPOP-1989 Preserve order that plugins are applied in Gremlin Console
TINKERPOP-1990 Add a shortestPath() step
TINKERPOP-1993 Bump to Spark 2.3.1
TINKERPOP-1995 DriverRemoteConnection close() method returns undefined
TINKERPOP-1996 Introduce read() and write() steps
TINKERPOP-2002 Create a blog post explaining the value of using TinkerPop
TINKERPOP-2010 Generate jsdoc for gremlin-javascript
TINKERPOP-2011 Use NumberHelper on choose()
TINKERPOP-2012 Target .NET Standard 2.0 for Gremlin.Net
TINKERPOP-2013 Process tests that are auto-ignored stink
TINKERPOP-2015 Allow users to configure the WebSocket connections
TINKERPOP-2016 Upgrade Jackson FasterXML to 2.9.5 or later to fix security vulnerability
TINKERPOP-2017 Check for Column in by()
TINKERPOP-2018 Generate API docs for Gremlin.Net
TINKERPOP-2022 Cluster SSL should trust default ca certs by default
TINKERPOP-2023 Gremlin Server should not create self-signed certs (breaking)
TINKERPOP-2024 Gremlin Server Application archetype should connect via withRemote
TINKERPOP-2025 Change to SHA-256/512 and drop SHA-1 for releases
TINKERPOP-2026 Gremlin.Net.Driver should check ClientWebSocket.State before closing
TINKERPOP-2031 Remove support for -i in gremlin-server.sh (breaking)
TINKERPOP-2033 Maintain order of profile() annotations
TINKERPOP-2034 Register synchronizedMap() with Gryo
TINKERPOP-2037 Remove unused groovy-sql dependency
TINKERPOP-2038 Make groovy script cache size configurable
TINKERPOP-2039 Bump to Groovy 2.5.2 (breaking)
TINKERPOP-2040 Improve flexibility of GroovyTranslator to handle custom types
TINKERPOP-2041 Text Predicates
TINKERPOP-2045 Remove non-indy groovy dependencies
TINKERPOP-2049 Single argument with() overload
TINKERPOP-2050 Add a :bytecode command to Gremlin Console
TINKERPOP-2053 Provider OptionsStrategy for traversal configurations
TINKERPOP-2055 Provide support for special number cases like Infinity in GraphSON
TINKERPOP-2056 Use NumberHelper in Compare
TINKERPOP-2059 Modulation of valueMap() (breaking)
TINKERPOP-2060 Make Mutating steps non-final
TINKERPOP-2061 Add with() configuration as global to a traversal
TINKERPOP-2062 Add Traversal class to CoreImports
TINKERPOP-2064 Add status attributes to results for gremlin-javascript
TINKERPOP-2065 Optimize iterate() for remote traversals
TINKERPOP-2066 Bump to Groovy 2.5.3
TINKERPOP-2067 Allow getting raw data from Gremlin.Net.Driver.IGremlinClient
TINKERPOP-2068 Bump Jackson Databind 2.9.7
TINKERPOP-2069 Document configuration of Gremlin.Net
TINKERPOP-2070 gremlin-javascript: Introduce Connection representation
TINKERPOP-2071 gremlin-python: the graphson deserializer for g:Set should return a python set
TINKERPOP-2072 Refactor custom type translation for ScriptTranslators (breaking)
TINKERPOP-2073 Generate tabs for static code blocks
TINKERPOP-2074 Ensure that only NuGet packages for the current version are pushed
TINKERPOP-2075 Introduce ReferenceElementStrategy
TINKERPOP-2077 VertexProgram.Builder should have a default create() method with no Graph
TINKERPOP-2078 Hide use of EmptyGraph or RemoteGraph behind a more unified method for TraversalSource construction
TINKERPOP-2079 Move RemoteGraph to test package (breaking)
TINKERPOP-2084 For remote requests in console display the remote stack trace
TINKERPOP-2092 Deprecate default GraphSON serializer fields
TINKERPOP-2093 Bump to Groovy 2.5.4
TINKERPOP-2097 Create a DriverRemoteConnection with an initialized Client
TINKERPOP-2101 Support Spark 2.4
TINKERPOP-2103 Remove deprecated submit() options on RemoteConnection (breaking)
TINKERPOP-2104 Allow ImportCustomizer to handle fields
TINKERPOP-2106 When gremlin executes timeout, throw TimeoutException instead of TraversalInterruptedException/InterruptedIOException
TINKERPOP-2110 Allow Connection on Different Path (from /gremlin)
TINKERPOP-2111 Add BulkSet as a GraphSON type (breaking)
TINKERPOP-2114 Document common Gremlin anti-patterns
TINKERPOP-2116 Explicit Bindings object for Python (breaking)
TINKERPOP-2117 gremlin-python: Provide a better data structure for a Binding
TINKERPOP-2119 Validate C# code samples in docs
TINKERPOP-2121 Bump Jackson Databind 2.9.8

TinkerPop 3.3.0 (Gremlin Symphony #40 in G Minor)

TinkerPop 3.3.11 (Release Date: June 1, 2020)

Added trustStoreType such that keystore and truststore can be of different types in the Java driver.
Added session support to all GLVs: Javascript, .NET and Python.
Fixed bug in Gremlin Server shutdown if failures occurred during GraphManager initialization.
Modified Gremlin Server to close the session when the channel itself is closed.
Fixed bug in Order where comparisons of enum types wouldn’t compare with String values.
Added maxWaitForClose configuration option to the Java driver.
Deprecated maxWaitForSessionClose in the Java driver.
Bumped to Jackson 2.9.10.4.
Remove invalid service descriptors from gremlin-shaded.
Fixed bug in Python and .NET traversal clone() where deep copies of bytecode were not occurring.
Fixed bug where profile() was forcing LazyBarrierStrategy to add an extra barrier() to the end of traversals.
Fixed bug in Python about integer serializer which was out of range of g:Int32
Bumped commons-codec 1.14

Bugs

TINKERPOP-2347 Remove invalid service descriptors from gremlin-shaded
TINKERPOP-2350 clone() is not deep copying Traversal internals
TINKERPOP-2351 Local Map ordering of keys can generate cast errors
TINKERPOP-2353 Error while Shutting Down Gremlin Server
TINKERPOP-2355 Jackson-databind version in Gremlin shaded dependency needs to be increased - introduces vulnerability issues
TINKERPOP-2360 failed to deserializer int32 when gremlin-python submit bytecode with a big int value
TINKERPOP-2365 LazyBarrierStrategy adds a NoOpBarrierStep when profile() is present

Improvements

TINKERPOP-2336 Allow close of channel without having to wait for server
TINKERPOP-2339 Gremlin.Net: Update System.Net.WebSockets.Client dependency
TINKERPOP-2354 Document recommendation to reuse graph traversal source

TinkerPop 3.3.10 (Release Date: February 3, 2020)

Improved error messaging for a Cluster with a bad Channelizer configuration in the Java driver.
Made Cluster be able to open configuration file on resources directory.
Implemented Traversal.clone() operations for all language variants.
Refactored PathProcessorStrategy to use the marker model.
Bumped to Tornado 5.x for gremlin-python.
Started keep-alive polling on Connection construction to ensure that a Connection doesn’t die in the pool.
Deprecated TraversalStrategies.applyStrategies().
Deprecated Jython support in gremlin-python.
Deprecated NioChannelizer and related classes in gremlin-driver and gremlin-server.
Fixed a bug in the ClassCacheRequestCount metric for GremlinGroovyScriptEngine which wasn’t including the cache hit count, only the misses.
Improved Gremlin Server executor thread handling on client close requests.
Reverted: Modified Java driver to use IP address rather than hostname to create connections.
Allow custom XMLInputFactory to be used with GraphMLReader.

Bugs

TINKERPOP-2175 Executor thread is not returned on channel close
TINKERPOP-2266 Keep alive not started at connection creation
TINKERPOP-2274 Test of TinkerGraph Gremlin fail on Windows and non EN locale
TINKERPOP-2332 JavaScript GLV: structure element toString() should internally call toString()
TINKERPOP-2333 JavaScript GLV: GraphSON2/3 Edge deserialization is invalid

Improvements

TINKERPOP-2307 Add better error message for badly configured Channelizer
TINKERPOP-2309 Bump gremlinpython to Tornado 5.x
TINKERPOP-2315 Implement some form of clone() or reset() for Traversal in GLVs
TINKERPOP-2320 [SECURITY] XMLInputFactory initialization in GraphMLReader introduces
TINKERPOP-2322 Deprecate Jython support
TINKERPOP-2324 Deprecate the raw NIO support in the Java driver
TINKERPOP-2329 JavaScript GLV: Update websocket library dependency
TINKERPOP-2330 JavaScript GLV should expose GraphSON2Writer and GraphSONReader

TinkerPop 3.3.9 (Release Date: October 14, 2019)

Exposed response status attributes in a ResponseError in gremlin-javascript.
Added ImmutableExplanation for a TraversalExplanation that just contains data.
Added support for UnaryOperator and BinaryOperator for Lambda instances.
Fixed TraversalExplanation deserialization in GraphSON 2 and 3 which was not supported before in Java.
Added support for custom request headers in Python.
Fixed Java DSL annotation for generation of addE() which was formerly calling the wrong step.
Deprecated scriptEvaluationTimeout in favor of the more generic evaluationTimeout.
Bumped jackson-databind to 2.9.10 due to CVE-2019-14379, CVE-2019-14540, CVE-2019-16335.
Added ReservedKeysVerificationStrategy to allow warnings or exceptions when certain keys are used for properties.
Added the AbstractWarningVerificationStrategy base class for "warning" style VerificationStrategy implementations.
Refactored EdgeLabelVerificationStrategy to use AbstractWarningVerificationStrategy.
Added EdgeLabelVerificationStrategy to Python.
Improved handling of null values in bytecode construction.
Fixed Java driver authentication problems when calling the driver from multiple threads.
Modified Java driver to use IP address rather than hostname to create connections.
Fixed potential for NullPointerException with empty identifiers in GraphStep.
Postponed the timing of transport creation to connection.write in Gremlin Python.
Made EventStrategy compatible with multi-valued properties.
Changed TraversalOpProcessor to throw a SERVER_ERROR_SCRIPT_EVALUATION (597) if lambdas don’t compile.
Bumped commons-compress to 1.19 due to CVE-2018-11771.
gremlin-javascript: Use socketError Connection event to prevent exit on error and expose Connection events.

Bugs

TINKERPOP-2159 EventStrategy doesn’t handle multi-valued properties
TINKERPOP-2283 GraphStep’s ids null exception
TINKERPOP-2285 Error object is unreachable
TINKERPOP-2289 Use address instead of hostname for connection
TINKERPOP-2290 Javascript GLV connection refused error handling
TINKERPOP-2291 TraversalExplanation deserialization in GraphSON
TINKERPOP-2298 Bytecode.java flattenArguments throw exception when null
TINKERPOP-2303 GremlinDsl generate addV instead of addE

Improvements

TINKERPOP-1810 Add Lambda.binaryOperator and Lambda.unaryOperator
TINKERPOP-1838 Python sample script
TINKERPOP-2046 Gremlin-Python: Support custom request headers in WebSocket request
TINKERPOP-2213 Replace scriptEvaluationTimeout in favor of something more suitable to bytecode
TINKERPOP-2275 Update jackson databind 2.9.9.3+
TINKERPOP-2277 Python sdk postpone the timing to create transport
TINKERPOP-2280 Prevent use of T values as property key overloads

TinkerPop 3.3.8 (Release Date: August 5, 2019)

Provided support for withComputer() in gremlin-javascript.
Deprecated remote traversal side-effect retrieval and related infrastructure.
Bumped to Groovy 2.4.17.
Bumped to Jackson Databind 2.9.9.1.
Fixed bug with Python in g:Date of GraphSON where local time zone was being used during serialization/deserialization.
Improved error messaging when an attempt is made to serialize multi-properties to GraphML.
Deprecated multi/meta-property support in Neo4jGraph.
Improved exception and messaging for gt/gte/lt/lte when one of the object isn’t a Comparable.
Added test infrastructure to check for storage iterator leak.
Fixed multiple iterator leaks in query processor.
Fixed optional() so that the child traversal is treated as local.
Changed default keep-alive time for driver to 3 minutes.
Fixed bug where server-side keep-alive was not always disabled when its setting was zero.
Added support for hasNext() in Javascript and .NET.
Improved error messaging for invalid inputs to the TinkerGraph IdManager instances.
Forced replacement of connections in Java driver for certain exception types that seem to ultimately kill the connection.
Changed the reverse() of desc and asc on Order to not use the deprecated decr and incr.
Fixed bug in MatchStep where the correct was not properly determined.
Fixed bug where client/server exception mismatch when server throw StackOverflowError
Added underscore suffixed steps and tokens in Gremlin-Python that conflict with global function names.
Prevent exception when closing a session that doesn’t exist.
Allow predicates and traversals to be used as options in BranchStep.
Ensure only a single final response is sent to the client with Gremlin Server.
Deprecated ResponseHandlerContext with related infrastructure and folded its functionality into Context in Gremlin Server.
Improved performance of aggregate() by avoiding excessive calls to hasNext() when the barrier is empty.

Bugs

TINKERPOP-1619 TinkerGraphComputer worker count affects OptionalStep query results
TINKERPOP-2224 Detect and fix resource leak
TINKERPOP-2230 match() step unexpected behaviours
TINKERPOP-2232 RemoteStrategy does not call parent class TraversalStrategy init
TINKERPOP-2238 Fix remaining iterator leaks marked by @IgnoreIteratorLeak
TINKERPOP-2241 Client exception don’t match Server exception when server throw StackOverflowError
TINKERPOP-2248 Instability of driver for blocked requests
TINKERPOP-2264 Gremlin Python should deserialize g:Date to UTC

Improvements

TINKERPOP-1084 Branch option tokens should be allowed to be traversals.
TINKERPOP-1921 Support hasNext terminal step in GLVs
TINKERPOP-2020 Support withComputer() for javascript
TINKERPOP-2223 Update jackson databind to 2.9.9
TINKERPOP-2236 Improve error messaging for TinkerGraph IdManagers that fail on conversions
TINKERPOP-2237 Prevent error when closing sessions that don’t exist (breaking)
TINKERPOP-2246 Consolidate the error propagation to the client
TINKERPOP-2256 processAllStarts of AggregateStep should only be called when barrier is empty
TINKERPOP-2260 Update jackson databind 2.9.9.1
TINKERPOP-2265 Deprecate Traversal.getSideEffects() functionality for remoting purposes
TINKERPOP-2270 Deprecate multi/metaproperty support in Neo4j
TINKERPOP-2272 Rename steps and tokens that conflict with standard python functions

TinkerPop 3.3.7 (Release Date: May 28, 2019)

Developed DSL pattern for gremlin-javascript.
Generated uberjar artifact for Gremlin Console.
Improved folding of property() step into related mutating steps.
Added inject() to steps generated on the DSL TraversalSource.
Removed gperfutils dependencies from Gremlin Console.
Fixed PartitionStrategy when setting vertex label and having includeMetaProperties configured to true.
Ensure gremlin.sh works when directories contain spaces.
Prevented client-side hangs if metadata generation fails on the server.
Fixed bug with EventStrategy in relation to addE() where detachment was not happening properly.
Ensured that gremlin.sh works when directories contain spaces.
Fixed bug in detachment of Path where embedded collection objects would prevent that process.
Enabled ctrl+c to interrupt long running processes in Gremlin Console.
Quieted "host unavailable" warnings for both the driver and Gremlin Console.
Fixed construction of g:List from arrays in gremlin-javascript.
Fixed bug in GremlinGroovyScriptEngine interpreter mode around class definitions.
Implemented EdgeLabelVerificationStrategy.
Fixed behavior of P for within() and without() in GLVs to be consistent with Java when using varargs.
Cleared the input buffer after exceptions in Gremlin Console.
Added parameter to configure the processor in the gremlin-javascript client constructor.
Bumped Netty to 4.1.32.

Bugs

TINKERPOP-2112 Folding in property() step is not being optimally performed
TINKERPOP-2180 gremlin.sh doesn’t work when directories contain spaces
TINKERPOP-2183 InterpreterModeASTTransformation needs to be more specific about what it transforms
TINKERPOP-2194 Enforcing an order on properties in one test method of ChooseTest
TINKERPOP-2196 PartitionStrategy with includeMetaProperties(true) can’t add labeled vertex
TINKERPOP-2198 Documentation for Store contradicts itself
TINKERPOP-2199 within step does not work with more than two parameters with python
TINKERPOP-2200 AddEdgeStartStep used DetachedFactory.detach instead of EventStrategy.detach
TINKERPOP-2204 Client receives no response on failed request
TINKERPOP-2206 Certain types in javascript don’t appear to serialize with a GraphSON type
TINKERPOP-2212 Path is not detaching properly under certain conditions

Improvements

TINKERPOP-2089 Javascript DSL support
TINKERPOP-2179 Have o.a.t.g.driver.ser.SerializationException extend IOException
TINKERPOP-2181 Allow ctrl+c to break out of a long running process in Gremlin Console
TINKERPOP-2182 Remove gperfutils from Gremlin Console (breaking)
TINKERPOP-2191 Implement EdgeLabelVerificationStrategy
TINKERPOP-2211 Provide API to add per request option for a bytecode

TinkerPop 3.3.6 (Release Date: March 18, 2019)

Docker images use user gremlin instead of root
Added a new ResponseStatusCode for client-side serialization errors.
Refactored use of commons-lang to use common-lang3 only, though dependencies may still use commons-lang.
Bumped commons-lang3 to 3.8.1.
Improved handling of client-side serialization errors that were formerly just being logged rather than being raised.
Add Python TraversalMetrics and Metrics deserializers.
Masked sensitive configuration options in the logs of KryoShimServiceLoader.
Added globalFunctionCacheEnabled to the GroovyCompilerGremlinPlugin to allow that cache to be disabled.
Added globalFunctionCacheEnabled override to SessionOpProcessor configuration.
Added status code to GremlinServerError so that it would be more directly accessible during failures.
Added GraphSON serialization support for Duration, Char, ByteBuffer, Byte, BigInteger and BigDecimal in gremlin-python.
Added ProfilingAware interface to allow steps to be notified that profile() was being called.
Fixed bug where profile() could produce negative timings when group() contained a reducing barrier.
Improved logic determining the dead or alive state of a Java driver Connection.
Improved handling of dead connections and the availability of hosts.
Bumped httpclient to 4.5.7.
Bumped slf4j to 1.7.25.
Bumped commons-codec to 1.12.
Bumped to Groovy 2.5.6.
Bumped to Hadoop 2.7.7.
Fixed partial response failures when using authentication in gremlin-python.
Fixed concurrency issues in TraverserSet.toString() and ObjectWritable.toString().
Fixed a bug in InlineFilterStrategy that mixed up and’s and or’s when folding merging conditions together.
Fixed a bug in PartitionStrategy where addE() as a start step was not applying the partition.
Improved handling of failing Authenticator instances thus improving server responses to drivers.
Improved performance of JavaTranslator by reducing calls to Method.getParameters().
Implemented EarlyLimitStrategy which is supposed to significantly reduce backend operations for queries that use range().
Reduced chance of hash collisions in Bytecode and its inner classes.
Added Symbol.asyncIterator member to the Traversal class to provide support for await … of loops (async iterables).

Bugs

TINKERPOP-2081 PersistedOutputRDD materialises rdd lazily with Spark 2.x
TINKERPOP-2091 Wrong/Missing feature requirements in StructureStandardTestSuite
TINKERPOP-2094 Gremlin Driver Cluster Builder serializer method does not use mimeType as suggested
TINKERPOP-2095 GroupStep looks for irrelevant barrier steps
TINKERPOP-2096 gremlinpython: AttributeError when connection is closed before result is received
TINKERPOP-2100 coalesce() creating unexpected results when used with order()
TINKERPOP-2105 Gremlin-Python connection not returned back to the pool on exception from gremlin server
TINKERPOP-2113 P.Within() doesn’t work when given a List argument

Improvements

TINKERPOP-1889 JavaScript GLV: Use heartbeat to prevent connection timeout
TINKERPOP-2010 Generate jsdoc for gremlin-javascript
TINKERPOP-2013 Process tests that are auto-ignored stink
TINKERPOP-2018 Generate API docs for Gremlin.Net
TINKERPOP-2038 Make groovy script cache size configurable
TINKERPOP-2050 Add a :bytecode command to Gremlin Console
TINKERPOP-2062 Add Traversal class to CoreImports
TINKERPOP-2065 Optimize iterate() for remote traversals
TINKERPOP-2067 Allow getting raw data from Gremlin.Net.Driver.IGremlinClient
TINKERPOP-2068 Bump Jackson Databind 2.9.7
TINKERPOP-2069 Document configuration of Gremlin.Net
TINKERPOP-2070 gremlin-javascript: Introduce Connection representation
TINKERPOP-2071 gremlin-python: the graphson deserializer for g:Set should return a python set
TINKERPOP-2073 Generate tabs for static code blocks
TINKERPOP-2074 Ensure that only NuGet packages for the current version are pushed
TINKERPOP-2077 VertexProgram.Builder should have a default create() method with no Graph
TINKERPOP-2078 Hide use of EmptyGraph or RemoteGraph behind a more unified method for TraversalSource construction
TINKERPOP-2084 For remote requests in console display the remote stack trace
TINKERPOP-2092 Deprecate default GraphSON serializer fields
TINKERPOP-2097 Create a DriverRemoteConnection with an initialized Client
TINKERPOP-2102 Deprecate static fields on TraversalSource related to remoting
TINKERPOP-2106 When gremlin executes timeout, throw TimeoutException instead of TraversalInterruptedException/InterruptedIOException
TINKERPOP-2110 Allow Connection on Different Path (from /gremlin)
TINKERPOP-2114 Document common Gremlin anti-patterns
TINKERPOP-2118 Bump to Groovy 2.4.16
TINKERPOP-2121 Bump Jackson Databind 2.9.8

TinkerPop 3.3.5 (Release Date: January 2, 2019)

This release also includes changes from 3.2.11.

Fixed and/or folding in InlineFilterStrategy.
Fixed configuration and serialization of SubgraphStrategy which was missing the checkAdjacentVertices flag.
Captured TraversalInterruptionException and converted to TimeoutException for GremlinExecutor.
Fixed a bug in CoalesceStep which squared the bulk if the step followed a Barrier step.
Fixed a bug in GroupStep that assigned wrong reducing bi-operators
Added :bytecode command to help developers debugging Bytecode-based traversals.
Added option to set the path for the URI on the Java driver.
Fixed PersistedOutputRDD to eager persist RDD by adding count() action calls.
Deserialized g:Set to a Python Set in GraphSON in gremlin-python.
Deprecated StarGraph.builder() and StarGraph.Builder.build() in favor of the more common "builder" patterns of build() and create() respectively.
Deprecated Serializers.DEFAULT_RESULT_SERIALIZER and DEFAULT_REQUEST_SERIALIZER.
Deprecated TraversalSource#GREMLIN_REMOTE and TraversalSource#GREMLIN_REMOTE_CONNECTION_CLASS moving them to RemoteConnection.
Fixed the setting of the default label for a ReferenceVertex when the original vertex was of type ComputerAdjacentVertex.
Changed Java driver to expect a generic RemoteTraverser object rather than the specific DefaultRemoteTraverser.
Better handled server disconnect condition for the gremlin-python driver by throwing a clear exception.
Display the remote stack trace in the Gremlin Console when scripts sent to the server fail.
Added AnonymousTraversalSource which provides a more unified means of constructing a TraversalSource.
Added DriverRemoteConnection.using(Client) to provide users better control over the number of connections being created.
Changed behavior of GraphSON deserializer in gremlin-python such that g:Set returns a Python Set.
Bumped to Groovy 2.4.16.
Fixed bug that prevented TraversalExplanation from serializing properly with GraphSON.
Changed behavior of iterate() in Python, Javascript and .NET to send none() thus avoiding unnecessary results being returned.
Provided for a configurable class map cache in the GremlinGroovyScriptEngine and exposed that in Gremlin Server.
GraphProvider instances can be annotated with OptOut configurations that will be applied in addition to the OptOut instances on a Graph.

Bugs

TINKERPOP-2081 PersistedOutputRDD materialises rdd lazily with Spark 2.x
TINKERPOP-2091 Wrong/Missing feature requirements in StructureStandardTestSuite
TINKERPOP-2094 Gremlin Driver Cluster Builder serializer method does not use mimeType as suggested
TINKERPOP-2095 GroupStep looks for irrelevant barrier steps
TINKERPOP-2096 gremlinpython: AttributeError when connection is closed before result is received
TINKERPOP-2100 coalesce() creating unexpected results when used with order()
TINKERPOP-2113 P.Within() doesn’t work when given a List argument

Improvements

TINKERPOP-1889 JavaScript GLV: Use heartbeat to prevent connection timeout
TINKERPOP-2010 Generate jsdoc for gremlin-javascript
TINKERPOP-2013 Process tests that are auto-ignored stink
TINKERPOP-2018 Generate API docs for Gremlin.Net
TINKERPOP-2038 Make groovy script cache size configurable
TINKERPOP-2050 Add a :bytecode command to Gremlin Console
TINKERPOP-2062 Add Traversal class to CoreImports
TINKERPOP-2065 Optimize iterate() for remote traversals
TINKERPOP-2067 Allow getting raw data from Gremlin.Net.Driver.IGremlinClient
TINKERPOP-2069 Document configuration of Gremlin.Net
TINKERPOP-2070 gremlin-javascript: Introduce Connection representation
TINKERPOP-2071 gremlin-python: the graphson deserializer for g:Set should return a python set
TINKERPOP-2073 Generate tabs for static code blocks
TINKERPOP-2074 Ensure that only NuGet packages for the current version are pushed
TINKERPOP-2077 VertexProgram.Builder should have a default create() method with no Graph
TINKERPOP-2078 Hide use of EmptyGraph or RemoteGraph behind a more unified method for TraversalSource construction
TINKERPOP-2084 For remote requests in console display the remote stack trace
TINKERPOP-2092 Deprecate default GraphSON serializer fields
TINKERPOP-2097 Create a DriverRemoteConnection with an initialized Client
TINKERPOP-2102 Deprecate static fields on TraversalSource related to remoting
TINKERPOP-2106 When gremlin executes timeout, throw TimeoutException instead of TraversalInterruptedException/InterruptedIOException
TINKERPOP-2110 Allow Connection on Different Path (from /gremlin)
TINKERPOP-2114 Document common Gremlin anti-patterns
TINKERPOP-2118 Bump to Groovy 2.4.16
TINKERPOP-2121 Bump Jackson Databind 2.9.8

TinkerPop 3.3.4 (Release Date: October 15, 2018)

This release also includes changes from 3.2.10.

Added synchronized Map to Gryo 3.0 registrations.
Removed timedInterrupt from documentation as a way to timeout.
Deprecated Order for incr and decr in favor of asc and desc.
Fixed bug in math() for OLAP where ComputerVerificationStrategy was incorrectly detecting path label access and preventing execution.

Bugs

TINKERPOP-1898 Issue with bindings in strategies and lambdas
TINKERPOP-1933 gremlin-python maximum recursion depth exceeded on large responses
TINKERPOP-1958 TinkerGraphCountStrategy can return wrong counts
TINKERPOP-1961 Duplicate copies of images directory in docs
TINKERPOP-1962 GroovyTranslator doesn’t handle empty maps
TINKERPOP-1963 Use of reducing step in choose()
TINKERPOP-1972 inject() tests are throwing exceptions in .NET GLV tests
TINKERPOP-1978 Check for Websocket connection state when retrieved from Connection Pool missing
TINKERPOP-1979 Several OLAP issues in MathStep
TINKERPOP-1988 minor error in documentation
TINKERPOP-1999 [Java][gremlin-driver] Query to a remote server via the websocket client hangs indefinitely if the server becomes unavailable
TINKERPOP-2005 Intermittent NullPointerException in response handling
TINKERPOP-2009 Pick.any and Pick.none should be exposed in Gremlin-JavaScript
TINKERPOP-2021 Prevent maximum recursion depth failure
TINKERPOP-2030 KeepAlive task executed for every Connection.write call
TINKERPOP-2032 Update jython-standalone
TINKERPOP-2044 Cannot reconnect to Azure cosmos host that becomes available again

Improvements

TINKERPOP-1113 GraphComputer subclasses should support native methods
TINKERPOP-1365 Log the seed used to initialize Random in tests
TINKERPOP-1447 Add some JavaScript intelligence to the documentation so that comments and output are not copied in a copy paste
TINKERPOP-1595 Go through TraversalVertexProgram with a profile and optimize.
TINKERPOP-1778 Do not promote timedInterrupt option for Gremlin Server script processing
TINKERPOP-1780 Add authentication tests for gremlin-python
TINKERPOP-1836 .NET sample project
TINKERPOP-1841 Include Python GLV tests on TravisCI
TINKERPOP-1864 Gremlin Python tests for GraphSON 2.0 and 3.0
TINKERPOP-1897 Provide Docker images of Gremlin Server and Console
TINKERPOP-1945 Add support for extended GraphSon types to Gremlin.net
TINKERPOP-1951 gremlin-server.bat doesn’t support paths containing spaces
TINKERPOP-1956 Deprecate Order incr/decr for asc/desc
TINKERPOP-1959 Provide a way to submit scripts to the server in gremlin-javascript
TINKERPOP-1968 Refactor elements of Gremlin Server testing
TINKERPOP-1976 Include Computer tests for GLVs
TINKERPOP-1977 Gremlin-JavaScript: Support SASL authentication
TINKERPOP-1985 Update position on bulk loading
TINKERPOP-1989 Preserve order that plugins are applied in Gremlin Console
TINKERPOP-1995 DriverRemoteConnection close() method returns undefined
TINKERPOP-2011 Use NumberHelper on choose()
TINKERPOP-2012 Target .NET Standard 2.0 for Gremlin.Net
TINKERPOP-2015 Allow users to configure the WebSocket connections
TINKERPOP-2016 Upgrade Jackson FasterXML to 2.9.5 or later to fix security vulnerability
TINKERPOP-2017 Check for Column in by()
TINKERPOP-2022 Cluster SSL should trust default ca certs by default
TINKERPOP-2023 Gremlin Server should not create self-signed certs (breaking)
TINKERPOP-2024 Gremlin Server Application archetype should connect via withRemote
TINKERPOP-2025 Change to SHA-256/512 and drop SHA-1 for releases
TINKERPOP-2026 Gremlin.Net.Driver should check ClientWebSocket.State before closing
TINKERPOP-2034 Register synchronizedMap() with Gryo
TINKERPOP-2035 Gremlin-JavaScript: Pass custom headers to the websocket connection
TINKERPOP-2040 Improve flexibility of GroovyTranslator to handle custom types
TINKERPOP-2045 Remove non-indy groovy dependencies
TINKERPOP-2055 Provide support for special number cases like Infinity in GraphSON
TINKERPOP-2056 Use NumberHelper in Compare

TinkerPop 3.3.3 (Release Date: May 8, 2018)

This release also includes changes from 3.2.9.

Implemented TraversalSelectStep which allows to select() runtime-generated keys.
Coerced BulkSet to g:List in GraphSON 3.0.
Deprecated CredentialsGraph DSL in favor of CredentialsTraversalDsl which uses the recommended method for Gremlin DSL development.
Allowed iterate() to be called after profile().

Bugs

TINKERPOP-1869 Profile step and iterate do not play nicely with each other
TINKERPOP-1927 Gherkin scenario expects list with duplicates, but receives g:Set
TINKERPOP-1947 Path history isn’t preserved for keys in mutations

Improvements

TINKERPOP-1628 Implement TraversalSelectStep
TINKERPOP-1755 No docs for ReferenceElements
TINKERPOP-1903 Credentials DSL should use the Java annotation processor
TINKERPOP-1912 Remove MD5 checksums
TINKERPOP-1934 Bump to latest version of httpclient
TINKERPOP-1936 Performance enhancement to Bytecode deserialization
TINKERPOP-1943 JavaScript GLV: Support GraphSON3
TINKERPOP-1944 JavaScript GLV: DriverRemoteConnection is not exported in the root module
TINKERPOP-1950 Traversal construction performance enhancements
TINKERPOP-1953 Bump to Groovy 2.4.15

TinkerPop 3.3.2 (Release Date: April 2, 2018)

This release also includes changes from 3.2.8.

Fixed regression issue where the HTTPChannelizer doesn’t instantiate the specified AuthenticationHandler.
Defaulted GLV tests for gremlin-python to run for GraphSON 3.0.
Fixed a bug with Tree serialization in GraphSON 3.0.
In gremlin-python, the GraphSON 3.0 g:Set type is now deserialized to List.

Bugs

TINKERPOP-1053 installed plugins are placed in a directory relative to where gremlin.sh is started
TINKERPOP-1509 Failing test case for tree serialization
TINKERPOP-1738 Proper functioning of GraphSONReader depends on order of elements in String representation
TINKERPOP-1758 RemoteStrategy should be before all other DecorationStrategies.
TINKERPOP-1855 Update Rexster links
TINKERPOP-1858 HttpChannelizer regression: Does not create specified AuthenticationHandler
TINKERPOP-1859 Complex instance of P not serializing to bytecode properly
TINKERPOP-1860 valueMap(True) result in error in gremlin-python
TINKERPOP-1862 TinkerGraph VertexProgram message passing doesn’t work properly when using Direction.BOTH
TINKERPOP-1867 union() can produce extra traversers
TINKERPOP-1872 Apply edgeFunction in SparkMessenger
TINKERPOP-1873 min() and max() work only in the range of Integer values
TINKERPOP-1874 P does not appear to be serialized consistently in GraphSON
TINKERPOP-1875 Gremlin-Python only aggregates to list when using GraphSON3
TINKERPOP-1879 Gremlin Console does not resepect equal sign for flag argument assignments
TINKERPOP-1880 Gremlin.NET Strong name signature could not be verified. (HRESULT: 0x80131045)
TINKERPOP-1883 gremlinpython future will never return
TINKERPOP-1890 getAnonymousTraversalClass() is not being generated for Java DSLs
TINKERPOP-1891 Serialization of P.not() for gremlin-javascript
TINKERPOP-1892 GLV test failures for .NET
TINKERPOP-1894 GraphSONMessageSerializerV2d0 fails to deserialize valid P.not()
TINKERPOP-1896 gremlin-python lambdas error
TINKERPOP-1907 Fix failing GLV test for withSack() in .NET
TINKERPOP-1917 gx:BigDecimal serialization broken in Gremlin.Net on systems with ',' as decimal separator
TINKERPOP-1918 Scenarios fail because of wrong numerical types
TINKERPOP-1919 Gherkin runner doesn’t work with P.And() and P.Or() in Gremlin.Net
TINKERPOP-1920 Tests fail because P.Within() arguments are wrapped in an array in Gremlin.Net
TINKERPOP-1922 Gherkin features fail that contain P.not() in Gremlin.Net

Improvements

TINKERPOP-1357 Centrality Recipes should mention pageRank and OLAP.
TINKERPOP-1489 Provide a Javascript Gremlin Language Variant
TINKERPOP-1586 SubgraphStrategy in OLAP
TINKERPOP-1726 Support WebSockets ping/pong keep-alive in Gremlin server
TINKERPOP-1842 iterate() missing in terminal steps documentation
TINKERPOP-1844 Python GLV test should run for GraphSON 3.0 (breaking)
TINKERPOP-1850 Range step has undocumented special values
TINKERPOP-1854 Support lambdas in Gremlin.Net
TINKERPOP-1857 GLV test suite consistency and completeness
TINKERPOP-1863 Delaying the setting of requestId till the RequestMessage instantiation time
TINKERPOP-1865 Run Gremlin .NET GLV tests with GraphSON 3.0
TINKERPOP-1866 Support g:T for .NET
TINKERPOP-1868 Support inject source step in Gremlin.Net
TINKERPOP-1870 n^2 synchronious operation in OLAP WorkerExecutor.execute() method
TINKERPOP-1871 Exception handling is slow in element ReferenceElement creation
TINKERPOP-1877 Add new graph data for specialized testing scenarios
TINKERPOP-1884 Bump to Netty 4.0.56.Final
TINKERPOP-1885 Various Gremlin.Net documentation updates
TINKERPOP-1901 Enable usage of enums in more steps in Gremlin.Net
TINKERPOP-1908 Bump to Groovy 2.4.14
TINKERPOP-1911 Refactor JavaTranslator to cache all reflective calls
TINKERPOP-1914 Support construct a GremlinServer instance from gremlin executor service

TinkerPop 3.3.1 (Release Date: December 17, 2017)

This release also includes changes from 3.2.7.

Added NoneStep and Traversal.none() for full filtering integration with iterate().
Fixed bug in serialization of Path for GraphSON 3.0 in gremlin-python.
Added support for GraphSON 3.0 in Gremlin.Net.
Added math()-step which supports scientific calculator capabilities for numbers within a traversal.
Added missing GraphTraversalSource.addE()-method to GremlinDslProcessor.
Changed to() and from() traversal-based steps to take a wildcard ? instead of of E.
Added addV(traversal) and addE(traversal) so that created element labels can be determined dynamically.
PageRankVertexProgram supports maxIterations but will break out early if epsilon-based convergence occurs.
Added support for epsilon-based convergence in PageRankVertexProgram.
Fixed two major bugs in how PageRank was being calculated in PageRankVertexProgram.
Added Io.requiresVersion(Object) to allow graph providers a way to check the Io type and version being constructed.
Defaulted IoCore.gryo() and IoCore.graphson() to both use their 3.0 formats which means that Graph.io() will use those by default.
Bumped Neo4j 3.2.3

Bugs

TINKERPOP-1773 Lop should be created as a "software" and not a "person"
TINKERPOP-1783 PageRank gives incorrect results for graphs with sinks (breaking)
TINKERPOP-1799 Failure to serialize path() in gremlin-python
TINKERPOP-1847 tinkergraph-gremlin dependency on gremlin-test, bad scope?

Improvements

TINKERPOP-1632 Create a set of default functions
TINKERPOP-1692 Bump to Neo4j 3.2.3
TINKERPOP-1717 Update name and link of DynamoDB storage backend in landing page
TINKERPOP-1730 Gremlin .NET support for GraphSON 3.0
TINKERPOP-1767 Method for graph providers to check an IO version and type
TINKERPOP-1793 addE() should allow dynamic edge labels
TINKERPOP-1834 Consider iterate() as a first class step

TinkerPop 3.3.0 (Release Date: August 21, 2017)

This release also includes changes from 3.2.6.

Removed previously deprecated ScriptElementFactory.
Added GraphTraversalSource.addE(String) in support of g.addE().from().to().
Added support for to(Vertex) and from(Vertex) as a shorthand for to(V(a)) and from(V(b)).
Bumped to support Spark 2.2.0.
Detected if type checking was required in GremlinGroovyScriptEngine and disabled related infrastructure if not.
Removed previously deprecated GraphTraversal.selectV3d0() step.
Removed previously deprecated DetachedEdge(Object,String,Map,Pair,Pair) constructor.
Removed previously deprecated Bindings constructor. It is now a private constructor.
Removed previously deprecated TraversalSource.withBindings().
Removed previously deprecated GraphTraversal.sack(BiFunction,String).
TraversalMetrics and Metrics Gryo 1.0 formats changed given internal changes to their implementations.
Made TraversalMetrics safe to write to from multiple threads.
Removed previously deprecated TraversalSideEffects methods.
Removed previously deprecated finalization.LazyBarrierStrategy (moved to optimization.LazyBarrierStrategy).
Removed previously deprecated Constants in Hadoop.
Removed previously deprecated VertexComputing.generateComputer(Graph).
Removed previously deprecated ConfigurationTraversal.
Established the Gryo 3.0 format.
GryoVersion now includes a default ClassResolver to supply to the GryoMapper.
GryoClassResolver renamed to GryoClassResolverV1d0 which has an abstract class that for providers to extend in AbstractGryoClassResolver.
Removed previously deprecated Order enums of keyIncr, keyDecr, valueIncr, and valueDecr.
Removed previously deprecated GraphTraversal.mapKeys() step.
Removed previously deprecated GraphTraversal.mapValues() step.
Removed previously deprecated GraphTraversal#addV(Object…).
Removed previously deprecated GraphTraversal#addE(Direction, String, String, Object…).
Removed previously deprecated GraphTraversal#addOutE(String, String, Object…).
Removed previously deprecated GraphTraversal#addInV(String, String, Object…).
Removed previously deprecated GraphTraversal.groupV3d0() and respective GroupSideEffectStepV3d0 and GroupStepV3d0.
Removed previously deprecated TraversalSource.Builder class.
Removed previously deprecated ConnectiveP, AndP, OrP constructors.
Removed previously deprecated TraversalScriptFunction class.
Removed previously deprecated TraversalScriptHelper class.
Removed previously deprecated ScriptEngineCache class.
Removed previously deprecated CoreImports class.
Removed previously deprecated GremlinJythonScriptEngine#() constructor.
Removed access to previously deprecated CoreGremlinPlugin#INSTANCE field.
gremlin.sh and gremln.bat no longer support the option to pass a script as an argument for execution mode without using the -i option.
Graphite and Ganglia are no longer packaged with the Gremlin Server distribution.
TransactionException is no longer a class of AbstractTransaction and it extends RuntimeException.
Included an ellipse on long property names that are truncated.
Renamed RangeByIsCountStrategy to CountStrategy.
Added more specific typing to various __ traversal steps. E.g. <A,Vertex>out() is <Vertex,Vertex>out().
Updated Docker build scripts to include Python dependencies (NOTE: users should remove any previously generated TinkerPop Docker images).
Added "attachment requisite" VertexProperty.element() and Property.element() data in GraphSON serialization.
GraphSON 3.0 is now the default serialization format in TinkerGraph and Gremlin Server.
Changed ServerGremlinExecutor to not use generics since there really is no flexibility in the kind of ScheduledExecutorService that will be used.
Removed support for passing a byte array on the sasl parameter.
Removed previously deprecated GraphSONMapper$Builder#embedTypes option.
Removed previously deprecated :remote config timeout max.
Removed previously deprecated ConnectionPoolSettings.sessionId and ConnectionPoolSettings.optionalSessionId().
Removed previously deprecated reconnectInitialDelay setting from the Java driver.
Removed previously deprecated useMapperFromGraph option.
Established the GraphSON 3.0 format with new g:Map, g:List and g:Set types.
Removed previously deprecated Io.Builder#registry(IoRegistry) method.
Removed previously deprecated GryoMessageSerializerV1d0(GryoMapper) constructor.
Removed previously deprecated TinkerIoRegistry.
Removed previously deprecated getInstance() methods on all TinkerPop classes.
Removed previously deprecated VertexPropertyFeatures.supportsAddProperty().
Removed previously deprecated TinkerGraph configuration member variables.
Removed previously deprecated Transaction.submit(Function).
Removed previously deprecated OpSelectorHandler.errorMeter and AbstractEvalOpProcessor.errorMeter fields.
Removed previously deprecated AbstractEvalOpProcessor.validBindingName field.
Removed previously deprecated SimpleAuthenticator.CONFIG_CREDENTIALS_LOCATION field.
Removed previously deprecated IteratorHandler, NioGremlinResponseEncoder and WsGremlinResponseEncoder classes.
Removed previously deprecated Session.kill() and Session.manualKill().
Removed previously deprecated Authenticator.newSaslNegotiator() and its method implementations in classes that were assignable to that interface.
Removed gremlin-groovy-test.
Removed previously deprecated "G" functions in gremlin-groovy (i.e. GFunction).
Removed references to the old GremlinPlugin system that was in gremlin-groovy - the revised GremlinPlugin system in gremlin-core is the only one now in use.
GremlinGroovyScriptEngine no longer implements the now removed DependencyManager.
Added Vertex, Edge, VertexProperty, and Property serializers to Gremlin-Python and exposed tests that use graph object arguments.
Bytecode.getSourceInstructions() and Bytecode.getStepInstructions() now returns List<Instruction> instead of Iterable<Instruction>.
Added various TraversalStrategy registrations with GryoMapper.
Fixed a naming mistake in Gremlin-Python: IdentityRemoveStrategy is now called IdentityRemovalStrategy.
Added TranslationStrategy test infrastructure that verifies Bytecode generated from a translation is equal to the original Bytecode.
Moved NumberHelper into the org.apache.tinkerpop.gremlin.util package.
Added Pop.mixed instead of using null to represent such semantics.
select()-step now defaults to using Pop.last instead of Pop.mixed.
Added gremlin-io-test module to validate IO formats.
RequestMessage and ResponseMessage are now registered with GryoMapper as part of the TinkerPop range of type identifiers.
Removed previously deprecated Console constructor that took a String as an argument from gremlin-console.
Removed previously deprecated ConcurrentBindings from gremlin-groovy.
Removed previously deprecated ScriptExecutor from gremlin-groovy.
Removed previously deprecated SandboxExtension from gremlin-groovy.
Removed previously deprecated GremlinGroovyScriptEngine constructor that took ImportCustomizerProvider as an argument from gremlin-groovy.
Removed previously deprecated GremlinGroovyScriptEngine#plugins() from gremlin-groovy.
Added OptionalStep for use with optional() to better handle issues associated with branch side-effects.
UnfoldStep now supports unfolding of arrays.
Removed all performance tests that were not part of gremlin-benchmark.
Removed dependency on junit-benchmarks and it’s related reference to h2.
Moved the source for the "home page" into the repository under /site so that it easier to accept contributions.
Added UnshadedKryoShimService as the new default serializer model for SparkGraphComputer.
GryoRegistrator is more efficient than the previous GryoSerializer model in SparkGraphComputer.
Added support for IoRegistry custom serialization in Spark/Giraph and provided a general hadoop-gremlin test suite.
Replaced term REST with HTTP to remove any confusion as to the design of the API.
Moved gremlin-benchmark under gremlin-tools module.
Added gremlin-tools and its submodule gremlin-coverage.
Removed tryRandomCommit() from AbstractGremlinTest.
Changed gremlin-benchmark system property for the report location to benchmarkReportDir for consistency.
Added SysV and systemd init scripts.
GraphTraversal.valueMap(includeTokens,propertyKeys…) now returns a Map<Object,E> since keys could be T.id or T.label.
Added skip(long) and skip((Scope,long) which call the range(low,high) equivalents with -1 as the high.
Added Kerberos authentication to gremlin-server for websockets and nio transport.
Added audit logging of authenticated users and gremlin queries to gremlin-server.

Bugs

TINKERPOP-1211 UnfoldStep should unfold arrays. (breaking)
TINKERPOP-1426 GryoSerializer should implement Java serialization interface
TINKERPOP-1465 Remove deprecated newSaslNegotiator (breaking)
TINKERPOP-1483 PropertyMapStep returns Map<String,E> but puts non String keys in it!
TINKERPOP-1520 Difference between 'has' step generated graphson2.0 in java and python glv implementation
TINKERPOP-1533 Storage and IoRegistry
TINKERPOP-1597 PathRetractionStrategy messing up certain traversals
TINKERPOP-1635 gremlin-python: Duplicate serialization of element property in PropertySerializer
TINKERPOP-1658 Graphson2 map keys are serialised as strings
TINKERPOP-1716 Traversal strategies are not applied with remote in Gremlin Console

Improvements

TINKERPOP-832 Remove deprecated addV/E/InE/OutE methods (breaking)
TINKERPOP-833 Remove deprecated GremlinGroovyScriptEngine constructor and plugins() (breaking)
TINKERPOP-834 Remove deprecated sack() method (breaking)
TINKERPOP-880 Remove deprecated GroupStepV3d0 and GroupSideEffectStepV3d0 (breaking)
TINKERPOP-929 Remove Deprecated TinkerGraph public static methods. (breaking)
TINKERPOP-980 Add a service script or daemon mode in the distribution (breaking)
TINKERPOP-999 ServerGremlinExecutor construction need not use generics for ExecutorService (breaking)
TINKERPOP-1004 Make Transaction.commit() failures consistent across implementations. (breaking)
TINKERPOP-1010 Remove deprecated credentialsDbLocation for SimpleAuthenticator (breaking)
TINKERPOP-1024 Remove deprecated tryRandomCommit() (breaking)
TINKERPOP-1028 Remove deprecated ConnectionPoolSettings session settings (breaking)
TINKERPOP-1040 Remove deprecated SandboxExtension (breaking)
TINKERPOP-1046 Remove deprecated Gremlin Server handler implementations (breaking)
TINKERPOP-1049 Remove deprecated error meter member variables in Gremlin Server handlers (breaking)
TINKERPOP-1094 Remove deprecated VertexPropertyFeatures.FEATURE_ADD_PROPERTY (breaking)
TINKERPOP-1116 Some anonymous traversal steps can be hard typed. (breaking)
TINKERPOP-1130 Each release should store Kryo/GraphSON/GraphML versions to ensure future compatibility (breaking)
TINKERPOP-1142 Remove deprecated valueIncr, valueDecr, keyIncr, keyDecr. (breaking)
TINKERPOP-1169 Remove deprecated TraversalScriptFunction and TraversalScriptHelper (breaking)
TINKERPOP-1170 Remove deprecated ConfigurationTraversal. (breaking)
TINKERPOP-1171 Remove deprecated TraversalSource.Builder (breaking)
TINKERPOP-1235 Remove deprecated ProcessPerformanceSuite and TraversalPerformanceTest (breaking)
TINKERPOP-1275 Remove deprecated max setting for :remote (breaking)
TINKERPOP-1283 Remove deprecated ScriptExecutor (breaking)
TINKERPOP-1289 Remove deprecated ConnectiveP, AndP, and OrP constructors. (breaking)
TINKERPOP-1291 Remove deprecated mapValues and mapKeys methods (breaking)
TINKERPOP-1313 Rename RangeByIsCountStrategy (breaking)
TINKERPOP-1316 Remove deprecated constructor from GryoMessageSerializers (breaking)
TINKERPOP-1327 Bring GryoRegistrator to the forefront and deprecate GryoSerializer (breaking)
TINKERPOP-1363 Cleanup Docker build script for next major release (breaking)
TINKERPOP-1369 Replace REST API with HTTP API
TINKERPOP-1389 Support Spark 2.0.0
TINKERPOP-1399 NumberHelper needs to go into util and have a private constructor (breaking)
TINKERPOP-1404 Path/label optimization
TINKERPOP-1408 Remove Deprecated Io.Builder.registry() (breaking)
TINKERPOP-1414 Change default GraphSON version to 3.0 (breaking)
TINKERPOP-1420 Remove deprecated ConcurrentBindings in gremlin-groovy (breaking)
TINKERPOP-1421 Remove deprecated ControlOps (breaking)
TINKERPOP-1427 GraphSON 3.0 needs collection types and consistent number typing.
TINKERPOP-1443 Use an API checker during build
TINKERPOP-1445 Large nested VertexProperties and Properties do not get printed well
TINKERPOP-1454 Create Serializers for Graph objects in Gremlin-Python
TINKERPOP-1481 Remove deprecated reconnectInitialDelay in Java driver (breaking)
TINKERPOP-1485 Move source for TinkerPop site to source code repo
TINKERPOP-1506 Optional/Coalesce should not allow sideEffect traversals.
TINKERPOP-1514 Restructure for gremlin-tools module (breaking)
TINKERPOP-1524 Bytecode.getXXXInstructions should return a List, not Iterable.
TINKERPOP-1526 Remove deprecated Session kill() overloads (breaking)
TINKERPOP-1536 Include GLVs in Docker build
TINKERPOP-1541 Select should default to Pop.last semantics (breaking)
TINKERPOP-1549 Implement skip()
TINKERPOP-1550 Make Graphite and Ganglia optional dependencies
TINKERPOP-1563 Remove deprecated getInstance() methods (breaking)
TINKERPOP-1565 Setup GraphSON 3.0
TINKERPOP-1566 Kerberos authentication for gremlin-server
TINKERPOP-1574 Get rid of untyped GraphSON in 3.0
TINKERPOP-1603 Remove support for SASL byte array in protocol (breaking)
TINKERPOP-1612 Remove gremlin-groovy-test module (breaking)
TINKERPOP-1621 Remove deprecated GremlnPlugin and related infrastructure (breaking)
TINKERPOP-1622 Remove deprecated G functions in gremlin-groovy (breaking)
TINKERPOP-1651 Remove deprecated gremlin.sh init syntax (breaking)
TINKERPOP-1686 Make TraversalMetrics thread safe (breaking)
TINKERPOP-1698 Gryo 3.0
TINKERPOP-1699 Remove deprecated userMapperFromGraph (breaking)
TINKERPOP-1700 Remove deprecated embedTypes option
TINKERPOP-1706 Remove deprecated ScriptEngineCache and related dead code (breaking)
TINKERPOP-1715 Bump to Spark 2.2
TINKERPOP-1719 Remove deprecated Traversal related code (breaking)
TINKERPOP-1720 Remove deprecated Hadoop code (breaking)
TINKERPOP-1721 Remove deprecated Bindings related code (breaking)
TINKERPOP-1724 Remove deprecated ScriptElementFactory
TINKERPOP-1729 Remove deprecated select steps.
TINKERPOP-1740 Add vertex parameter overload to to() and from()
TINKERPOP-1747 Streamline inheritance for gremlin-python GraphSON serializer classes

TinkerPop 3.2.0 (Nine Inch Gremlins)

TinkerPop 3.2.11 (Release Date: January 2, 2019)

Bumped to Jackson Databind 2.9.8

Improvements

TINKERPOP-2074 Ensure that only NuGet packages for the current version are pushed
TINKERPOP-2121 Bump Jackson Databind 2.9.8

TinkerPop 3.2.10 (Release Date: October 15, 2018)

Removed conflicting non-indy groovy core dependency
Bumped jython-standalone 2.7.1
Added a delegate to the Gremlin.Net driver that can be used to configure the WebSocket connection.
SSL security enhancements
Added Gremlin version to Gremlin Server startup logging output.
Fixed problem with Gremlin Server sometimes returning an additional message after a failure.
Allowed spaces in classpath for gremlin-server.bat.
Fixed bug in traversals that used Python lambdas with strategies in gremlin-python.
Modified Maven archetype for Gremlin Server to use remote traversals rather than scripts.
Added an system error code for failed plugin installs for Gremlin Server -i option.
Fixed bug in keep-alive requests from over-queuing cancelled jobs.
Match numbers in choose() options using NumberHelper (match values, ignore data type).
Added support for GraphSON serialization of Date in Javascript.
Added synchronized Map to Gryo 1.0 registrations.
Added Triple to Gryo 1.0 registrations.
Added support for Double.NaN, Double.POSITIVE_INFINITY and Double.NEGATIVE_INFINITY.
Improved escaping of special characters in strings passed to the GroovyTranslator.
Added Cluster configuration option to set a custom validation script to use to test server connectivity in the Java driver.
Improved ability of GroovyTranslator to handle more types supported by GraphSON.
Improved ability of GroovyTranslator to handle custom types.
Added better internal processing of Column in by(Function).
Added hasNext() support on Traversal for gremlin-python.
Added support for additional extended types in Gremlin.Net with decimal, TimeSpan, BigInteger, byte, byte[], char and short.
Fixed bug in Java driver where an disorderly shutdown of the server would cause the client to hang.
Added a dotnet template project that should make it easier to get started with Gremlin.Net.
Removed ThreadInterruptCustomizerProvider from documentation as a way to timeout.
Changed behavior of withRemote() if called multiple times so as to simply throw an exception and not perform the side-effect of auto-closing.
Added Docker images for Gremlin Console and Gremlin Server.
Fixed bug in branch() where reducing steps as options would produce incorrect results.
Removed recursive handling of streaming results from Gremlin-Python driver to avoid max recursion depth errors.
Improved performance of TraversalVertexProgram and related infrastructure.
Checked web socket state before closing connection in the .NET driver.
Deprecated BulkLoaderVertexProgram and related infrastructure.
Deprecated BulkDumperVertexProgram with the more aptly named CloneVertexProgram.
Added createGratefulDead() to TinkerFactory to help make it easier to try to instantiate that toy graph.
Added identifiers to edges in the Kitchen Sink toy graph.
Ordered the loading of plugins in the Gremlin Console by their position in the configuration file.
Refactored the Gremlin Server integration testing framework and streamlined that infrastructure.
Logged the seed used in initializing Random for tests.
Fixed bug in GroovyTranslator that didn’t properly handle empty Map objects.
Added concrete configuration methods to SparkGraphComputer to make a more clear API for configuring it.
Fixed a bug in TinkerGraphCountStrategy, which didn’t consider that certain map steps may not emit an element.
Fixed a bug in JavaScript GLV where DriverRemoteConnection close() method didn’t returned a Promise instance.
Bumped to Jackson 2.9.6.
Sasl Plain Text Authentication added to Gremlin Javascript.
Ability to send scripts to server added to Gremlin Javascript.
Translator class added to Gremlin Javascript to translate bytecode to script clientside.

Bugs

TINKERPOP-1898 Issue with bindings in strategies and lambdas
TINKERPOP-1933 gremlin-python maximum recursion depth exceeded on large responses
TINKERPOP-1958 TinkerGraphCountStrategy can return wrong counts
TINKERPOP-1961 Duplicate copies of images directory in docs
TINKERPOP-1962 GroovyTranslator doesn’t handle empty maps
TINKERPOP-1963 Use of reducing step in choose()
TINKERPOP-1972 inject() tests are throwing exceptions in .NET GLV tests
TINKERPOP-1978 Check for Websocket connection state when retrieved from Connection Pool missing
TINKERPOP-1988 minor error in documentation
TINKERPOP-1999 [Java][gremlin-driver] Query to a remote server via the websocket client hangs indefinitely if the server becomes unavailable
TINKERPOP-2005 Intermittent NullPointerException in response handling
TINKERPOP-2009 Pick.any and Pick.none should be exposed in Gremlin-JavaScript
TINKERPOP-2030 KeepAlive task executed for every Connection.write call
TINKERPOP-2032 Update jython-standalone
TINKERPOP-2044 Cannot reconnect to Azure cosmos host that becomes available again

Improvements

TINKERPOP-1113 GraphComputer subclasses should support native methods
TINKERPOP-1365 Log the seed used to initialize Random in tests
TINKERPOP-1595 Go through TraversalVertexProgram with a profile and optimize.
TINKERPOP-1778 Do not promote timedInterrupt option for Gremlin Server script processing
TINKERPOP-1780 Add authentication tests for gremlin-python
TINKERPOP-1836 .NET sample project
TINKERPOP-1841 Include Python GLV tests on TravisCI
TINKERPOP-1897 Provide Docker images of Gremlin Server and Console
TINKERPOP-1945 Add support for extended GraphSon types to Gremlin.net
TINKERPOP-1951 gremlin-server.bat doesn’t support paths containing spaces
TINKERPOP-1959 Provide a way to submit scripts to the server in gremlin-javascript
TINKERPOP-1968 Refactor elements of Gremlin Server testing
TINKERPOP-1976 Include Computer tests for GLVs
TINKERPOP-1977 Gremlin-JavaScript: Support SASL authentication
TINKERPOP-1985 Update position on bulk loading
TINKERPOP-1989 Preserve order that plugins are applied in Gremlin Console
TINKERPOP-1995 DriverRemoteConnection close() method returns undefined
TINKERPOP-2011 Use NumberHelper on choose()
TINKERPOP-2012 Target .NET Standard 2.0 for Gremlin.Net
TINKERPOP-2015 Allow users to configure the WebSocket connections
TINKERPOP-2016 Upgrade Jackson FasterXML to 2.9.5 or later to fix security vulnerability
TINKERPOP-2017 Check for Column in by()
TINKERPOP-2022 Cluster SSL should trust default ca certs by default
TINKERPOP-2023 Gremlin Server should not create self-signed certs (breaking)
TINKERPOP-2024 Gremlin Server Application archetype should connect via withRemote
TINKERPOP-2025 Change to SHA-256/512 and drop SHA-1 for releases
TINKERPOP-2026 Gremlin.Net.Driver should check ClientWebSocket.State before closing
TINKERPOP-2034 Register synchronizedMap() with Gryo
TINKERPOP-2035 Gremlin-JavaScript: Pass custom headers to the websocket connection
TINKERPOP-2040 Improve flexibility of GroovyTranslator to handle custom types
TINKERPOP-2045 Remove non-indy groovy dependencies
TINKERPOP-2055 Provide support for special number cases like Infinity in GraphSON
TINKERPOP-2056 Use NumberHelper in Compare

TinkerPop 3.2.9 (Release Date: May 8, 2018)

Fixed bug where path history was not being preserved for keys in mutations.
Bumped to httpclient 4.5.5.
Bumped to Groovy 2.4.15 - fixes bug with Lambda construction.
Improved performance of GraphSON deserialization of Bytecode.
Improved performance of traversal construction.

Bugs

TINKERPOP-1947 Path history isn’t preserved for keys in mutations

Improvements

TINKERPOP-1755 No docs for ReferenceElements
TINKERPOP-1912 Remove MD5 checksums
TINKERPOP-1934 Bump to latest version of httpclient
TINKERPOP-1936 Performance enhancement to Bytecode deserialization
TINKERPOP-1944 JavaScript GLV: DriverRemoteConnection is not exported in the root module
TINKERPOP-1950 Traversal construction performance enhancements
TINKERPOP-1953 Bump to Groovy 2.4.15

TinkerPop 3.2.8 (Release Date: April 2, 2018)

Added a Lambda class to Gremlin.Net that makes it possible to use Groovy and Python lambdas with Gremlin.Net.
Enums are now represented as classes in Gremlin.Net which allows to use them as arguments in more steps.
Bumped to Groovy 2.4.14.
Added checkAdjacentVertices option to SubgraphStrategy.
Modified GremlinDslProcessor so that it generated the getAnonymousTraversalClass() method to return the DSL version of __.
Added the "Kitchen Sink" test data set.
Fixed deserialization of P.not() for GraphSON.
Bumped to Jackson 2.9.4.
Improved performance of JavaTranslator by caching reflected methods required for traversal construction.
Ensure that RemoteStrategy is applied before all other DecorationStrategy instances.
Added idleConnectionTimeout and keepAliveInterval to Gremlin Server that enables a "ping" and auto-close for seemingly dead clients.
Fixed a bug where lambdas in gremlin-python would trigger a failure if steps using python-only symbols were present (such as as_()).
Fixed a bug in NumberHelper that led to wrong min/max results if numbers exceeded the Integer limits.
Delayed setting of the request identifier until RequestMessage construction by the builder.
ReferenceElement avoids UnsupportedOperationException handling in construction thus improving performance.
Improved error messaging for failed serialization and deserialization of request/response messages.
Fixed handling of Direction.BOTH in Messenger implementations to pass the message to the opposite side of the StarGraph.
Removed hardcoded expectation in metrics serialization test suite as different providers may have different outputs.
Added IndexedTraverserSet which indexes on the value of a Traverser thus improving performance when used.
Utilized IndexedTraverserSet in TraversalVertexProgram to avoid extra iteration when doing Vertex lookups.
Bumped to Netty 4.0.56.Final.
Fixed .NET GraphSON serialization of P.Within() and P.without() when passing a Collection as an argument.
Fixed a bug in Gremlin Console which prevented handling of gremlin.sh flags that had an "=" between the flag and its arguments.
Fixed bug where SparkMessenger was not applying the edgeFunction from MessageScope.
Fixed a bug in ComputerAwareStep that didn’t handle reset() properly and thus occasionally produced some extra traversers.
Removed TraversalPredicate class in Gremlin.Net. It is now included in the P class instead.

Bugs

TINKERPOP-1053 installed plugins are placed in a directory relative to where gremlin.sh is started
TINKERPOP-1509 Failing test case for tree serialization
TINKERPOP-1738 Proper functioning of GraphSONReader depends on order of elements in String representation
TINKERPOP-1758 RemoteStrategy should be before all other DecorationStrategies.
TINKERPOP-1855 Update Rexster links
TINKERPOP-1859 Complex instance of P not serializing to bytecode properly
TINKERPOP-1860 valueMap(True) result in error in gremlin-python
TINKERPOP-1862 TinkerGraph VertexProgram message passing doesn’t work properly when using Direction.BOTH
TINKERPOP-1867 union() can produce extra traversers
TINKERPOP-1872 Apply edgeFunction in SparkMessenger
TINKERPOP-1873 min() and max() work only in the range of Integer values
TINKERPOP-1874 P does not appear to be serialized consistently in GraphSON
TINKERPOP-1879 Gremlin Console does not resepect equal sign for flag argument assignments
TINKERPOP-1880 Gremlin.NET Strong name signature could not be verified. (HRESULT: 0x80131045)
TINKERPOP-1883 gremlinpython future will never return
TINKERPOP-1890 getAnonymousTraversalClass() is not being generated for Java DSLs
TINKERPOP-1891 Serialization of P.not() for gremlin-javascript
TINKERPOP-1892 GLV test failures for .NET
TINKERPOP-1894 GraphSONMessageSerializerV2d0 fails to deserialize valid P.not()
TINKERPOP-1896 gremlin-python lambdas error
TINKERPOP-1907 Fix failing GLV test for withSack() in .NET
TINKERPOP-1917 gx:BigDecimal serialization broken in Gremlin.Net on systems with ',' as decimal separator
TINKERPOP-1918 Scenarios fail because of wrong numerical types
TINKERPOP-1919 Gherkin runner doesn’t work with P.And() and P.Or() in Gremlin.Net
TINKERPOP-1920 Tests fail because P.Within() arguments are wrapped in an array in Gremlin.Net
TINKERPOP-1922 Gherkin features fail that contain P.not() in Gremlin.Net

Improvements

TINKERPOP-1357 Centrality Recipes should mention pageRank and OLAP.
TINKERPOP-1489 Provide a Javascript Gremlin Language Variant
TINKERPOP-1586 SubgraphStrategy in OLAP
TINKERPOP-1726 Support WebSockets ping/pong keep-alive in Gremlin server
TINKERPOP-1842 iterate() missing in terminal steps documentation
TINKERPOP-1850 Range step has undocumented special values
TINKERPOP-1854 Support lambdas in Gremlin.Net
TINKERPOP-1857 GLV test suite consistency and completeness
TINKERPOP-1863 Delaying the setting of requestId till the RequestMessage instantiation time
TINKERPOP-1868 Support inject source step in Gremlin.Net
TINKERPOP-1870 n^2 synchronious operation in OLAP WorkerExecutor.execute() method
TINKERPOP-1877 Add new graph data for specialized testing scenarios
TINKERPOP-1884 Bump to Netty 4.0.56.Final
TINKERPOP-1885 Various Gremlin.Net documentation updates
TINKERPOP-1901 Enable usage of enums in more steps in Gremlin.Net
TINKERPOP-1908 Bump to Groovy 2.4.14
TINKERPOP-1911 Refactor JavaTranslator to cache all reflective calls

TinkerPop 3.2.7 (Release Date: December 17, 2017)

Added core GraphSON classes for Gremlin-Python: UUID, Date, and Timestamp.
Documented the recommended method for constructing DSLs with Gremlin.Net.
Provided a method to configure detachment options with EventStrategy.
Fixed a race condition in TinkerIndex.
Fixed bug in handling of the long forms of -e and -i (--execute and --interactive respectively) for Gremlin Console.
Fixed bug in LambdaRestrictionStrategy where traversals using Lambda scripts weren’t causing the strategy to trigger.
Improved error messaging for bytecode deserialization errors in Gremlin Server.
Fixed an ArrayOutOfBoundsException in hasId() for the rare situation when the provided collection is empty.
Bumped to Netty 4.0.53
TraversalVertexProgram profile() now accounts for worker iteration in GraphComputer OLAP.
Returned the Builder instance from the DetachedEdge.Builder methods of setOutE and setOutV.
Added test framework for GLVs.
Fixed bug in TraversalHelper.replaceStep() where the step being replaced needed to be removed prior to the new one being added.
Added alias support in the .NET DriverRemoteConnection.
Added a test for self-edges and fixed Neo4jVertex to provided repeated self-edges on BOTH.
Better respected permissions on the plugins.txt file and prevented writing if marked as read-only.
Added getters for the lambdas held by LambdaCollectingBarrierStep, LambdaFlatMapStep and LambdaSideEffectStep.
Fixed an old hack in GroovyTranslator and PythonTranslator where Elements were being mapped to their id only.
Fixed an "attachement"-bug in InjectStep with a solution generalized to StartStep.
Truncate the script in error logs and error return messages for "Method code too large" errors in Gremlin Server.
Fixed a bug in LambdaRestrictionStrategy where it was too eager to consider a step as being a lambda step.
ReferenceVertex was missing its label() string. ReferenceElement now supports all label handling.
Fixed a bug where bytecode containing lambdas would randomly select a traversal source from bindings.
Deprecated GremlinScriptEngine.eval() methods and replaced them with new overloads that include the specific TraversalSource to bind to.
Added GraphHelper.cloneElements(Graph original, Graph clone) to the gremlin-test module to quickly clone a graph.
Added GremlinDsl.AnonymousMethod annotation to help provide explicit types for anonymous methods when the types are not easily inferred.
Bumped to GMavenPlus 1.6.
Added better error message for illegal use of repeat()-step.
Fixed a bug in RangeByIsCountStrategy that led to unexpected behaviors when predicates were used with floating point numbers.
Bumped to Jackson 2.8.10.
Deprecated MutationListener.vertexPropertyChanged() method that did not use VertexProperty and added a new method that does.
Added an EmbeddedRemoteConnection so that it’s possible to mimic a remote connection within the same JVM.
Supported interruption for remote traversals.
Allow the :remote command to accept a Cluster object defined in the console itself.
The Console’s plugin.txt file is only updated if there were manually uninstalled plugins.
Fixed a bug in MatchStep where mid-traversal where() variables were not being considered in start-scope.
Generalized MatchStep to locally compute all clauses with barriers (not just reducing barriers).
Ensured that plugins were applied in the order they were configured.
Fixed a bug in Neo4jGremlinPlugin that prevented it from loading properly in the GremlinPythonScriptEngine.
Fixed a bug in ComputerVerificationStrategy where child traversals were being analyzed prior to compilation.
Fixed a bug that prevented Gremlin from ordering lists and streams made of mixed number types.
Fixed a bug where keepLabels were being corrupted because a defensive copy was not being made when they were being set by PathRetractionStrategy.
Cancel script evaluation timeout in GremlinExecutor when script evaluation finished.
Added a recipe for OLAP traversals with Spark on YARN.
Added spark-yarn dependencies to the manifest of spark-gremlin.

Bugs

TINKERPOP-1650 PathRetractionStrategy makes Match steps unsolvable
TINKERPOP-1731 Docker build does not appear to work for gremlin-dotnet
TINKERPOP-1745 Gremlin .NET: Use DateTimeOffset instead of DateTime to represent g:Date
TINKERPOP-1753 OrderStep not able to order by non-integer numbers
TINKERPOP-1760 OLAP compilation failing around ConnectiveStrategy
TINKERPOP-1761 GremlinExecutor: Timeout future not cancelled on successful script evaluation
TINKERPOP-1762 Make MatchStep analyze mid-clause variables for executing ordering purposes.
TINKERPOP-1764 Generalize MatchStep to localize all barriers, not just reducing barriers.
TINKERPOP-1766 Gremlin.Net: Closed connections should not be re-used
TINKERPOP-1782 RangeByIsCountStrategy doesn’t handle floating point numbers properly
TINKERPOP-1789 Reference elements should be represented by id and label (breaking)
TINKERPOP-1790 GraphSON 3.0 doc updates
TINKERPOP-1791 GremlinDsl custom step with generic end type produces invalid code in __.java
TINKERPOP-1792 Random TraversalSource Selection in GremlinScriptEngine
TINKERPOP-1795 Getting Lambda comparator message for .profile() step
TINKERPOP-1796 Driver connection pool SSL properties missing
TINKERPOP-1797 LambdaRestrictionStrategy and LambdaMapStep in by()-modulation.
TINKERPOP-1798 MutationListener.vertexPropertyChanged oldValue should be a VertexProperty
TINKERPOP-1801 OLAP profile() step return incorrect timing
TINKERPOP-1802 hasId() fails for empty collections
TINKERPOP-1803 inject() doesn’t re-attach with remote traversals
TINKERPOP-1819 documentation query and description mismatch
TINKERPOP-1821 Consistent behavior of self-referencing edges
TINKERPOP-1825 Gremlin .NET: Constant() step has incorrect parameter defined
TINKERPOP-1830 Race condition in Tinkergraph index creation
TINKERPOP-1832 TraversalHelper.replaceStep sets previousStep to the wrong step
TINKERPOP-1846 LambdaRestrictionStrategy not triggering for Lambda scripts
TINKERPOP-1848 Fix g:Date assertion in python tests
TINKERPOP-1851 Gremlin long options for -e and -i are not working properly

Improvements

TINKERPOP-1661 Docker-built documentation does not always point locally
TINKERPOP-1725 DotNet GLV: Make traversal generation deterministic
TINKERPOP-1734 DSL for Gremlin .NET
TINKERPOP-1746 Better error message on wrong ordering of emit()/until()/has()
TINKERPOP-1752 Gremlin.Net: Generate completely type-safe methods
TINKERPOP-1756 Provide a way to easily mock a RemoteConnection for tests
TINKERPOP-1759 Improve hashcode and equals for Traverser implementations
TINKERPOP-1768 Bump to Jackson 2.8.10
TINKERPOP-1770 Remote traversal timeout
TINKERPOP-1771 gremlin.bat doesn’t support paths containing spaces
TINKERPOP-1779 Bump to GMavenPlus 1.6
TINKERPOP-1784 Gremlin Language Test Suite
TINKERPOP-1785 Gremlin.Net should be strong-name signed
TINKERPOP-1786 Recipe and missing manifest items for Spark on Yarn
TINKERPOP-1787 Allow :remote command to accept a user defined Cluster instance
TINKERPOP-1806 Consistently use Gremlin.Net instead of Gremlin-DotNet
TINKERPOP-1807 Gremlin-Python doesn’t support GraphSON types g:Date, g:Timestamp and g:UUID
TINKERPOP-1808 Add ability to get the consumer in LambdaSideEffectStep
TINKERPOP-1811 Improve error reporting for serialization errors between gremlin-python and gremlin-server
TINKERPOP-1812 ProfileTest assumes that graph implementations will not add their own steps
TINKERPOP-1813 Subgraph step requires the graph API
TINKERPOP-1814 Some process tests require the graph API
TINKERPOP-1820 Include .NET GLV tests on TravisCI
TINKERPOP-1824 Update netty version to 4.0.52
TINKERPOP-1827 Gremlin .NET: Test Suite Runner
TINKERPOP-1829 Improve flexibility of detachment for EventStrategy
TINKERPOP-1833 DetachedEdge.Builder#setInV and setOutV doesn’t return the builder
TINKERPOP-1835 Bump Netty 4.0.53
TINKERPOP-1837 Gremlin .NET: Provide type coercion between IDictionary<K, V> instances

TinkerPop 3.2.6 (Release Date: August 21, 2017)

This release also includes changes from 3.1.8.

Bumped to Netty 4.0.50
Registered HashMap$TreeNode to Gryo.
Fixed a lambda-leak in SackValueStep where BiFunction must be tested for true lambda status.
Fixed a bug in RangeByIsCountStrategy that broke any ConnectiveStep that included a child traversal with an optimizable pattern.
Allowed access to InjectStep.injections for TraversalStrategy analysis.
Exceptions that occur during result iteration in Gremlin Server will now return SCRIPT_EVALUATION_EXCEPTION rather than SERVER_ERROR.
AddEdgeStep attaches detached vertices prior to edge creation.
Added graph element GraphSON serializers in Gremlin-Python.
Initialization scripts for Gremlin Server will not timeout.
Added Gremlin.Net.
ProfileTest is now less stringent about assertions which will reduce burdens on providers.
GremlinExecutor begins timeout of script evaluation at the time the script was submitted and not from the time it began evaluation.
Added Gremlin.Net.
ReferenceFactory and DetachedFactory now detach elements in collections accordingly.
Deprecated GryoLiteMessageSerializerV1d0 in favor of HaltedTraverserStrategy.
Deprecated the useMapperFromGraph configuration option for Gremlin Server serializers.
JavaTranslator is now smart about handling BulkSet and Tree.
Added annotations to the traversal metrics pretty print.
EdgeOtherVertexStep is no longer final and can be extended by providers.
EdgeVertexStep is no longer final and can be extended by providers.
Deprecated Transaction.submit(Function).
Fixed HADOOP_GREMLIN_LIBS parsing for Windows.
Improved GraphSON serialization performance around VertexProperty.
Changed some tests in EventStrategyProcessTest which were enforcing some unintended semantics around transaction state.
Added WsAndHttpChannelizer and SaslAndHttpBasicAuthenticationHandler to be allow for servicing Http and Websocket requests to the same server
Added deep copy of Bytecode to DefaultTraversal.clone().

Bugs

TINKERPOP-1385 Refactor Profiling test cases
TINKERPOP-1679 Detached side-effects aren’t attached when remoted
TINKERPOP-1683 AbstractHadoopGraphComputer on Windows
TINKERPOP-1691 Some EventStrategyProcessTest assume element state is synced in memory
TINKERPOP-1704 XXXTranslators are not being respective of BulkSet and Tree.
TINKERPOP-1727 Bytecode object shallow copied when traversals are cloned
TINKERPOP-1742 RangeByIsCountStrategy fails for ConnectiveSteps
TINKERPOP-1743 LambdaRestrictionStrategy does not catch lambdas passed to sack()
TINKERPOP-1744 Gremlin .NET: Exception from sync execution gets wrapped in AggregateException

Improvements

TINKERPOP-741 Remove Options For Transaction Retry
TINKERPOP-915 Gremlin Server supports REST and Websockets simultanteously
TINKERPOP-920 Test case needed for ensuring same cardinality for key.
TINKERPOP-1552 C# Gremlin Language Variant
TINKERPOP-1669 EdgeVertexStep should be designed for extension
TINKERPOP-1676 Improve GraphSON 2.0 Performance (breaking)
TINKERPOP-1688 Include TraversalMetrics annotation in pretty print
TINKERPOP-1694 Deprecate useMapperFromGraph
TINKERPOP-1701 HaltedTraverserStrategy should recurse into collections for detachment.
TINKERPOP-1703 Make EdgeOtherVertexStep non-final
TINKERPOP-1708 Add a "Note on Scopes" document
TINKERPOP-1709 Add a list of all the steps that support by()/from()/to()/as()/option()
TINKERPOP-1710 Add a note on tree() by-modulation and uniqueness of tree branches.
TINKERPOP-1714 Gremlin Server scriptEvaluationTimeout should take into account request arrival time
TINKERPOP-1718 Deprecate GryoLiteMessageSerializerV1d0
TINKERPOP-1748 Callout comments break code snippets
TINKERPOP-1749 Bump to Netty 4.0.50

TinkerPop 3.2.5 (Release Date: June 12, 2017)

This release also includes changes from 3.1.7.

Fixed folding of multiple hasId() steps into GraphStep.
Added string performance options to StarGraph.
Fixed a bug in until(predicate) where it was actually calling emit(predicate).
Fixed inconsistency in GraphSON serialization of Path where properties of graph elements were being included when serialized.
Improved performance and memory usage of GraphSON when serializing TinkerGraph and graph elements.
Removed use of stream() in DetachedEdge and DetachedVertex.
Deprecated a constructor in DetachedEdge that made use of Pair in favor of a new one that just uses the objects that were in the Pair.
Improved error messaging on the g.addV(Object…) when passing an invalid arguments.
Reduced memory usage for TinkerGraph deserialization in GraphSON by streaming vertices and edges.
Added the gremlin-archetype-dsl to demonstrate how to structure a Maven project for a DSL.
Developed and documented patterns for Domain Specific Language implementations.
Removed the Groovy dependency from gremlin-python and used Groovy Templates and the gmavenplus-plugin to generate the python GLV classes.
Now using Groovy […] map notation in GroovyTranslator instead of new LinkedHashMap(){{ }}.
Maintained type information on Traversal.promise().
Propagated exception to Future instead of calling thread in RemoteConnection.
Fixed a bug in RepeatUnrollStrategy where LoopsStep and LambdaHolder should invalidate the strategy’s application.
Deprecated authentication.className setting in favor of using authentication.authenticator.
Added authentication.authenticationHandler setting.
Added abstraction to authentication to allow users to plug in their own AbstractAuthenticationHandler implementations.
Fixed a NullPointerException bug in B_LP_O_S_SE_SL_Traverser.
PathRetractionStrategy now uses the marker-model to reduce recursive lookups of invalidating steps.
ProfileStrategy now uses the marker-model to reduce recursive lookups of ProfileSideEffectStep.
Mutating steps now implement Scoping interface.
Fixed a step id compilation bug in AddVertexStartStep, AddVertexStep, AddEdgeStep, and AddPropertyStep.
Added more details to Gremlin Server client side messages - exception hierarchy and stack trace.
Deprecated "Exception-Class" in the Gremlin Server HTTP protocol in favor of the new "exceptions" field.
De-registered metrics on Gremlin Server shutdown.
Added "help" command option on :remote config for plugins that support that feature in the Gremlin Console.
Allowed for multiple scripts and related arguments to be passed to gremlin.sh via -i and -e.
LABELED_PATH requirement is now set if any step in the traversal is labeled.
Updated PathRetractionStrategy to not run if the provided traversal contains a VertexProgramStep that has a LABELED_PATH requirement.
Added various metrics to the GremlinGroovyScriptEngine around script compilation and exposed them in Gremlin Server.
Moved the caffeine dependency down to gremlin-groovy and out of gremlin-server.
Improved script compilation in GremlinGroovyScriptEngine to use better caching, log long compile times and prevent failed compilations from recompiling on future requests.
Synchronized script compilation.
Logged Script compilation times.
Prevented failed scripts from recompiling.
Logged warnings for scripts that take "too long" to compile.
Improved memory usage of the GremlinGroovyScriptEngine.
Added cyclicPath().from().to().by() support to GraphTraversal.
Added simplePath().from().to().by() support to GraphTraversal.
Added path().from().to() support to GraphTraversal so sub-paths can be isolated from the current path.
Added FromToModulating interface for use with to()- and from()-based step modulators.
Added Path.subPath() which supports isolating a sub-path from Path via to/from-labels.
Fixed NullPointerException in GraphMLReader that occurred when an <edge> didn’t have an ID field and the base graph supported ID assignment.
Added ScopingStrategy which will computer and provide all Scoping steps with the path labels of the global Traversal.
Split ComputerVerificationStrategy into two strategies: ComputerVerificationStrategy and ComputerFinalizationStrategy.
Removed HasTest.g_V_hasId_compilationEquality from process test suite as it makes too many assumptions about provider compilation.
Deprecated CustomizerProvider infrastructure.
Deprecated PluginAcceptor infrastructure.
Improved consistency of the application of bindings to GremlinScriptEngine implementations in the BindingsGremlinPlugin.
Fixed a bug in OLAP ComputerAwareStep where end-step labels were not being appended to the traverser correctly.
Refactor SparkContext handler to support external kill and stop operations.
Fixed an optimization bug in LazyBarrierStrategy around appending barriers to the end of a Traversal.
Fixed an optimization bug in PathRetractionStrategy around appending barriers to the end of a Traversal.
TraverserIterator in GremlinServer is smart to try and bulk traversers prior to network I/O.
Improved error handling of compilation failures for very large or highly parameterized script sent to Gremlin Server.
Fixed a bug in RangeByIsCountStrategy that changed the meaning of inner traversals.
Improved Gremlin-Python Driver implementation by adding a threaded client with basic connection pooling and support for pluggable websocket clients.
Changed GraphManager from a final class implementation to an interface.
Updated GraphManager interface to include methods for opening/instantiating a graph and closing a graph.
Implemented DefaultGraphManager to include previous GraphManager functionality and adhere to updated interface.
Deprecated GraphManager.getGraphs() and added GraphManager.getGraphNames().
Deprecated GraphManager.getTraversalSources() and added GraphManager.getTraversalSourceNames().
Fixed a bug so now users can supply a YAML with an empty staticVariableTypes to be used by the FileSandboxExtension

Bugs

TINKERPOP-1258 HasTest.g_V_hasId_compilationEquality makes GraphStep assumptions
TINKERPOP-1528 CountByIsRangeStrategy fails for a particular query
TINKERPOP-1626 choose() is buggy in OLAP
TINKERPOP-1638 count() is optimized away in where()
TINKERPOP-1640 ComputerVerificationStrategy gives false errors
TINKERPOP-1652 Disable PathRetractionStrategy strategy if VertexProgramStep has LABELLED_PATH requirement
TINKERPOP-1660 Documentation links should not link to TINKERPOP-xxxx branches
TINKERPOP-1666 NPE in FileSandboxExtension if staticVariableTypes is empty in supplied YAML file
TINKERPOP-1668 RepeatUnrollStrategy should not execute if there is a LoopStep used.
TINKERPOP-1670 End type lost when using promise()
TINKERPOP-1673 GroovyTranslator produces Gremlin that can’t execute on :remote
TINKERPOP-1675 RemoteStep#processNextStart() throws CompletionException instead of underlying exception
TINKERPOP-1681 Multiple hasId’s are or’d into GraphStep

Improvements

TINKERPOP-761 Some basic mathematical functions / steps
TINKERPOP-786 Patterns for DSL Development
TINKERPOP-1044 ResponseMessage should contain server-side exception name.
TINKERPOP-1095 Create a custom ScriptContext
TINKERPOP-1266 Make memory available to benchmarks configurable
TINKERPOP-1303 add help for :remote config for Gephi Plugin
TINKERPOP-1340 docs do not state at what version an API was introduced (or deprecated)
TINKERPOP-1387 from and to modulators for path steps
TINKERPOP-1438 Consider GraphManager as an interface*(breaking)*
TINKERPOP-1453 Allow Gremlin-Python to handle asynchronous failure
TINKERPOP-1577 Provide support for Python3 or Python2 in the Docker builds.
TINKERPOP-1599 implement real gremlin-python driver
TINKERPOP-1614 Improve documentation for Graph.V() and Graph.E() on main docs page
TINKERPOP-1618 Remove groovy dependency from gremlin-python
TINKERPOP-1627 LazyBarrierStrategy should not append an end barrier.
TINKERPOP-1631 Fix visibility issues with the BindingsGremlinPlugin
TINKERPOP-1634 Deprecate old methods of GremlinGroovyScriptEngine customization
TINKERPOP-1642 Improve performance of mutating traversals
TINKERPOP-1644 Improve script compilation process and include metrics
TINKERPOP-1653 Allow multiple scripts with arguments to be passed to the Console
TINKERPOP-1657 Provide abstraction to easily allow different HttpAuth schemes
TINKERPOP-1663 Validate a maximum for the number of parameters passed to Gremlin Server
TINKERPOP-1665 Remove unittest from Gremlin-Python tests
TINKERPOP-1671 Default method for RemoteConnection.submitAsync throws exception from submit on calling thread instead of failing the future
TINKERPOP-1677 Bump Groovy to 2.4.11
TINKERPOP-1680 Add string performance options to StarGraph

TinkerPop 3.2.4 (Release Date: February 8, 2017)

This release also includes changes from 3.1.6.

Fixed a bug where PathProcessor.keepLabels were not being pushed down into child traversals by PathRetractionStrategy.
Added default MessagePassingReductionStrategy for GraphComputer that can reduce the number of message passing iterations.
Fixed a bug associated with user-provided maps and GroupSideEffectStep.
GroupBiOperator no longer maintains a detached traversal and thus, no more side-effect related OLAP inconsistencies.
Added ProjectedTraverser which wraps a traverser with a List<Object> of projected data.
Fixed an optimization bug in CollectingBarrierSteps where the barrier was being consumed on each addBarrier().
OrderGlobalStep and SampleGlobalStep use ProjectedTraverser and now can work up to the local star graph in OLAP.
SASL negotiation supports both a byte array and Base64 encoded bytes as a string for authentication to Gremlin Server.
Deprecated all test suites in gremlin-groovy-test - Graph Providers no longer need to implement these.
Deprecated TinkerIoRegistry replacing it with the more consistently named TinkerIoRegistryV1d0.
Made error messaging more consistent during result iteration timeouts in Gremlin Server.
Fixed a memory leak in the classloader for the GremlinGroovyScriptEngine where classes in the loader were not releasing from memory as a strong reference was always maintained.
PathRetractionStrategy does not add a NoOpBarrierStep to the end of local children as its wasted computation in 99% of traversals.
Fixed a bug in AddVertexStartStep where if a side-effect was being used in the parametrization, an NPE occurred.
Fixed a bug in LazyBarrierStrategy where profile() was deactivating it accidentally.
Fixed a bug in RepeatUnrollStrategy where stateful DedupGlobalStep was cloned and thus, maintained two deduplication sets.
Added documentation around "terminal steps" in Gremlin: hasNext(), next(), toList(), etc.
Added specific GraphSON serializers for RequestMessage and ResponseMessage in GraphSON 2.0.
Added CloseableIterator to allow Graph providers who open expensive resources a way to let users release them.
Fixed minor bug in gremlin-driver where closing a session-based Client without initializing it could generate an error.
Relieved synchronization pressure in various areas of TinkerGraphComputer.
Fixed an optimization bug in OLAP-based DedupGlobalStep where deduping occurred twice.
MemoryComputeKey now implements Cloneable which is useful for BiOperator reducers that maintain thread-unsafe state.
TinkerGraphComputer now supports distributed Memory with lock-free partition aggregation.
TinkerGraph Gryo and GraphSON deserialization is now configured to use multi-properties.
Changed behavior of ElementHelper.areEqual(Property, Property) to not throw exceptions with null arguments.
Added GryoVersion for future flexibility when introducing a new verison of Gryo and moved serializer registrations to it.
Fixed Gryo serialization of ConnectiveP instances.
Lessened the severity of Gremlin Server logging when it encounters two or more serializers addressing the same mime type.
Bumped to Netty 4.0.42.final.
Added ByteBuffer, InetAddress, Timestamp to the list of Gryo supported classes.
Fixed Gryo serialization of Class.
Fixed GraphSON serialization of enums like T, P, etc. where values were overriding each other in the GraphSON type registry.
Fixed a bug in Gremlin-Python around .() and __.start().
Fixed a bug around long serialization in Gremlin-Python when using Python3.
Deprecated TraversalSource.withBindings() as it is no longer needed in Gremlin-Java and never was needed for other variants.
Fixed a bug in Gremlin-Java Bytecode where anonymous traversals were not aware of parent bindings.
Fixed a bug in Gremlin-Java GraphSON deserialization around P.within() and P.without().
Converted Spark process suite tests to "integration" tests.
Fixed a bug in InlineFilterStrategy having to do with folding HasContainers into VertexStep.
Deprecated HasContainer.makeHasContainers() which was used to dissect AndP and shouldn’t be used at the TinkerPop-level.
GraphTraversal.has() now will try and fold-left HasContainer if end step is a HasContainerHolder.
Created explicit P-predicate methods for GraphTraversal.hasXXX().
Fixed a bug in FilterRankStrategy around where().by() ordering.
Added another optimization in RangeByIsCountStrategy, that removes count().is() altogether if it’s not needed.
Fixed a OLAP MatchStep.clone()-bug that occurs when the match() is in a local child.
Added another optimization in RangeByIsCountStrategy, that removes count().is() altogether if it’s not needed.
Fixed a bug in RangeByIsCountStrategy where labeled parents shouldn’t have the strategy applied to their children.
Fixed a bug in PathRetractionStrategy where MatchEndStep labels were being dropped when they shouldn’t be.
Added TinkerGraphCountStrategy which translates g.V().map*.count() patterns into direct Map.size() calls in TinkerGraph.
Added Path.head() and Path.isEmpty() with default method implementations.
Fixed a NoSuchElementException bug with GroupXXXStep where if the reduced TraverserSet is empty, don’t add the key/value.
Fixed a NullPointerException bug with profiling GroupSideEffectStep in OLTP.
Improved ability to release resources in GraphProvider instances in the test suite.
Factored GremlinPlugin functionality out of gremlin-groovy and into gremlin-core - related classes were deprecated.
Added a force option for killing sessions without waiting for transaction close or timeout of a currently running job or multiple jobs.
Deprecated Session.kill() and Session.manualKill().
Added Traversal.promise() method to allow for asynchronous traversal processing on "remote" traversals.
Deprecated RemoteConnection.submit(Bytecode) in favor of submitAsync(Bytecode).
Added choose(predicate,traversal) and choose(traversal,traversal) to effect if/then-semantics (no else). Equivalent to choose(x,y,identity()).
Removed ImmutablePath.TailPath as it is no longer required with new recursion model.
Removed call stack recursion in ImmutablePath.
Gremlin-Python serializes Bytecode as an object (instead of a JSON string) when submit over the RemoteConnection.
Fixed the handling of the DriverRemoteConnection pass-through configurations to the driver.
IncidentToAdjacentStrategy now uses a hidden label marker model to avoid repeated recursion for invalidating steps.
PathProcessorStrategy can inline certain where(traversal)-steps in order to increase the likelihood of star-local children.
SparkGraphComputer no longer starts a worker iteration if the worker’s partition is empty.
Added ProjectStep.getProjectKeys() for strategies that rely on such information.
Added VertexFeatures.supportsDuplicateMultiProperties() for graphs that only support unique values in multi-properties.
Deprecated the "performance" tests in OptIn.
Deprecated getInstance() methods in favor of instance() for better consistency with the rest of the API.
Block calls to "remote" traversal side-effects until the traversal read is complete which signifies an end to iteration.
Added Pick.none and Pick.any to the serializers and importers.
Added a class loader to TraversalStrategies.GlobalCache which guarantees strategies are registered prior to GlobalCache.getStrategies().
Fixed a severe bug where GraphComputer strategies are not being loaded until the second use of the traversal source.
The root traversal now throws regular NoSuchElementException instead of FastNoSuchElementException. (breaking)
Added a short sleep to prevent traversal from finishing before it can be interrupted during TraversalInterruptionComputerTest.
Added support for SSL client authentication

Bugs

TINKERPOP-1380 dedup() doesn’t dedup in rare cases
TINKERPOP-1384 Description of filter function in traversal documentation
TINKERPOP-1428 profile() throws NPE for union(group, group)
TINKERPOP-1521 Mutating steps don’t recognize side-effects
TINKERPOP-1525 Plug VertexProgram iteration leak on empty Spark RDD partitions
TINKERPOP-1534 Gremlin Server instances leaking in tests
TINKERPOP-1537 Python tests should not use hard-coded number of workers
TINKERPOP-1547 Two bugs found associated with MatchStep: Path retraction and range count.
TINKERPOP-1548 Traversals can complete before interrupted in TraversalInterruptionComputerTest
TINKERPOP-1560 Cache in GroovyClassLoader may continue to grow
TINKERPOP-1561 gremiln-python GraphSONWriter doesn’t properly serialize long in Python 3.5
TINKERPOP-1567 GraphSON deserialization fails with within('a')
TINKERPOP-1573 Bindings don’t work in coalesce
TINKERPOP-1576 gremlin-python calls non-existent methods
TINKERPOP-1581 Gremlin-Python driver connection is not thread safe.
TINKERPOP-1583 PathRetractionStrategy retracts keys that are actually needed
TINKERPOP-1585 OLAP dedup over non elements
TINKERPOP-1587 Gremlin Server Subgraph Cardinality Not Respected
TINKERPOP-1594 LazyBarrierStrategy does not activate with ProfileStep
TINKERPOP-1605 gremlin-console 3.2.3 -e can no longer take paths relative to current working directory

Improvements

TINKERPOP-887 FastNoSuchElementException hides stack trace in client code
TINKERPOP-919 Features needs to specify whether 2 vertex properties with same key/value is allowed.
TINKERPOP-932 Add ability to cancel script execution associated with a Gremlin Server Session
TINKERPOP-1248 OrderGlobalStep should use local star graph to compute sorts, prior to reduction.
TINKERPOP-1261 Side-effect group().by() can’t handle user-defined maps
TINKERPOP-1292 TinkerGraphComputer VertexProgramInterceptors
TINKERPOP-1372 ImmutablePath should not use Java recursion (call stacks are wack)
TINKERPOP-1433 Add steps to dev docs to help committers get their keys in order
TINKERPOP-1434 Block calls to traversal side-effects until read is complete
TINKERPOP-1471 IncidentToAdjacentStrategy use hidden marker to avoid repeated recursion.
TINKERPOP-1473 Given PathRetractionStrategy, PathProcessorStrategy can be extended to support partial where() inlining.
TINKERPOP-1482 has(x).has(y) chains should be has(x.and(y))
TINKERPOP-1490 Provider a Future based Traversal.async(Function<Traversal,V>) terminal step
TINKERPOP-1502 Chained has()-steps should simply left-append HasContainers in Gremlin-Java.
TINKERPOP-1507 Pick.any and Pick.none are not in GraphSON or Gremlin-Python
TINKERPOP-1508 Add choose(predicate,trueTraversal)
TINKERPOP-1527 Do not override registered strategies in TraversalStrategies.GlobalCache
TINKERPOP-1530 Consistent use of instance()
TINKERPOP-1539 Create a ComplexTraversalTest with crazy nested gnarly traversals.
TINKERPOP-1542 Add Path.isEmpty() with a default implementation.
TINKERPOP-1562 Migrate ScriptEngine-related code to gremlin-core
TINKERPOP-1570 Bump to Netty 4.0.42
TINKERPOP-1582 TraversalOpProcessor does not support custom serializers
TINKERPOP-1584 Add gryo serializers to support types covered in GraphSON
TINKERPOP-1588 Added Terminal Steps section to the docs
TINKERPOP-1589 Re-Introduce CloseableIterator
TINKERPOP-1590 Create TinkerWorkerMemory and Partitioned Vertices
TINKERPOP-1600 Consistent use of base 64 encoded bytes for SASL negotiation
TINKERPOP-1602 Support SSL client certificate authentication
TINKERPOP-1606 Refactor GroupStep to not have the reduction traversal included in its BiOperator.
TINKERPOP-1610 Deprecate gremlin-groovy-test provider based tests
TINKERPOP-1617 Create a SingleIterationStrategy which will do its best to rewrite OLAP traversals to not message pass.

TinkerPop 3.2.3 (Release Date: October 17, 2016)

This release also includes changes from 3.1.5.

Restructured Gremlin-Python’s GraphSON I/O package to make it easier for users to register serializers/deserializers. (breaking)
Fixed a bug with TraversalOpProcessor that was returning a final result prior to committing the transaction.
Fixed a bug in ConnectiveStrategy where infix and/or was not correctly reasoning on choose() HasNextStep injections.
Increased performance of CredentialGraph authentication.
Removed Java 8 stream usage from TraversalHelper for performance reasons.
Fixed a bug in RepeatStep where emit().as('x') wasn’t adding the step labels to the emit-traverser.
Added GraphComputing.atMaster(boolean) to allow steps to know whether they are executing at master or distributed at workers.
Fixed a bug in OLAP where DedupGlobalStep wasn’t de-duping local master traversers.
Added HasContainerHolder.removeHasContainer()-method with default UnsupportedOperationException implementation.
TraversalSource.withComputer() is simplified to add a VertexProgramStrategy. Easier for language variants.
Fixed a Set, List, Map bug in the various Translators where such collections were not being internally translated.
Fixed a Bytecode bug where nested structures (map, list, set) were not being analyzed for bindings and bytecode conversions.
Fixed a String bug in GroovyTranslator and PythonTranslator where if the string has double-quotes it now uses """ """.
Added a default TraversalStrategy.getConfiguration() which returns the configuration needed to construct the strategy.
Computer instances can be created with Computer.create(Configuration) and accessed via Computer.getConf().
Every TraversalStrategy can be created via a Configuration and a static MyStrategy.create(Configuration).
Added language-agnostic TraversalStrategy support in Bytecode.
Added PartitionStrategy.Builder.readPartitions() and deprecated PartitionStrategy.Builder.addPartition().
A new version of LazyBarrierStrategy has been created and added to the default strategies.
FilterRankStrategy now propagates labels "right" over non-Scoping filters.
Fixed a bug in ConnectiveP where nested equivalent connectives should be inlined.
Fixed a bug in IncidentToAdjacentStrategy where TreeStep traversals were allowed.
Fixed a end-step label bug in MatchPredicateStrategy.
Fixed a bug in MatchPredicateStrategy where inlined traversals did not have strategies applied to it.
Fixed a bug in RepeatUnrollStrategy where inlined traversal did not have strategies applied to it.
Fixed padding of prompt in Gremlin Console when the number of lines went beyond a single digit.
Fixed GraphSON 2.0 namespace for TinkerGraph to be "tinker" instead of "gremlin".
Dropped serialization support in GraphSON 2.0 for Calendar, TimeZone, and Timestamp.
Added TraversalHelper.copyLabels() for copying (or moving) labels form one step to another.
Added TraversalHelper.applySingleLevelStrategies() which will apply a subset of strategies but not walk the child tree.
Added the concept that hidden labels using during traversal compilation are removed at the end during StandardVerificationStrategy. (breaking)
Added InlineFilterStrategy which will determine if various TraversalParent children are filters and if so, inline them.
Removed IdentityRemovalStrategy from the default listing as its not worth the clock cycles.
Removed the "!" symbol in NotStep.toString() as it is confusing and the NotStep-name is sufficient.
Fixed a bug in TraversalVertexProgram (OLAP) around ordering and connectives (i.e. and() and or()).
Added AbstractGremlinProcessTest.checkOrderedResults() to make testing ordered results easier.
AbstractLambdaTraversal now supports a bypassTraversal where it is possible for strategies to redefine such lambda traversals.
Added an internal utility ClassFilterStep which determines if the traverser object’s class is an instance of the provided class.
ConnectiveStep extends FilterStep and thus, is more appropriately categorized in the step hierarchy.
PropertyMapStep supports a provided traversal for accessing the properties of the element. (breaking)
SubgraphStrategy now supports vertex property filtering.
Fixed a bug in Gremlin-Python P where predicates reversed the order of the predicates.
Added tests to DedupTest for the dedup(Scope, String…) overload.
Added more detailed reference documentation for IO formats.
Fixed a bug in serialization of Lambda instances in GraphSON, which prevented their use in remote traversals.
Fixed a naming bug in Gremlin-Python where P.and and P._or should be P.and and P.or_. (breaking)
where() predicate-based steps now support by()-modulation.
Added Gryo serialization for Bytecode.
Moved utility-based serializers to UtilSerializers for Gryo - these classes were private and hence this change is non-breaking.
TraversalRing returns a null if it does not contain traversals (previously IdentityTraversal).
Deprecated Graph.Exceptions.elementNotFoundException() as it was not used in the code base outside of the test suite.
Fixed a JavaTranslator bug where Bytecode instructions were being mutated during translation.
Added Path to Gremlin-Python with respective GraphSON 2.0 deserializer.
Traversal and TraversalSource now implement AutoCloseable.
Added "keep-alive" functionality to the Java driver, which will send a heartbeat to the server when normal request activity on a connection stops for a period of time.
Renamed the empty.result.indicator preference to result.indicator.null in Gremlin Console
If result.indicator.null is set to an empty string, then no "result line" is printed in Gremlin Console.
Deprecated reconnectInitialDelay on the Java driver.
Added some validations to Cluster instance building.
Produced better errors in readGraph of GryoReader and GraphSONReader if a Vertex cannot be found in the cache on edge loading.
VertexPrograms can now declare traverser requirements, e.g. to have access to the path when used with .program().
New build options for gremlin-python where -DglvPython is no longer required.
Added missing InetAddress to GraphSON extension module.
Added new recipe for "Pagination".
Added new recipe for "Recommendation".
Added functionality to Gremlin-Server REST endpoint to forward Exception Messages and Class in HTTP Response
Gremlin Server TraversalOpProcessor now returns confirmation upon Op close.
Added close method Java driver and Python driver DriverRemoteTraversalSideEffects.

Bugs

TINKERPOP-1423 IncidentToAdjacentStrategy should be disabled for tree steps
TINKERPOP-1440 g:Path needs a GraphSON deserializer in Gremlin-Python
TINKERPOP-1457 Groovy Lambdas for remote traversals not serializable
TINKERPOP-1458 Gremlin Server doesn’t return confirmation upon Traversal OpProcessor "close" op
TINKERPOP-1466 PeerPressureTest has been failing recently
TINKERPOP-1472 RepeatUnrollStrategy does not semi-compile inlined repeat traversal
TINKERPOP-1476 TinkerGraph does not get typed with the right type name in GraphSON
TINKERPOP-1495 Global list deduplication doesn’t work in OLAP
TINKERPOP-1500 and/or infix and choose() do not work correctly.
TINKERPOP-1511 Remote client addV, V()

Improvements

TINKERPOP-790 Implement AutoCloseable on TraversalSource
TINKERPOP-944 Deprecate Graph.Exceptions.elementNotFound
TINKERPOP-1189 SimpleAuthenticator over HttpChannelizer makes Gremlin Server pretty slow and consumes more CPU
TINKERPOP-1249 Gremlin driver to periodically issue ping / heartbeat to gremlin server
TINKERPOP-1280 VertexPrograms should declare traverser requirements
TINKERPOP-1330 by()-modulation for where()
TINKERPOP-1409 Make the "null" return in the gremlin console into something more understandable (breaking)
TINKERPOP-1431 Documentation generation requires tests to execute on gremlin-python
TINKERPOP-1437 Add tests for dedup(Scope) in DedupTest
TINKERPOP-1444 Benchmark bytecode→Traversal creation and implement GremlinServer cache if necessary.
TINKERPOP-1448 gremlin-python should be Python 2/3 compatible
TINKERPOP-1449 Streamline gremlin-python build
TINKERPOP-1455 Provide String-based withStrategy()/withoutStrategy() for language variant usage
TINKERPOP-1456 Support SubgraphStrategy.vertexProperties().
TINKERPOP-1460 Deprecate reconnectInitialDelay in Java driver
TINKERPOP-1464 Gryo Serialization for Bytecode
TINKERPOP-1469 Get rid of Stream-usage in TraversalHelper
TINKERPOP-1470 InlineFilterStrategy should try and P.or() has() children in OrSteps.
TINKERPOP-1486 Improve API of RemoteConnection
TINKERPOP-1487 Reference Documentation for IO
TINKERPOP-1488 Make LazyBarrierStrategy part of the default TraversalStrategies (breaking)
TINKERPOP-1492 RemoteStrategy or the RemoteConnection should append a lazy barrier().
TINKERPOP-1423 IncidentToAdjacentStrategy should be disabled for tree steps
TINKERPOP-1440 g:Path needs a GraphSON deserializer in Gremlin-Python
TINKERPOP-1457 Groovy Lambdas for remote traversals not serializable
TINKERPOP-1458 Gremlin Server doesn’t return confirmation upon Traversal OpProcessor "close" op
TINKERPOP-1466 PeerPressureTest has been failing recently
TINKERPOP-1472 RepeatUnrollStrategy does not semi-compile inlined repeat traversal
TINKERPOP-1495 Global list deduplication doesn’t work in OLAP
TINKERPOP-1500 and/or infix and choose() do not work correctly.
TINKERPOP-1511 Remote client addV, V()

TinkerPop 3.2.2 (Release Date: September 6, 2016)

This release also includes changes from 3.1.4.

Included GraphSON as a default serializer (in addition to Gryo, which was already present) in Gremlin Server if none are defined.
Added gremlin-python package as a Gremlin language variant in Python.
Added Bytecode which specifies the instructions and arguments used to construct a traversal.
Created an experimental GraphSON representation of Bytecode that will be considered unstable until 3.3.0.
Added Translator which allows from the translation of Bytecode into some other form (e.g. script, Traversal, etc.).
Added JavaTranslator, GroovyTranslator, PythonTranslator, and JythonTranslator for translating Bytecode accordingly.
Added TranslationStrategy to gremlin-test so translators can be tested against the process test suite.
Added Traversal.Admin.nextTraverser() to get the next result in bulk-form (w/ default implementation).
Added TraversalSource.getAnonymousTraversalClass() (w/ default implementation).
Added GremlinScriptEngine interface which specifies a eval(Bytecode, Bindings) method.
Deprecated RemoteGraph in favor of TraversalSource.withRemote() as it is more technically correct to tie a remote traversal to the TraversalSource than a Graph instance.
GremlinGroovyScriptEngine implements GremlinScriptEngine.
Added GremlinJythonScriptEngine which implements GremlinScriptEngine.
Removed support for submitting a Java serialized Traversal to Gremlin Server.
Removed a largely internal feature that supported automatic unrolling of traversers in the Gremlin Driver.
Made it possible to directly initialize OpProcessor implementations with server Settings.
Included GraphSON as a default serializer (in addition to Gryo, which was already present) in Gremlin Server if none are defined
Introduced GraphSON 2.0.
Deprecated embedTypes on the builder for GraphSONMapper.
Bumped to Netty 4.0.40.final.
Defaulted the gremlinPool setting in Gremlin Server to be zero, which will instructs it to use Runtime.availableProcessors() for that settings.
Changed scope of log4j dependencies so that they would only be used in tests and the binary distributions of Gremlin Console and Server.
Deprecated Io.Builder.registry() in favor of the newly introduced Io.Builder.onMapper().
Added new recipe for "Traversal Induced Values".
Fixed a potential leak of a ReferenceCounted resource in Gremlin Server.
Added class registrations for Map.Entry implementations to GryoMapper.
Added methods to retrieve Cluster settings in gremlin-driver.
Fixed a severe bug in SubgraphStrategy.
Deprecated SubgraphStrategy.Builder.vertexCriterion()/edgeCriterion() in favor of vertices()/edges().
Fixed a small bug in StandardVerificationStrategy that caused verification to fail when withPath was used in conjunction with ProfileStep.
Added color preferences
Added input, result prompt preferences
Added multi-line indicator in Gremlin Console

Bugs

TINKERPOP-810 store not visible
TINKERPOP-1151 slf4j-log4j12 / log4j is only required for testing (breaking)
TINKERPOP-1383 publish-docs.sh might publish to current too early
TINKERPOP-1390 IdentityRemoveStrategyTest fails randomly
TINKERPOP-1400 SubgraphStrategy introduces infinite recursion if filter has Vertex/Edge steps.
TINKERPOP-1405 profile() doesn’t like withPath()

Improvements

TINKERPOP-1037 Gremlin shell output coloring
TINKERPOP-1226 Gremlin Console should :clear automagically after "Display stack trace."
TINKERPOP-1230 Serialising lambdas for RemoteGraph
TINKERPOP-1274 GraphSON Version 2.0
TINKERPOP-1278 Implement Gremlin-Python and general purpose language variant test infrastructure
TINKERPOP-1285 Gremline console does not differentiate between multi-line and single-line input
TINKERPOP-1334 Provide a way to pull gremlin.driver.Cluster connection settings.
TINKERPOP-1347 RemoteConnection needs to provide TraversalSideEffects. (breaking)
TINKERPOP-1373 Default gremlinPool to number of cores
TINKERPOP-1386 Bump to Netty 4.0.40.Final
TINKERPOP-1392 Remove support for java serialized Traversal (breaking)
TINKERPOP-1394 Fix links in Recipes doc
TINKERPOP-1396 Traversal Induced Values Recipe
TINKERPOP-1402 Impossible for graph implementations to provide a class resolver for Gryo IO
TINKERPOP-1407 Default serializers for Gremlin Server
TINKERPOP-1425 Use trailing underscores in gremlin-python

TinkerPop 3.2.1 (Release Date: July 18, 2016)

This release also includes changes from 3.1.3.

PathProcessor steps now have the ability (if configured through a strategy) to drop Traverser path segments.
MatchStep in OLTP has a lazy barrier to increase the probability of bulking.
Added PathRetractionStrategy which will remove labeled path segments that will no longer be referenced.
Added Path.retract() to support retracting paths based on labels.
Optimized ImmutablePath and MutablePath equality code removing significant unnecessary object creation code.
Bumped to Groovy 2.4.7.
Added RepeatUnrollStrategy to linearize a repeat()-traversal if loop amount is known at compile time.
Fixed a bug in BranchStep around child integration during clone().
Fixed a bug in AbstractStep around label set cloning.
Added TraversalStrategyPerformanceTest for verifying the performance gains of optimization-based traversal strategies.
TraversalExplanation.prettyPrint() exists which provides word wrapping and GremlinConsole is smart to use console width to control toString().
TraversalOpProcessor (RemoteConnection) uses HaltedTraverserStrategy metadata to determine detachment procedure prior to returning results.
Allow DFS paths in HADOOP_GREMLIN_LIBS.
Added a safer serializer infrastructure for use with SparkGraphComputer that uses KryoSerializer and the new GryoRegistrator.
Added HaltedTraverserStrategy to allow users to get back different element detachments in OLAP.
Fixed a NullPointerException bug around nested group()-steps in OLAP.
Fixed a severe bug around halted traversers in a multi-job OLAP traversal chain.
Ensure a separation of GraphComputer and VertexProgram configurations in SparkGraphComputer and GiraphGraphComputer.
PeerPressureVertexProgram now supports dynamic initial vote strength calculations.
Added EmptyMemory for ease of use when no memory exists.
Updated VertexComputing.generateProgram() API to include Memory. (breaking)
ImmutablePath.TailPath is now serializable like ImmutablePath.
Added ConfigurationCompilerProvider which allows fine-grained control of some of the internal GremlinGroovyScriptEngine settings at the Groovy compilation level.
Introduced the application/vnd.gremlin-v1.0+gryo-lite serialization type to Gremlin Server which users "reference" elements rather than "detached".
GryoMapper allows overrides of existing serializers on calls to addCustom on the builder.
Added a traversal style guide to the recipes cookbook.
Fixed a bug in master-traversal traverser propagation.
Added useful methods for custom VertexPrograms to be used with program()-step.
Increased the test coverage around traverser propagation within a multi-job OLAP traversal.
Added tests to validate the status of a transaction immediately following calls to close.
Added tests to ensure that threaded transactions cannot be re-used.
GraphFilter helper methods are now more intelligent when determining edge direction/label legality.
Added GraphFilterStrategy to automatically construct GraphFilters via traversal introspection in OLAP.
Updated the Gephi Plugin to support Gephi 0.9.x.
Increased the testing and scope of TraversalHelper.isLocalStarGraph().
Changed signature of get_g_VXlistXv1_v2_v3XX_name and get_g_VXlistX1_2_3XX_name of VertexTest to take arguments for the Traversal to be constructed by extending classes.
Added VertexProgramInterceptor interface as a general pattern for GraphComputer providers to use for bypassing GraphComputer semantics where appropriate.
Added SparkStarBarrierInterceptor that uses Spark DSL for local star graph traversals that end with a ReducingBarrierStep.
Added SparkInterceptorStrategy which identifies which interceptor to use (if any) given the submitted VertexProgram.
Added SparkSingleIterationStrategy that does not partition nor cache the graph RDD if the traversal does not message pass.
Added more helper methods to TraversalHelper for handling scoped traversal children.
Deprecated all "performance" tests based on "JUnit Benchmarks".
SparkGraphComputer no longer shuffles empty views or empty outgoing messages in order to save time and space.
TraversalVertexProgram no longer maintains empty halted traverser properties in order to save space.
Added List<P<V>> constructors to ConnectiveP, AndP, and OrP for ease of use.
Added support for interactive (-i) and execute (-e) modes for Gremlin Console.
Displayed line numbers for script execution failures of -e and -i.
Improved messaging around script execution errors in Gremlin Console.
Added "help" support to Gremlin Console with the -h flag.
Added options to better control verbosity of Gremlin Console output with -Q, -V and -D.
Deprecated the ScriptExecutor - the -e option to gremlin.sh is now handled by Console.
Traversal now allows cancellation with Thread.interrupt().
Added a Gremlin language variant tutorial teaching people how to embed Gremlin in a host programming language.

Bugs

TINKERPOP-1281 Memory.HALTED_TRAVERSER transience is not sound.
TINKERPOP-1305 HALTED_TRAVERSERS hold wrong information
TINKERPOP-1307 NPE with OLTP nested group() in an OLAP group() traversal
TINKERPOP-1323 ComputerVerificationStrategy fails for nested match() steps
TINKERPOP-1341 UnshadedKryoAdapter fails to deserialize StarGraph when SparkConf sets spark.rdd.compress=true whereas GryoSerializer works
TINKERPOP-1348 TraversalInterruptionTest success dependent on iteration order

Improvements

TINKERPOP-818 Consider a P.type()
TINKERPOP-946 Traversal respecting Thread.interrupt()
TINKERPOP-947 Enforce semantics of threaded transactions as manual (breaking)
TINKERPOP-1059 Add test to ensure transaction opening happens at read/write and not on close (breaking)
TINKERPOP-1071 Enhance pre-processor output
TINKERPOP-1091 Get KryoSerializer to work natively. (breaking)
TINKERPOP-1120 If there is no view nor messages, don’t create empty views/messages in SparkExecutor
TINKERPOP-1144 Improve ScriptElementFactory
TINKERPOP-1155 gremlin.sh -e doesn’t log line numbers for errors
TINKERPOP-1156 gremlin.sh could use a help text
TINKERPOP-1157 gremlin.sh should allow you to execute a script and go interactive on error or completion
TINKERPOP-1232 Write a tutorial demonstrating the 3 ways to write a Gremlin language variant.
TINKERPOP-1254 Support dropping traverser path information when it is no longer needed.
TINKERPOP-1268 Improve script execution options for console (breaking)
TINKERPOP-1273 Deprecate old performance tests
TINKERPOP-1276 Deprecate serializedResponseTimeout
TINKERPOP-1279 Add Iterable<V> parameter constructor to ConnectiveP subclasses
TINKERPOP-1282 Add more compliance tests around how memory and vertex compute keys are propagated in chained OLAP.
TINKERPOP-1286 Add Recipes documentation
TINKERPOP-1288 Support gremlin.spark.skipPartitioning configuration.
TINKERPOP-1290 Create VertexProgramInterceptor as a pattern for GraphComputer strategies.
TINKERPOP-1293 Implement GraphFilterStrategy as a default registration for GraphComputer
TINKERPOP-1294 Deprecate use of junit-benchmarks
TINKERPOP-1297 Gephi plugin on Gephi 0.9.x (breaking)
TINKERPOP-1299 Refactor TraversalVertexProgram to make it easier to understand.
TINKERPOP-1308 Serialize to "reference" for Gremlin Server
TINKERPOP-1310 Allow OLAP to return properties as Detached
TINKERPOP-1321 Loosen coupling between TinkerPop serialization logic and shaded Kryo
TINKERPOP-1322 Provide fine-grained control of CompilerConfiguration
TINKERPOP-1328 Provide [gremlin-python] as an code executor in docs
TINKERPOP-1331 HADOOP_GREMLIN_LIBS can only point to local file system
TINKERPOP-1332 Improve .explain() Dialogue
TINKERPOP-1338 Bump to Groovy 2.4.7
TINKERPOP-1349 RepeatUnrollStrategy should unroll loops while maintaining equivalent semantics.
TINKERPOP-1355 Design HasContainer for extension

TinkerPop 3.2.0 (Release Date: April 8, 2016)

This release also includes changes from 3.1.2-incubating.

Bumped to Neo4j 2.3.3.
Renamed variable local to fs in HadoopGremlinPlugin to avoid a naming conflict with Scope.local. (breaking)
Added GraphTraversal.optional() which will use the inner traversal if it returns results, else it won’t.
GroupStep and GroupSideEffectStep make use of mid-traversal reducers to limit memory consumption in OLAP.
Added GraphTraversal.program(VertexProgram) to allow arbitrary user vertex programs in OLAP.
Added GraphTraversal.project() for creating a Map<String,E> given the current traverser and an arbitrary number of by()-modulators.
HADOOP_GREMLIN_LIBS can now reference a directory in HDFS and will be used if the directory does not exist locally.
Added gremlin-benchmark module with JMH benchmarking base classes that can be used for further benchmark development.
TraversalStrategies.GlobalCache supports both Graph and GraphComputer strategy registrations.
select("a","b").by("name").by("age")-style traversals now work in OLAP with new PathProcessorStrategy.
DedupGlobalStep can now handle star-bound by()-modulators and scoped keys on GraphComputer.
Added Computer which is a builder for GraphComputers that is serializable.
PersistedOutputRDD now implements PersistResultGraphAware and thus, no more unneeded warnings when using it.
Renamed StandardTraversalMetrics to DefaultTraversalMetrics given the DefaultXXX-convention throughout. (breaking)
Bumped to Apache Hadoop 2.7.2.
Fixed a bug around profiling and nested traversals.
Added gremlin.hadoop.defaultGraphComputer so users can use graph.compute() with HadoopGraph.
Added gremlin.hadoop.graphReader and gremlin.hadoop.graphWriter which can handled XXXFormats and XXXRDDs.
Deprecated gremlin.hadoop.graphInputFormat, gremlin.hadoop.graphOutputFormat, gremlin.spark.graphInputRDD, and gremlin.spark.graphOutputRDD.
If no configuration is provided to HadoopPools it uses the default configuration to create a pool once and only once per JVM.
Implemented RemoteGraph, RemoteConnection, and RemoteStrategy.
Added validation to GryoMapper Kryo identifiers before construction to prevent accidental duplicates.
Added GraphStep.addIds() which is useful for HasContainer "fold ins."
Added a static GraphStep.processHashContainerIds() helper for handling id-based HasContainers.
GraphStep implementations should have g.V().hasId(x) and g.V(x) compile equivalently. (breaking)
Optimized ExpandableStepIterator with simpler logic and increased the likelihood of bulking.
Optimized TraverserRequirement calculations.
Step.addStart() and Step.addStarts() now take Traverser.Admin<S> and Traverser.Admin<S>, respectively. (breaking)
Step.processNextStart() and Step.next() now return Traverser.Admin<E>. (breaking)
Traversal.addTraverserRequirement() method removed. (breaking)
Fixed a hashCode() bug in OrderGlobalStep and OrderLocalStep.
Added OrderLimitStrategy which will ensure that partitions are limited before being merged in OLAP.
ComparatorHolder now separates the traversal from the comparator. (breaking)
Bumped to Apache Spark 1.6.1.
If no Spark serializer is provided then GryoSerializer is the default, not JavaSerializer.
Added Operator.sumLong as a optimized binary operator intended to be used by Memory reducers that know they are dealing with longs.
Traversers from ComputerResultStep are no longer attached. Attaching is only used in TinkerPop’s test suite via System.getProperties().
Fixed a hashCode()/equals() bug in MessageScope.
Fixed a severe Traversal cloning issue that caused inconsistent TraversalSideEffects.
TraversalSideEffects remain consistent and usable across multiple chained OLAP jobs.
Added MemoryTraversalSideEffects which wraps Memory in a TraversalSideEffects for use in OLAP.
TraversalSideEffects are now fully functional in OLAP save that an accurate global view is possible at the start of an iteration (not during).
Updated the TraversalSideEffects API to support registered reducers and updated get()-semantics. (breaking)
Split existing profile() into ProfileStep and ProfileSideEffectStep.
The profile()-step acts like a reducing barrier and emits TraversalMetrics without the need for cap(). (breaking)
Added LocalBarrier interface to allow traversers to remain distributed during an iteration so as to reduce cluster traffic.
Added NoOpBarrierStep as a LocalBarrier implementation of LambdaCollectingBarrierStep(noOp).
AggregateStep implements LocalBarrier and thus, doesn’t needlessly communicate its barrier traversers.
Fixed an OLAP-based Barrier synchronization bug.
Fixed a semantic bug in BranchStep (and inheriting steps) where barriers reacted locally. (breaking)
Added MemoryComputeKey for specification of Memory keys in VertexProgram. (breaking)
Added VertexComputeKey for specification of vertex compute properties in VertexProgram. (breaking)
Added and, or, and addAll to Operator.
Memory API changed to support setting and adding values for reduction. (breaking)
Memory keys can be marked as broadcast and only those values are sent to workers on each iterator.
Memory keys can be marked transient and thus deleted at the end of the OLAP job.
Vertex compute keys can be marked transient and thus deleted at the end of the OLAP job.
VertexProgram API changed to support MemoryComputeKey and VertexComputeKey. (breaking)
TraversalVertexProgram able to execute OLAP and OLTP traversal sections dynamically within the same job.
Removed FinalGet interface as all post processing of reductions should be handled by the reducing step explicitly. (breaking)
Simplified all SupplyingBarrierStep implementations as they no longer require MapReduce in OLAP.
Simplified all CollectingBarrierStep implementations as they no longer require MapReduce in OLAP.
Simplified all ReducingBarrierStep implementations as they no longer require MapReduce in OLAP.
All steps in OLAP that used MapReduce now use Memory to do their reductions which expands the list of legal traversals.
GroupStep simplified with GroupHelper.GroupMap no longer being needed. Related to the removal of FinalGet.
OLAP side-effects that are no longer generated by MapReduce are simply stored in ComputerResult.Memory w/ no disk persistence needed. (breaking)
Added Generate step interface which states that there could be a final generating phase to a side-effect or reduction (e.g. GroupStep).
Barrier step interface is now the means by which non-parallel steps communicate with their counterparts in OLAP.
Added MemoryComputing step interface which states that the step uses MemoryComputeKeys for its computation in OLAP.
Added PeerPressureVertexProgramStep and GraphTraversal.peerPressure().
Added PureTraversal for handling pure and compiled versions of a Traversal. Useful in OLAP.
Added ScriptTraversal which allows for delayed compilation of script-based Traversals.
Simplified VertexProgram implementations with a PureTraversal-model and deprecated ConfigurationTraversal.
Simplified script-based Traversals via ScriptTraversal and deprecated TraversalScriptFunction and TraversalScriptHelper.
Added TimesModulating interface which allows the Step to decide how a times()-modulation should be handled.
Added ByModulating interface which allows the Step to decide how a by()-modulation should be handled. (breaking)
Simplified the by()-modulation patterns of OrderGlobalStep and OrderLocalStep.
Added GraphComputerTest.shouldSupportPreExistingComputeKeys() to ensure existing compute keys are "revived." (breaking)
Added GraphComputerTest.shouldSupportJobChaining() to ensure OLAP jobs can be linearly chained. (breaking)
Fixed a bug in both SparkGraphComputer and GiraphGraphComputer regarding source data access in job chains.
Expanded job chaining test coverage for GraphComputer providers.
Added TraversalHelper.onGraphComputer(traversal).
MapReduce.map() no longer has a default implementation. This method must be implemented. (breaking)
TraversalVertexProgram can work without a GraphStep start.
Added PageRankVertexProgramStep and GraphTraversal.pageRank().
Added TraversalVertexProgramStep to support OLAP traversal job chaining.
Added VertexProgramStrategy which compiles multiple OLAP jobs into a single traversal.
Simplified the comparator model in OrderGlobalStep and OrderLocalStep.
Refactored TraversalSource model to allow fluent-method construction of TraversalSources.
Deprecated the concept of a TraversalSource.Builder.
Removed the concept of a TraversalEngine. All Traversal modulations are now mediated by TraversalStrategies. (breaking)
Added SideEffectStrategy for registering sideEffects in a spawned Traversal.
Added SackStrategy for registering a sack for a spawned Traversal.
Added RequirementsStrategy and RequirementsStep for adding dynamic TraverserRequirements to a Traversal.
Removed EngineDependentStrategy.
Renamed step interface EngineDependent to GraphComputing with method onGraphComputer(). (breaking)
Cleaned up various TraversalStrategy tests now that TraversalEngine no longer exists.
Added GraphFilter to support filtering out vertices and edges that won’t be touched by an OLAP job.
Added GraphComputer.vertices() and GraphComputer.edges() for GraphFilter construction. (breaking)
SparkGraphComputer, GiraphGraphComputer, and TinkerGraphComputer all support GraphFilter.
Added GraphComputerTest.shouldSupportGraphFilter() which verifies all filtered graphs have the same topology.
Added GraphFilterAware interface to hadoop-gremlin/ which tells the OLAP engine that the InputFormat handles filtering.
GryoInputFormat and ScriptInputFormat implement GraphFilterAware.
Added GraphFilterInputFormat which handles graph filtering for InputFormats that are not GraphFilterAware.
Fixed a bug in TraversalHelper.isLocalStarGraph() which allowed certain illegal traversals to pass.
Added TraversalHelper.isLocalProperties() to verify that the traversal does not touch incident edges.
GraphReader I/O interface now has Optional<Vertex> readGraph(InputStream, GraphFilter). Default UnsupportedOperationException.
GryoReader does not materialize edges that will be filtered out and this greatly reduces GC and load times.
Created custom Serializers for SparkGraphComputer message-passing classes which reduce graph sizes significantly.

Bugs

TINKERPOP-951 Barrier steps provide unexpected results in Gremlin OLAP
TINKERPOP-1057 GroupSideEffectStep doesn’t use provided maps
TINKERPOP-1103 Two objects fighting for local variable name in Gremlin Console (breaking)
TINKERPOP-1149 TraversalXXXSteps Aren’t Providing SideEffects
TINKERPOP-1181 select(Column) should not use a LambdaMapStep
TINKERPOP-1188 Semantics of BarrierSteps in TraversalParent global traversals is wrong. (breaking)
TINKERPOP-1194 explain() seems broken
TINKERPOP-1217 Repeated Logging of "The HadoopPools has not been initialized, using the default pool"

Improvements

TINKERPOP-570 [Proposal] Provide support for OLAP to OLTP to OLAP to OLTP
TINKERPOP-575 Implement RemoteGraph
TINKERPOP-813 [Proposal] Make the Gremlin Graph Traversal Machine and Instruction Set Explicit
TINKERPOP-872 Remove GroupCountStep in favor of new Reduce-based GroupStep
TINKERPOP-890 Remove the concept of branch/ package. (breaking)
TINKERPOP-958 Improve usability of .profile() step.
TINKERPOP-962 Provide "vertex query" selectivity when importing data in OLAP. (breaking)
TINKERPOP-968 Add first class support for an optional traversal
TINKERPOP-971 TraversalSource should be fluent like GraphComputer (breaking)
TINKERPOP-1016 Replace junit-benchmarks with JMH
TINKERPOP-1021 Deprecate Order.valueIncr, Order.valueDecr, Order.keyIncr, and Order.keyDecr (breaking)
TINKERPOP-1032 Clean up the conf/hadoop configurations
TINKERPOP-1034 Bump to support Spark 1.5.2
TINKERPOP-1069 Support Spark 1.6.0
TINKERPOP-1082 INPUT_RDD and INPUT_FORMAT are bad, we should just have one key.
TINKERPOP-1112 Create GryoSerializers for the Spark Payload classes.
TINKERPOP-1121 FileSystemStorage needs to be smart about /.
TINKERPOP-1132 Messenger.receiveMessages() Iterator should .remove().
TINKERPOP-1140 TraversalVertexProgramStep in support of OLAP/OLTP conversions.
TINKERPOP-1153 Add ByModulating and TimesModulating interfaces.
TINKERPOP-1154 Create a ScriptTraversal which is Serializable and auto-compiles.
TINKERPOP-1162 Add VertexProgram.getTransientComputeKeys() for removing scratch-data. (breaking)
TINKERPOP-1163 GraphComputer’s can have TraversalStrategies.
TINKERPOP-1164 ReducingBarriersSteps should use ComputerMemory, not MapReduce.
TINKERPOP-1166 Add Memory.reduce() as option to Memory implementations. (breaking)
TINKERPOP-1173 If no Serializer is provided in Configuration, use GryoSerializer by default (Spark)
TINKERPOP-1180 Add more optimized binary operators to Operator.
TINKERPOP-1192 TraversalSideEffects should support registered reducers (binary operators).
TINKERPOP-1193 Add a LocalBarrier interface.
TINKERPOP-1199 Use "MicroMetrics" as the mutator of the TraversalMetrics.
TINKERPOP-1206 ExpandableIterator can take a full TraverserSet at once — Barriers.
TINKERPOP-1209 ComparatorHolder should returns a Pair<Traversal,Comparator>. (breaking)
TINKERPOP-1210 Provide an OrderLimitStep as an optimization.
TINKERPOP-1219 Create a test case that ensures the provider’s compilation of g.V(x) and g.V().hasId(x) is identical (breaking)
TINKERPOP-1222 Allow default GraphComputer configuration
TINKERPOP-1223 Allow jars in gremlin.distributedJars to be read from HDFS
TINKERPOP-1225 Do a "rolling reduce" for GroupXXXStep in OLAP.
TINKERPOP-1227 Add Metrics for the TraversalOpProcessor
TINKERPOP-1234 program() step that takes arbitrary vertex programs
TINKERPOP-1236 SelectDenormalizationStrategy for select().by(starGraph) in OLAP.
TINKERPOP-1237 ProjectMap: For the Love of Die Faterland
TINKERPOP-1238 Re-use Client instances in RemoteGraph tests

TinkerPop 3.1.0 (A 187 On The Undercover Gremlinz)

TinkerPop 3.1.8 (Release Date: August 21, 2017)

Fixed a MessageScope bug in TinkerGraphComputer.
Fixed a bug in BigDecimal divisions in NumberHelper that potentially threw an ArithmeticException.
Non-deserializable exceptions no longer added to ScriptRecordReader IOExceptions.

Bugs

TINKERPOP-1519 TinkerGraphComputer doesn’t handle multiple MessageScopes in single iteration
TINKERPOP-1736 Sack step evaluated by Groovy interprets numbers in an unexpected way
TINKERPOP-1754 Spark can not deserialise some ScriptRecordReader parse exceptions

TinkerPop 3.1.7 (Release Date: June 12, 2017)

Configured Modern and The Crew graphs to work with a integer IdManager when TinkerFactory.createXXX() is called.
Added XSLT transform option to convert TinkerPop 2.x GraphML to 3.x GraphML.
Added validation to StarVertexProperty.
Bumped to Jackson 2.8.7.
Fixed EventStrategy so that newly added properties trigger events with the name of the key that was added.
Drop use of jitpack for the jbcrypt artifact - using the official one in Maven Central.
Bumped to Groovy 2.4.11.

Improvements

TINKERPOP-1504 MutationListener doesn’t provide property key on property additions
TINKERPOP-1608 TP2-to-TP3 GraphML XSLT
TINKERPOP-1633 Use org.mindrot:jbcrypt v0.4
TINKERPOP-1645 Bump to Groovy 2.4.9
TINKERPOP-1654 Upgrade to jackson-databind 2.8.6+ in gremlin-shaded
TINKERPOP-1659 Docker build should use maven settings.xml
TINKERPOP-1664 StarVertexProperty#property should throw an NPE if the value is null

TinkerPop 3.1.6 (Release Date: February 3, 2017)

Fixed bug in IncidentToAdjacentStrategy, it was missing some invalidating steps.
Returned a confirmation on session close from Gremlin Server.
Use non-default port for running tests on Gremlin Server.
Fully shutdown metrics services in Gremlin Server on shutdown.
Deprecated tryRandomCommit() in AbstractGremlinTest - the annotation was never added in 3.1.1, and was only deprecated via javadoc.
Minor fixes to various test feature requirements in gremlin-test.
Allow developers to pass options to docker run with TINKERPOP_DOCKER_OPTS environment variable

Bugs

TINKERPOP-1493 Groovy project doesn’t build on Windows
TINKERPOP-1545 IncidentToAdjacentStrategy is buggy

Improvements

TINKERPOP-1538 Gremlin Server spawned by test suites should use a different port
TINKERPOP-1544 Return a confirmation of session close
TINKERPOP-1556 Allow Hadoop to run on IPv6 systems
TINKERPOP-1557 Improve docker build time with this one weird trick!
TINKERPOP-1598 Bump to Grovy 2.4.8

TinkerPop 3.1.5 (Release Date: October 17, 2016)

Improved handling of Cluster.close() and Client.close() to prevent the methods from hanging.
Fixed a bug in NotStep where child requirements were not being analyzed.
Fixed output redirection and potential memory leak in GremlinGroovyScriptEngine.
Corrected naming of g_withPath_V_asXaX_out_out_mapXa_name_it_nameX and g_withPath_V_asXaX_out_mapXa_nameX in MapTest.
Improved session cleanup when a close is triggered by the client.
Removed the appveyor.yml file as the AppVeyor build is no longer enabled by Apache Infrastructure.
Fixed TinkerGraph which was not saving on close() if the path only consisted of the file name.
Fixed a bug in RangeByIsCountStrategy which didn’t use the NotStep properly.

Bugs

TINKERPOP-1158 gremlin.sh -v emits log4j initialization errors
TINKERPOP-1391 issue with where filter
TINKERPOP-1442 Killing session should make better attempt to cleanup
TINKERPOP-1451 TinkerGraph persistence cannot handle a single file name as the graph location
TINKERPOP-1467 Improve close() operations on the Java driver
TINKERPOP-1478 Propogate ScriptEngine fixes from groovy to GremlinGroovyScriptEngine
TINKERPOP-1512 gremlin-server-classic.yaml is broken

Improvements

TINKERPOP-927 bin/publish-docs.sh should only upload diffs.
TINKERPOP-1264 Improve BLVP docs
TINKERPOP-1477 Make DependencyGrabberTest an integration test

TinkerPop 3.1.4 (Release Date: September 6, 2016)

Improved the error provided by a client-side session if no hosts were available.
Fixed a bug in PropertiesTest which assumed long id values.
Fixed a bug in StarGraph around self-edges.
Fixed a potential leak of a ReferenceCounted resource in Gremlin Server.
Renamed distributions to make the prefix "apache-tinkerpop-" as opposed to just "apache-".
Fixed a problem (previously thought resolved on 3.1.3) causing Gremlin Server to lock up when parallel requests were submitted on the same session if those parallel requests included a script that blocked indefinitely.
Fixed bug in TailGlobalStep where excess bulk was not accounted for correctly.

Bugs

TINKERPOP-1350 Server locks when submitting parallel requests on session
TINKERPOP-1375 Possible ByteBuf leak for certain transactional scenarios
TINKERPOP-1377 Closing a remote in "console mode" has bad message
TINKERPOP-1379 unaccounted excess in TailGlobalStep
TINKERPOP-1397 StarVertex self edge has buggy interaction with graph filters
TINKERPOP-1419 Wrong exception when a SessionedClient is initialized with no available host

Improvements

TINKERPOP-989 Default documentation should be reference/index.html
TINKERPOP-1376 Rename TinkerPop artifacts
TINKERPOP-1413 PropertiesTest#g_V_hasXageX_propertiesXnameX assumes that ids are longs
TINKERPOP-1416 Write Gremlin Server log files somewhere during doc generation
TINKERPOP-1418 CoreTraversalTests depend on missing functionality

TinkerPop 3.1.3 (Release Date: July 18, 2016)

Fixed bug in SubgraphStep where features were not being checked properly prior to reading meta-properties.
Ensured calls to Result.hasNext() were idempotent.
Avoid hamcrest conflict by using mockito-core instead of mockito-all dependency in gremlin-test.
Fixed bug in GremlinExecutor causing Gremlin Server to lock up when parallel requests were submitted on the same session if those parallel requests included a script that blocked indefinitely.
Changed GremlinExecutor timeout scheduling so that the timer would not start until a time closer to the actual start of script evaluation.
Fixed bug in SubgraphStrategy where step labels were not being propogated properly to new steps injected by the strategy.
Fix incorrect test FeatureRequirement annotations.
Defaulted to Edge.DEFAULT if no edge label was supplied in GraphML.
Fixed bug in IoGraphTest causing IllegalArgumentException: URI is not hierarchical error for external graph implementations.
Fixed bug in GremlinGroovyScriptEngineFileSandboxTest resource loading
Improved TinkerGraph performance when iterating vertices and edges.
Fixed a bug where timeout functions provided to the GremlinExecutor were not executing in the same thread as the script evaluation.
Fixed a bug in the driver where many parallel requests over a session would sometimes force a connection to close and replace itself.
Graph providers should no longer rely on the test suite to validate that hyphens work for property keys.
Optimized a few special cases in RangeByIsCountStrategy.
Added more "invalid" variable bindings to the list used by Gremlin Server to validate incoming bindings on requests.
Fixed a bug where the ConnectionPool in the driver would not grow with certain configuration options.
Fixed a bug where pauses in Gremlin Server writing to an overtaxed client would generate unexpected FastNoSuchElementException errors.
Named the thread pool used by Gremlin Server sessions: "gremlin-server-session-$n".
Fixed a bug in BulkSet.equals() which made itself apparent when using store() and aggregate() with labeled cap().
Fixed a bug where Result.one() could potentially block indefinitely under certain circumstances.
Ensured that all asserts of vertex and edge counts were being applied properly in the test suite.
Fixed bug in gremlin-driver where certain channel-level errors would not allow the driver to reconnect.
SubgraphStep now consults the parent graph features to determine cardinality of a property.
Use of Ctrl-C in Gremlin Console now triggers closing of open remotes.
Bumped SLF4J to 1.7.21 as previous versions suffered from a memory leak.
Fixed a bug in Neo4jGraphStepStrategy where it wasn’t defined properly as a ProviderOptimizationStrategy.
Renamed AndTest.get_g_V_andXhasXage_gt_27XoutE_count_gt_2X_name to get_g_V_andXhasXage_gt_27XoutE_count_gte_2X_name to match the traversal being tested.
Fixed a self-loop bug in StarGraph.
Added configuration option for disabling :remote timeout with :remote config timeout none.
Added init-tp-spark.sh to Gremlin Console binary distribution.
Fixed bug where use of :x in a Gremlin Console initialization script would generate a stack trace.
Added configuration options to Gremlin Driver and Server to override the SSL configuration with an SslContext.
Added driver configuration settings for SSL: keyCertChainFile, keyFile and keyPassword.
Fixed bug where transaction managed sessions were not properly rolling back transactions for exceptions encountered during script evaluation.
Fixed bug in :uninstall command if the default /ext directory was not used.
Added support to Gremlin Driver to allow either plain text or GSSAPI SASL authentication allowing the client to pass the SASL mechanism in the request.
Improved dryRun functionality for the docs processor. It’s now possible to dry run (or full run) only specific files.
Added precompile of ScriptInputFormat scripts to ScriptRecordReader to improve performance.

Bugs

TINKERPOP-906 Install plugin always fails after first unresolved dependency
TINKERPOP-1088 Preserve Cardinality in Subgraph
TINKERPOP-1092 Gremlin Console init script with :x throws exception
TINKERPOP-1139 [Neo4JGraph] GraphTraversal with SubgraphStrategy removes addLabelStep (as("b"))
TINKERPOP-1196 Calls to Result.one() might block indefinitely
TINKERPOP-1215 Labeled a SideEffectCapStep cause problems.
TINKERPOP-1242 ScriptEngineTest randomly hangs indefinately.
TINKERPOP-1257 Bad SackTest variable use.
TINKERPOP-1265 Managed Session Eval Exceptions Rollback
TINKERPOP-1272 Gremlin Console distribution needs bin/init-tp-spark.sh
TINKERPOP-1284 StarGraph does not handle self-loops correctly.
TINKERPOP-1300 Many asserts around vertex/edge counts on graphs not applied
TINKERPOP-1317 IoGraphTest throws error: URI is not hierarchical
TINKERPOP-1318 java.lang.NoSuchMethodError: org/hamcrest/Matcher.describeMismatch
TINKERPOP-1319 several FeatureRequirement annotations are incorrect in gremlin-test
TINKERPOP-1320 GremlinGroovyScriptEngineFileSandboxTest throws error: URI is not hierarchical
TINKERPOP-1324 Better error for invalid args to addV()
TINKERPOP-1350 Server locks when submitting parallel requests on session
TINKERPOP-1351 Number of connections going beyond the pool max size
TINKERPOP-1352 Connection Pool doesn’t always grow
TINKERPOP-1359 Exception thrown when calling subgraph() on Neo4jGraph
TINKERPOP-1360 intermittent error in spark-gremlin integration test

Improvements

TINKERPOP-939 Neo4jGraph should support HighAvailability (Neo4jHA).
TINKERPOP-1003 Setting up latest/current links for bins and docs.
TINKERPOP-1020 Provide --dryRun selectivity for "half publishing" docs.
TINKERPOP-1063 TinkerGraph performance enhancements
TINKERPOP-1229 More Descriptive Messaging for :remote console
TINKERPOP-1260 Log for validate-distribution.sh
TINKERPOP-1263 Pass SASL mechanism name through with initial SASL response
TINKERPOP-1267 Configure Console for no timeout on remote requests
TINKERPOP-1269 More SSL settings for driver
TINKERPOP-1295 Precompile ScriptInputFormat scripts once during initialization of ScriptRecordReader
TINKERPOP-1301 Provide Javadoc for ScriptInput/OutputFormat’s
TINKERPOP-1302 Ctrl-C should kill open remotes in Console
TINKERPOP-1312 .count().is(0) is not properly optimized
TINKERPOP-1314 Improve error detection in docs preprocessor
TINKERPOP-1354 Include all static enum imports in request validation for bindings (breaking)

TinkerPop 3.1.2 (Release Date: April 8, 2016)

Fixed two NullPointerException-potential situations in ObjectWritable.
Provided Docker script that allows the execution of several build tasks within a Docker container.
Added a per-request scriptEvaluationTimeout option to the Gremlin Server protocol.
Changed DriverRemoteAcceptor to send scripts as multi-line.
Fixed a bug in gremlin-driver where connections were not returning to the pool after many consecutive errors.
Fixed a bug where tree() did not serialize into GraphSON.
Bumped to SLF4j 1.7.19.
Bumped to Apache Hadoop 2.7.2.
Fixed a bug in gremlin-driver where a really fast call to get a Future to wait for a result might not register an error raised from the server.
Fixed a severe bug where LP_O_OB_P_S_SE_SL_Traverser was not registered with GryoMapper.
The future from GremlinExecutor.eval() is completed after the entire evaluation lifecyle is completed.
Spark Memory uses collect().iterator() instead of toLocalIterator() to reduce noise in Spark UI.
Added the :remote console option which flips the Gremlin Console into a remote-only mode where all script evaluation is routed to the currently configured remote, which removes the need to use the :> command.
Added allowRemoteConsole() to the RemoteAcceptor interface.
The :remote for tinkerpop.server now includes an option to establish the connection as a "session".
Provided an implementation for calls to SessionedClient.alias(), which formerly threw an UnsupportedOperationException.
Bumped to commons-collections 3.2.2.
Fixed a bug where OrderGlobalStep and OrderLocalStep were not incorporating their children’s traverser requirements.
Fixed a compilation bug in TraversalExplanation.
Fixed bug where a session explicitly closed was being closed again by session expiration.
Improved the recovery options for gremlin-driver after failed requests to Gremlin Server.
Added maxWaitForSessionClose to the settings for gremlin-driver.
Bumped to Netty 4.0.34.Final.
Added "interpreter mode" for the ScriptEngine and Gremlin Server which allows variables defined with def or a type to be recognized as "global".
Bumped to Apache Groovy 2.4.6.
Added the gremlin-archetype-server archetype that demonstrates
Added the gremlin-archetype-tinkergraph archetype that demonstrates a basic project that uses TinkerGraph.
Added gremlin-archetype module to house TinkerPop "examples".
Fixed a condition where ConnectionPool initialization in the driver would present a NullPointerException on initialization if there were errors constructing the pool in full.
Fixed a bug in the round-robin load balancing strategy in the driver would waste requests potentially sending messages to dead hosts.
Added new Provider Documentation book - content for this book was extracted from the reference documentation.
Fixed a bug where multiple "close" requests were being sent by the driver on Client.close().
Fixed an Property attach bug that shows up in serialization-based GraphComputer implementations.
Fixed a pom.xml bug where Gremlin Console/Server were not pulling the latest Neo4j 2.3.2.
Fixed bug in "round robin" load balancing in gremlin-driver where requests were wrongly being sent to the same host.
Prevented the spawning of unneeded reconnect tasks in gremlin-driver when a host goes offline.
Fixed bug preventing gremlin-driver from reconnecting to Gremlin Server when it was restarted.
Better handled errors that occurred on commits and serialization in Gremlin Server to first break the result iteration loop and to ensure commit errors were reported to the client.
Added GraphSON serializers for the java.time.* classes.
Improved the logging of the Gremlin Server REST endpoint as it pertained to script execution failures.
TraversalExplanation is now Serializable and compatible with GraphSON and Gryo serialization.
Fixed a problem with global bindings in Gremlin Server which weren’t properly designed to handle concurrent modification.
Deprecated ScriptElementFactory and made the local StarGraph globally available for ScriptInputFormat's parse() method.
Improved reusability of unique test directory creation in /target for AbstractGraphProvider, which was formerly only available to Neo4j, by adding makeTestDirectory().
Optimized memory-usage in TraversalVertexProgram.
Graph instances are not merely "closed" at the end of tests, they are "cleared" via GraphProvider.clear(), which should in turn cleans up old data for an implementation.
Expanded the Gremlin Server protocol to allow for transaction management on in-session requests and updated the gremlin-driver to take advantage of that.
Greatly reduced the amount of objects required in OLAP for the ReducingBarrierStep steps.
Improved messages for the different distinct "timeouts" that a user can encounter with Gremlin Server.

Bugs

TINKERPOP-1041 StructureStandardTestSuite has file I/O issues on Windows
TINKERPOP-1105 SparkGraphComputer / Null Pointer Exceptions for properties traversals
TINKERPOP-1106 Errors on commit in Gremlin Server don’t register as exception on driver
TINKERPOP-1125 RoundRobin load balancing always uses the second Host when size = 2
TINKERPOP-1126 A single Host spawns many reconnect tasks
TINKERPOP-1127 client fails to reconnect to restarted server
TINKERPOP-1146 IoTest are not clearing the db after the test run
TINKERPOP-1148 ConcurrentModificationException with bindings in Gremlin Server
TINKERPOP-1150 Update pom file dependencies to work with Neo4j 2.3.2
TINKERPOP-1159 Client sends multiple session close messages per host
TINKERPOP-1168 Switch plugins in docs preprocessor
TINKERPOP-1172 Reconnect to Gremlin Server previously marked as dead
TINKERPOP-1175 Anonymous traversals can’t be explained
TINKERPOP-1184 Sessions not being closed properly
TINKERPOP-1216 OrderStep or O_Traverser is broken
TINKERPOP-1239 Excessive continual failure for requests can cause TimeoutException in driver
TINKERPOP-1245 Gremlin shell starts incorrectly on OS X due to awk difference
TINKERPOP-1251 NPE in ObjectWritable.toString
TINKERPOP-1252 Failed Neo4j transaction can leave Neo4jTransaction in inconsistent state

Improvements

TINKERPOP-732 gremlin-server GraphSON serializer issue with tree()
TINKERPOP-916 Develop a better "simple" driver for testing and example purposes
TINKERPOP-937 Extract the implementations sections of the primary documentation to its own book
TINKERPOP-956 Connection errors tend to force a complete close of the channel
TINKERPOP-1039 Enable auto-commit for session’d requests.
TINKERPOP-1068 Bump to support jbcrypt-0.4m.jar
TINKERPOP-1080 Bump Netty version - 4.0.34.Final
TINKERPOP-1085 Establish TinkerPop "example" projects
TINKERPOP-1096 Support aliasing for sessions in Gremlin Server
TINKERPOP-1097 Gremlin Console supporting sessions
TINKERPOP-1107 Provide a way to support global variables with sandboxing enabled
TINKERPOP-1109 Make Gremlin Console better suited for system level installs
TINKERPOP-1131 TraversalVertexProgram traverser management is inefficient memory-wise.
TINKERPOP-1135 Improve GraphSON representation of java.time.* classes
TINKERPOP-1137 Deprecate ScriptElementFactory and make star graph globally available
TINKERPOP-1138 Improve messaging on server timeouts
TINKERPOP-1147 Add serialization for TraversalExplanation
TINKERPOP-1160 Add timeout configuration for time to wait for connection close
TINKERPOP-1165 Tooling Support: Compile with -parameters
TINKERPOP-1176 Bump Groovy version - 2.4.6
TINKERPOP-1177 Improve documentation around Spark’s storage levels
TINKERPOP-1197 Document Gremlin Server available metrics
TINKERPOP-1198 Bump commons-collections to 3.2.2
TINKERPOP-1213 missing docs for has(label, key, value)
TINKERPOP-1218 Usage of toLocalIterator Produces large amount of Spark Jobs

TinkerPop 3.1.1 (Release Date: February 8, 2016)

Made GryoRecordReader more robust to 0 byte record splits.
Fixed a constructor/serialization bug in LP_O_OB_S_SE_SL_Traverser.
Added a lazy iterator, memory safe implementation of MapReduce to SparkGraphComputer.
Added MapReduce.combine() support to SparkGraphComputer.
Bumped to Neo4j 2.3.2.
Fixed Java comparator contract issue around Order.shuffle.
Optimized a very inefficient implementation of SampleLocalStep.
Reduced the complexity and execution time of all AbstractLambdaTraversal instances.
DefaultTraversal has a well defined hashCode() and equals().
Added serializers to Gryo for java.time related classes.
Integrated NumberHelper in SackFunctions.
Deprecated VertexPropertyFeatures.supportsAddProperty() which effectively was a duplicate of VertexFeatures.supportsMetaProperties.
The Spark persistence StorageLevel can now be set for both job graphs and PersistedOutputRDD data.
Added to the list of "invalid binding keys" allowed by Gremlin Server to cover the private fields of T which get exposed in the ScriptEngine on static imports.
Added BulkDumperVertexProgram that allows to dump a whole graph in any of the supported IO formats (GraphSON, Gryo, Script).
Fixed a bug around duration calculations of cap()-step during profiling.
It is possible to completely avoid using HDFS with Spark if PersistedInputRDD and PersistedOutpuRDD are leveraged.
InputRDD and OutputRDD can now process both graphs and memory (i.e. sideEffects).
Removed Groovy specific meta-programming overloads for handling Hadoop FileSystem (instead, its all accessible via FileSystemStorage).
Added FileSystemStorage and SparkContextStorage which both implement the new Storage API.
Added Storage to the gremlin-core io-package which providers can implement to allow conventional access to data sources (e.g. ls(), rm(), cp(), etc.).
Bumped to Spark 1.5.2.
Bumped to Groovy 2.4.5.
Added --noClean option in bin/process-docs.sh to prevent the script from cleaning Grapes and HDFS.
Execute the LifeCycle.beforeEval() in the same thread that eval() is executed in for GremlinExecutor.
Improved error handling of Gremlin Console initialization scripts to better separate errors in initialization script I/O versus execution of the script itself.
Fixed a bug in Graph.OptOut when trying to opt-out of certain test cases with the method property set to "*".
Added another BulkLoader implementation (OneTimeBulkLoader) that doesn’t store temporary properties in the target graph.
Added option to allow for a custom ClassResolver to be assigned to a GryoMapper instance.
Fixed a SparkGraphComputer sorting bug in MapReduce that occurred when there was more than one partition.
Added strictTransactionManagement to the Gremlin Server settings to indicate that the aliases parameter must be passed on requests and that transaction management will be scoped to the graphs provided in that argument.
Fixed a NullPointerException bug in PeerPressureVertexProgram that occurred when an adjacency traversal was not provided.
Standardized "test data directories" across all tests as generated by TestHelper.
Fixed a bug in Gremlin Server where error messages were not always being passed back in the statusMessage field of the ResponseMessage.
Added validation for parameter bindings to ensure that keys were String values.
Improved Transaction Management consistency in Gremlin Server.
Added FileSandboxExtension which takes a configuration file to white list methods and classes that can be used in ScriptEngine execution.
Deprecated SandboxExtension and SimpleSandboxExtension in favor of AbstractSandboxExtension which provides better abstractions for those writing sandboxes.
Fixed a long standing "view merge" issue requiring reduceByKey() on input data to Spark. It is no longer required.
Added Spark static object to allow "file system" control of persisted RDDs in Spark.
Added a Spark "job server" to ensure that persisted RDDs are not garbage collected by Spark.
Improved logging control during builds with Maven.
Fixed settings that weren’t being passed to the Gremlin Driver Cluster through configuration file.
Column now implements Function. The modulator by(valueDecr) can be replaced by by(values,decr) and thus, projection and order are separated.
Added InputRDDFormat which wraps an InputRDD to make it accessible to Hadoop and not just Spark.
Added AbstractSparkTest which handles closing SparkContext instances between tests now that we support persisted contexts.
Fixed a serialization bug in GryoSerializer that made it difficult for graph providers to yield InputRDDs for SparkGraphComputer.
SparkGraphComputer is now tested against Gryo, GraphSON, and InputRDD data sources.
HadoopElementIterator (for Hadoop-Gremlin OLTP) now works for any InputFormat, not just FileInputFormats.
Added Traverser.Admin.getTags() which are used to mark branches in a traversal (useful in match() and related future steps).
Fixed the Future model for GiraphGraphComputer and SparkGraphComputer so that class loaders are preserved.
Added support for arbitrary vertex ID types in BulkLoaderVertexProgram.
Deprecated credentialsDbLocation from SimpleAuthenticator in Gremlin Server.
TinkerGraph has "native" serialization in GraphSON, which enables it to be a return value from Gremlin Server.
Improved the ability to embed Gremlin Server by providing a way to get the ServerGremlinExecutor and improve reusability of AbstractEvalOpProcessor and related classes.
Added Authenticator.newSaslNegotiator(InetAddress) and deprecated the zero-arg version of that method.
ProfileStep is now available off of Traversal via profile(). To be consistent with Traversal.explain().
If no comparator is provided to order(), Order.incr is assumed (previously, an exception occurred).
Fixed various Gremlin-Groovy tests that assumed toString()-able ids.
Split TinkerPop documentation into different directories.
Added explain()-step which yields a TraversalExplanation with a pretty toString() detailing the compilation process.
Fixed a traversal strategy ordering bug in AdjacentToIncidentStrategy and IncidentToAdjacentStrategy.
Made a number of changes to improve traversal startup and execution performance.
Added support for 'gremlin.tinkergraph.graphLocation' to accept a fully qualified class name that implements Io.Builder interface.

Bugs

TINKERPOP-763 IsStep broken when profiling is enabled.
TINKERPOP-972 Cluster::close does not shut down its executor
TINKERPOP-973 BLVP shouldn’t clear configuration properties
TINKERPOP-976 Fail earlier if invalid version is supplied in validate-distribution.sh
TINKERPOP-977 Dead link to traversal javadocs
TINKERPOP-979 ComputerVerificationStrategy not picking up Order local traversal
TINKERPOP-985 shouldPersistDataOnClose makes incorrect feature check
TINKERPOP-990 Mixed types in VertexPropertyTest
TINKERPOP-993 cyclicPath is not(simplePath)
TINKERPOP-997 FeatureRequirementSet.SIMPLE should not require multi-property (breaking)
TINKERPOP-1000 GremlinGroovyScriptEngineOverGraphTest failures
TINKERPOP-1001 SugarLoaderPerformanceTest contains hardcoded vertex ids
TINKERPOP-1002 Should rollback transaction after catching on close
TINKERPOP-1006 Random error during builds: shouldReloadClassLoaderWhileDoingEvalInSeparateThread()
TINKERPOP-1011 HadoopGraph can’t re-attach when the InputFormat is not a FileInputFormat
TINKERPOP-1012 BulkLoaderVertexProgram shouldn’t assume vertex IDs of type Long
TINKERPOP-1025 Solve SparkContext Persistence Issues with BulkLoaderVertexProgram
TINKERPOP-1027 Merge view prior to writing graphRDD to output format/rdd
TINKERPOP-1036 Support self-looping edges in IO
TINKERPOP-1052 @Graph.OptOut causes Exception during Suite setup
TINKERPOP-1060 LambdaRestrictionStrategy too restrictive
TINKERPOP-1075 Profile duration of cap step seems broken.
TINKERPOP-1083 Traversal needs a hashCode() and equals() definition.
TINKERPOP-1089 Order.shuffle implementation is too fragile
TINKERPOP-1119 LP_O_OB_S_SE_SL_Traverser doesn’t have a protected constructor().

Improvements

TINKERPOP-320 BulkDumperVertexProgram
TINKERPOP-379 MessageScope.Local.setStaticMessage(M msg)
TINKERPOP-824 Do we need runtime BigDecimal in more places?
TINKERPOP-859 Provide a more general way to set log levels in plugins
TINKERPOP-860 Bindings applied to the PluginAcceptor should appear to Gremlin Server
TINKERPOP-886 Allow any GraphReader/Writer to be persistence engine for TinkerGraph
TINKERPOP-891 Re-examine Sandboxing Abstractions
TINKERPOP-912 Improve the ability to embed Gremlin Server with Channelizer injection
TINKERPOP-928 Use directories to separate different books
TINKERPOP-930 Tie Alias to Transaction Manager in Gremlin Server
TINKERPOP-938 Add a "clear SNAPSHOT jars" section to the process-docs.sh.
TINKERPOP-941 Improve error message for wrong order().by() arguments
TINKERPOP-943 Warn if Gremlin Server is running prior to generating docs
TINKERPOP-945 Exceptions should allow me to include root cause if/when available
TINKERPOP-952 Include Cardinality.list example in VertexProperty section of main docs.
TINKERPOP-954 Consistent test directory usage
TINKERPOP-957 Improve speed of addV()
TINKERPOP-964 Test XXXGraphComputer on a Hadoop2 cluster (non-pseudocluster).
TINKERPOP-970 ProfileStep should be off Traversal, not GraphTraversal
TINKERPOP-978 Native TinkerGraph Serializers for GraphSON
TINKERPOP-981 Deprecate support for credentialsDbLocation in Gremlin Server Config
TINKERPOP-982 valuesDecr, valuesIncr, keysDecr, and valuesDecr is lame.
TINKERPOP-983 Provide a way to track open Graph instances in tests
TINKERPOP-984 Use GraphProvider for id conversion in Groovy Environment test suite
TINKERPOP-987 Use tinkerpop.apache.org URL in all documentation and homepage
TINKERPOP-988 SparkGraphComputer.submit shouldn’t use ForkJoinPool.commonPool
TINKERPOP-992 Better support for schema driven Graphs in IO related tests
TINKERPOP-994 Driver using deprecated Rebindings Still
TINKERPOP-995 Add Authenticator.newSaslNegotiator(InetAddress)
TINKERPOP-996 Please delete old releases from mirroring system
TINKERPOP-998 Deprecate VertexPropertyFeatures.FEATURE_ADD_PROPERTY
TINKERPOP-1009 Add a CAUTION to documentation about HadoopGraph and getting back elements
TINKERPOP-1013 Traverser tags as a safer way of using path labels
TINKERPOP-1018 Allow setting for maxContentLength to be set from yaml in driver
TINKERPOP-1019 Convert println in test to SLF4j
TINKERPOP-1022 Automatically warm up ops handlers
TINKERPOP-1023 Add a spark variable in SparkGremlinPlugin like we do hdfs for HadoopGremlinPlugin
TINKERPOP-1026 BVLP should store vertex IDs as String
TINKERPOP-1033 Store sideEffects as a persisted RDD
TINKERPOP-1035 Better Consistency in Gremlin Server Transaction Management
TINKERPOP-1045 Client-Side Hangs when attempting to access a HashMap with Keys of type Integer
TINKERPOP-1047 TinkerGraph GraphSON storage format broken
TINKERPOP-1051 Add note in best practice docs about gremlin server heap setting
TINKERPOP-1055 Gremlin Console FileNotFoundException can be misleading
TINKERPOP-1062 Make LifeCycle beforeEval execute in same thread as eval operation
TINKERPOP-1064 Allow a ClassResolver to be added to GryoMapper construction
TINKERPOP-1065 Fix some typos and clarify some wording in the TinkerPop documentation
TINKERPOP-1066 Add ioRegistries configuration to GraphSON MessageSerializer
TINKERPOP-1067 Update Groovy to 2.4.5
TINKERPOP-1072 Allow the user to set persistence options using StorageLevel.valueOf()
TINKERPOP-1073 HadoopGraph toString() is weird for Spark PersitedRDD data.
TINKERPOP-1086 Include gryo serializers for java.time related classes
TINKERPOP-1087 Add has()/order() to FilterRankStrategy
TINKERPOP-1093 Add Spark init.sh script and update dev documentation.
TINKERPOP-1100 Look deeply into adding combine()-support in Spark MapReduce.
TINKERPOP-1117 InputFormatRDD.readGraphRDD requires a valid gremlin.hadoop.inputLocation, breaking InputFormats (Cassandra, HBase) that don’t need one

TinkerPop 3.1.0 (Release Date: November 16, 2015)

This release also includes changes from 3.0.1-incubating and 3.0.2-incubating.

Fixed bug in Gryo and GraphSON (with embedded types) serialization for serialization of results returned from Map.entrySet().
Transaction settings for onReadWrite and onClose are now ThreadLocal in nature of standard transactions.
Optimized BulkLoaderVertexProgram. It now uses EventStrategy to monitor what the underlying BulkLoader implementation does (e.g. whether it creates a new vertex or returns an existing).
Integrated NumberHelper in SumStep, MinStep, MaxStep and MeanStep (local and global step variants).
Gremlin Console remoting to Gremlin Server now supports a configuration option for assigning aliases.
CountMatchAlgorithm, in OLAP, now biases traversal selection towards those traversals that start at the current traverser location to reduce message passing.
Fixed a file stream bug in Hadoop OLTP that showed up if the streamed file was more than 2G of data.
Added the ability to set thread local properties in SparkGraphComputer when using a persistent context.
Bumped to Neo4j 2.3.0.
Deprecated "rebindings" as an argument to Gremlin Server and replaced it with "aliases".
Added PersistedInputRDD and PersistedOutputRDD which enables SparkGraphComputer to store the graph RDD in the context between jobs (no HDFS serialization required).
Renamed the public static String configuration variable names of TinkerGraph (deprecated old variables).
Added GraphComputer.configure(key,value) to allow engine-specific configurations.
GraphStep is no longer in the sideEffect-package and is now in map-package (breaking change).
Added support for mid-traversal V()-steps (GraphStep semantics updated).
Fixed Number handling in Operator enums. Prior this change a lot of operations on mixed Number types returned a wrong result (wrong data type).
Fixed a bug in Gremlin Server/Driver serializer where empty buffers were getting returned in certain cases.
Renamed ConjunctionX to ConnectiveX because "conjunction" is assumed "and" (disjunction "or"), where "connective" is the parent concept.
Removed PathIdentityStep as it was a hack that is now solved by Traversal.Admin.addTraverserRequirement().
Added Traversal.Admin.addTraverserRequirement() to allow a traversal strategy or source to add requirements (not only step determined anymore).
Added TraverserRequirement.ONE_BULK to state the traverser does not handle bulk.
Added GraphTraversalSource.withBulk(boolean) to enabled users to compute only using bulk=1.
Gremlin Server supports Netty native transport on linux.
Removed the need for GFunction (etc.) closure wrappers in Gremlin-Groovy as as Function can be used to convert closures accordingly.
Added SelectColumnStep (select(keys) and select(values)). Deprecated mapKeys() and mapValues().
Renamed gremlin.hadoop.graphInputRDD and gremlin.hadoop.graphOutputRDD to gremlin.spark.graphInputRDD and gremlin.spark.graphOutputRDD, respectively.
Fixed a bug in FoldStep around bulking. This could be a breaking change, but it is the correct semantics.
Previous group()-behavior steps are accessible via the deprecated groupV3d0()-steps.
GroupStep and GroupSideEffectStep now do lazy reductions to reduce memory footprint. Breaking change for group() semantics.
Added GroupStepHelper with various static methods and classes that are used by both GroupStep and GroupSideEffectStep.
Added BarrierStep interface with processAllStarts() method which process all starts up to yielding the barrier result.
Fixed a severe threading issue in TinkerGraphComputer.
The location of the jars in HDFS is now hadoop-gremlin-x.y.z-libs to ensure multiple TinkerPop versions don’t clash.
GiraphGraphComputer will only upload the jars to HDFS if it doesn’t already exist (to help speed up startup time).
GiraphGraphComputer.workers() is smart about using threads and machines to load balance TinkerPop workers across cluster.
GraphComputer.workers(int) allows the user to programmatically set the number of workers to spawn.
Added GryoSerializer as the new recommended Spark Serializer. Handles Graph and GryoMapper registries.
GryoPool now makes use of GryoPool.Builder for its construction.
Bumped to Apache Hadoop 2.7.1.
Bumped to Apache Giraph 1.1.0.
Bumped to Apache Spark 1.5.1.
Split Hadoop-Gremlin apart such there is now hadoop-gremlin, spark-gremlin, and giraph-gremlin (and respective GremlinPlugins).
Added LambdaCollectingBarrierStep which generalizes NoOpBarrierStep and allows for barrier(normSack)-type operations.
Fixed bugs in the Gremlin Server’s NIO protocol both on the server and driver side.
Added Path.popEquals(Pop,Object) to check for path equality based on Pop (useful for TraverserRequirement.LABELED_PATH).
Added Operator.assign to allow setting a direct value.
Operator is now a BinaryOperator<Object> with appropriate typecasting for respective number operators.
Simplified SackValueStep so it now supports both sack(function) and sack(function).by(). Deprecated sack(function,string) .
Added Parameters object to allow for the parameters of a step to be retrieved at runtime via a traversal.
Redesigned (though backwards compatible) AddEdgeStep, AddVertexStep, and AddPropertyStep (and respective GraphTraversal API).
Added GraphTraversalSource.inject() so users can spawn a traverser with non-graph objects.
GraphStep can now take a single argument Collection which is either elements or element ids (i.e. g.V([1,2,3]) is supported now).
Added LoopsStep to make the loop counter accessible within repeat(), until() and emit().
Gephi Plugin no longer requires manual insert of store steps to visualize a traversal.
Added a TinkerIoRegistry that registers a custom serializer for Gryo that will serialize an entire TinkerGraph instance.
Added configuration options to Gephi Plugin for setting the size of nodes visualized.
Replaced DedupBijectionStrategy with the more effective FilterRankingStrategy.
ComputerAwareSteps must not only handle step ids, but also step labels.
Renamed B_O_P_SE_SL_Traverser to B_LP_O_P_SE_SL_Traverser as it now supports TraverserRequirement.LABELED_PATH.
Added B_LP_O_S_SE_SL_Traverser in support of TraverserRequirement.LABELED_PATH.
Added TraverserRequirement.LABELED_PATH which only generates path data for steps that are labeled (greatly increases the likelihood of bulking).
Fixed a bug in Path usage that required an API update: Path.addLabel() is now Path.extend(Set<String>) and Traverser.addLabels(Set<String>).
Made Path iterable, so that it can be unfold()'ed and used by local steps like min(local), max(local), etc.
WhereTraversalStep and WherePredicateStep are now the only "special" Scoping steps after MatchStartStep in match().

Bugs

TINKERPOP-774 order / dedup issues
TINKERPOP-799 [Proposal] with()-modulator for stream level variable binding.
TINKERPOP-801 groupCount() fails for vertices (elements?) (using Spark)
TINKERPOP-811 AddPropertyStepTest fails "all of a sudden"
TINKERPOP-823 addV() broken for multi-value properties
TINKERPOP-843 Misspecified HADOOP_GREMLIN_LIBS generates NullPointerException
TINKERPOP-857 Add GraphComputer.config(key,value)
TINKERPOP-895 Use "as BinaryOperator" and remove GBinaryOperator
TINKERPOP-903 Fix empty buffer return upon buffer capacity exceeded
TINKERPOP-910 In session transaction opened from sessionless request
TINKERPOP-918 ComputerVerificationStrategy is too restrictive
TINKERPOP-926 Renamed TinkerGraph public statics to common pattern used for other statics.
TINKERPOP-948 AbstractGremlinProcessTest.checkMap not asserted in GroupTest
TINKERPOP-953 Artifact equality is not evaluating properly
TINKERPOP-955 HashMap$Node not serializable

Improvements

TINKERPOP-297 Ensure Consistent Behavior Over Deleted Elements (breaking)
TINKERPOP-333 Support VertexProperty in PartitionStrategy
TINKERPOP-391 More fluency in GraphComputer for parameterization.
TINKERPOP-616 Use Spark 1.3.0 in Hadoop-Gremlin.
TINKERPOP-624 Passing Detached/Referenced to Graph.vertices/edge()
TINKERPOP-680 Configurable Channelizer for Gremlin Driver
TINKERPOP-728 Improve Remote Graph Object Treatment in Console
TINKERPOP-756 Provide a strict parsing option for GraphMLReader
TINKERPOP-760 Make loop counter accessible within repeat()
TINKERPOP-762 Allow mid-traversal V() (and E())
TINKERPOP-765 Decompose AbstractTransaction for different transactional contexts (breaking)
TINKERPOP-767 Path should play well with "local" steps.
TINKERPOP-768 MatchStep in OLAP should be smart about current vertex.
TINKERPOP-769 Make the introduction of the TP3 docs story better.
TINKERPOP-772 TraverserRequirement.LABELED_PATH
TINKERPOP-796 Support merge binary operator for Gremlin sacks (breaking)
TINKERPOP-798 [Proposal] Rename mapKeys()/mapValues() to select(keys) and select(values).
TINKERPOP-802 Provide sack(object) so that the sack can be directly set.
TINKERPOP-803 A better solution to g.V(someCollection.toArray())
TINKERPOP-805 Enforce AutoCloseable Semantics on Transaction (breaking)
TINKERPOP-821 Improve testing around TraversalHelper around recursive methods
TINKERPOP-825 [Proposal] SetBulkStep (sideEffectStep)
TINKERPOP-826 OneToManyBarrierStrategy
TINKERPOP-827 Add a console session to the PageRank section of the docs.
TINKERPOP-829 TinkerGraphComputer should support the user specified thread/worker count.
TINKERPOP-835 Shade Jackson Dependencies (breaking)
TINKERPOP-836 Support Hadoop2 in place of Hadoop1
TINKERPOP-850 Reduce Graph.addVertex overload ambiguity (breaking)
TINKERPOP-851 GroupCountStep needs a by() for the count.
TINKERPOP-861 Solve "The Number Problem" for Operator (and follow on operators)
TINKERPOP-863 [Proposal] Turn off bulking — or is there something more general? (hope not).
TINKERPOP-866 GroupStep and Traversal-Based Reductions (breaking)
TINKERPOP-868 Allow Spark Gremlin Computer to Reuse Spark Contexts
TINKERPOP-874 Rename Gremlin-Spark properties using gremlin.spark prefix. (breaking)
TINKERPOP-876 Rename VendorOptimizationStrategy XXXOptimizationStrategy (breaking)
TINKERPOP-879 Remove deprecated promoteBindings from GremlinExecutor (breaking)
TINKERPOP-885 Change Transaction.onReadWrite() to be a ThreadLocal setting (breaking)
TINKERPOP-888 GraphTraversal.property overloads (breaking)
TINKERPOP-896 Simplify the {{withSack}} methods of {{GraphTraversalSource}}. (breaking)
TINKERPOP-897 Remove deprecated GSupplier, GFunction, GConsumer, etc. methods. (breaking)
TINKERPOP-898 Rename ConjuctionP and ConjuctionStep to ConnectiveP and ConnectiveStep (breaking)
TINKERPOP-899 Bump to the latest version of Neo4j.
TINKERPOP-900 Provide by(object) which compiles to by(constant(object))
TINKERPOP-901 Option for use of Netty epoll on Linux to reduce GC pressure
TINKERPOP-904 BulkLoaderVertexProgram optimizations
TINKERPOP-905 Harden time oriented tests in ResultQueueTest
TINKERPOP-907 getters for RepeatStep.untilTraversal and RepeatStep.emitTraversal
TINKERPOP-908 Use line breaks in documentation
TINKERPOP-909 Improve steps that handle numeric data
TINKERPOP-911 Allow setting Thread Specific Spark JobGroup/Custom Properties based on hadoop conf
TINKERPOP-913 Rename Gremlin Server arguments rebinding to alias
TINKERPOP-914 DriverRemoteAcceptor in Gremlin Console supports aliases
TINKERPOP-917 Add HadoopGraph.open(String)
TINKERPOP-922 Add a book for Developer Documentation
TINKERPOP-923 Add a book for Tutorials
TINKERPOP-925 Use persisted SparkContext to persist an RDD across Spark jobs.
TINKERPOP-931 Make it possible to extend the core OpProcessor implementations
TINKERPOP-933 Improve release process to get files named properly
TINKERPOP-935 Add missing "close" operation to the session opProcessor docs

TinkerPop 3.0.0 (A Gremlin Rāga in 7/16 Time)

TinkerPop 3.0.2 (Release Date: October 19, 2015)

Cleaned up ext/ directory when plugin installation fails for gremlin-server and gremlin-console.
Fixed issues in gremlin-server when configured for HTTP basic authentication.
Made BulkLoaderVertexProgram work for any persistent TP3-supporting graph (input and output).
TreeSideEffectStep now implements PathProcessor which fixed a ComputerVerificationStrategy issue.
Added a shell script that verifies source and binary distributions.
Fixed a bulk related bug in GroupStep when used on GraphComputer (OLAP).
Gremlin Server binary distribution now packages tinkergraph-gremlin and gremlin-groovy as plugins to be consistent with Gremlin Console’s packaging.
The RepeatStep clauses (until(),emit(),repeat()) can only be set at most one time in order to prevent user confusion.
Fixed a clone() bug in RepeatStep, TreeStep, GroupCountStep, GroupStep, and TraversalRing.
Fixed a thread context bug in TinkerGraphComputer.
Fixed issues with the gremlin-driver related to hanging connections in certain conditions.
TinkerGraph now has an option for persistence where the data is saved on close() and, if present, loaded on open().
Added an overload for GremlinExecutor.eval() that takes a Lifecycle object to override some default settings from GremlinExecutor.Builder.
Improved session closing for transactional graphs during shutdown of Gremlin Server.
Fixed id parameter used in tests for GroovyStoreTest and GroovyRepeatTest to not be treated as an embedded string.
GraphStep will convert any Vertex or Edge ids to their id Object prior to submission to GraphComputer (OLAP).

Bugs

TINKERPOP-814 ConnectionPool can fill with dead Connections
TINKERPOP-816 Gryo deserialization of error response with null message causes NPE and protocol desync
TINKERPOP-817 Gryo serialization of large responses fails and causes protocol desync
TINKERPOP-840 TreeTest Is not being ignored via ComputerVerificationStrategy
TINKERPOP-849 gremlin-server doesn’t close sessions on 'close' opcode
TINKERPOP-855 sasl authentication type error due to Json format
TINKERPOP-865 Errors with HTTP REST basic auth
TINKERPOP-867 TinkerGraphProvider does not initialize temp dir
TINKERPOP-870 Rebound client requires a connection to occur on the underlying client.
TINKERPOP-877 Driver hangs if SSL enabled on server but not on client

Improvements

TINKERPOP-828 TinkerGraph can supportPersistence(), should we allow it.
TINKERPOP-830 process-docs.sh introduces extra white space dependent on console width
TINKERPOP-839 Docs should have a ${version.number} under the logo.
TINKERPOP-852 A shell script that validates the distribution artifacts at release time
TINKERPOP-853 TinkerPop Logo in JavaDoc index.html
TINKERPOP-858 Cleanup after failed :install

TinkerPop 3.0.1 (Release Date: September 2, 2015)

Compare now uses BigDecimal internally to ensure that precision is not lost on standard number comparisons.
Renamed ComputerVerificationStrategy to VerificationStrategy so all the verification strategies can use it.
Added StandardVerificationStrategy that throws exceptions for illegal traversal patterns on the standard engine (which extends to GraphComputer).
Added GraphFeatures.supportsConcurrentAccess() to allows Graph implementations to signify if multiple instances can access the same data.
Clarified semantics of Transaction.close() in unit tests - now refers only to closing the current transaction in the current thread.
Neo4jGraph no longer uses OptOut on TransactionTest.shouldRollbackOnCloseWhenConfigured (formerly shouldRollbackOnShutdownWhenConfigured)
Gremlin Server initialization scripts can now return a Map of values that will become global bindings for the server.
Introduced the --dryRun option to the document generation process which ignores actual script execution in the Gremlin Console.
Fixed bug in EventStrategy around property changed events when calling property without cardinality or meta-property values.
Improved support for the Accept header for REST-based requests in Gremlin Server.
GraphFactory now allows specification of the class to use to instantiate the Graph through the GraphFactoryClass annotation.
Added wrapAdjacencyList and unwrapAdjacencyList options to GraphSONWriter and GraphSONReader respectively, thus allowing valid JSON to be written/read if the user desires.
Added Gremlin Server/Driver authentication support via SASL.
Added Basic HTTP authentication support for REST in Gremlin Server.
Added Gremlin Server plugin to help with "credential graph" management (used in conjunction with authentication features of Gremlin Server).
Added "secure" Gremlin Server/Driver example configuration files.
Adjusted configuration for javadoc generation to eliminate error messages.
Removed "reserved" graph concept names from tests (e.g. "label", "edge", "value") to support the convention of avoiding these strings for property names.
Introduced GraphProvider.Descriptor which annotates a GraphProvider implementation to describe what GraphComputer implementation will be used.
Modified OptOut to include a computers attribute which allows the Graph to opt-out of computer-based tests for specific computation engines.
Added a SandboxExtension that can be plugged into TypeCheckedCustomizerProvider and CompileStaticCustomizerProvider to control classes and methods that can be used in the GremlinGroovyScriptEngine.
Added a number of new ImportCustomizerProvider implementations such as, TimedInterruptCustomizerProvider, TypeCheckedCustomizerProvider and others.
Refactored GremlinGroovyScriptEngine to make more general use of ImportCustomizerProvider implementations.
Removed SecurityCustomizerProvider class and the "sandbox" configuration on the ScriptEngines class - this was an experimental feature and not meant for public use.
Removed dependency on groovy-sandbox from the gremlin-groovy module.

Bugs

TINKERPOP-770 Exception while AddPropertyStep tries to detach vertex property
TINKERPOP-780 Use of fold() in repeat()
TINKERPOP-782 map(Traversal) should declare requirements of child
TINKERPOP-785 Gremlin Server Not Properly Reporting Port Conflict
TINKERPOP-792 select at start of match traversal on Map can fail
TINKERPOP-794 IncidentToAdjecentStrategy malfunction
TINKERPOP-804 Failed installing neo4j-gremlin extension on Windows 7
TINKERPOP-822 Neo4j GraphStep with element arguments ignores has (breaking)

Improvements

TINKERPOP-576 Gremlin Server Authentication
TINKERPOP-582 Remove Groovy Sandbox Dependency
TINKERPOP-610 General graph concept names in test schema
TINKERPOP-656 IoRegistry Chaining
TINKERPOP-690 Be able to OPT_OUT for Standard, but not Computer (breaking)
TINKERPOP-699 GraphSON writeGraph not producing valid json object
TINKERPOP-750 Compare should not have special case for Number
TINKERPOP-752 Make Gremlin Server Better Respect ACCEPT
TINKERPOP-764 Unify semantics of Transaction.close() in tests and documentation (breaking)
TINKERPOP-771 IoRegistry Instantiation With GryoPool
TINKERPOP-778 Support GraphFactory location via annotation.
TINKERPOP-791 Document rules for committers
TINKERPOP-797 order() seems to only like List? (breaking)
TINKERPOP-808 TraversalComparator.comparator needs a getter

TinkerPop 3.0.0 (Release Date: July 9, 2015)

Modified the GremlinExecutor to catch Throwable as opposed to Exception so as to properly handle Error based exceptions.
Modified the GremlinGroovyScriptEngine compilation configuration to prevent inappropriate script evaluation timeouts on standalone functions.
Added a custom configuration for "timed interrupt" in the ScriptEngines instantiation of the GremlinGroovyScriptEngine.
Added mapKeys() (MapKeyStep) and mapValues() (MapValueStep) to get the keys and values of a map, respectively.
select() no longer supports empty arguments. The user must specify the keys they are selecting.
MatchStep and match() no longer have a "start label" parameter — it is computed if the incoming traverser does not have requisite labels.
Turned transactional testing back on in Gremlin Server using Neo4j.
Renamed Transaction.create() to Transaction.createThreadedTx().
Added TraversalParent.removeGlobalChild() and TraversalParent.removeLocalChild().
Added a clear option to the Gephi Plugin to empty the Gephi workspace.
Refactored ResultSet and related classes to stop polling for results.
AbstractStep now guarantees that bulk-less and null-valued traversers are never propagated.
Added dedup(string…) which allows for the deduplication of a stream based on unique scope values.
Fixed multiple bugs in the Gephi Plugin related to refactoring of traversal side-effects.
Split WhereStep into WherePredicateStep and WhereTraversalStep to simplify internals.
Prevent the driver from attempting to reconnect on a dead host if the Cluster.close() method has been called.
Renamed the "deactivate" option on :plugin command to "unuse" to be symmetric with the "use" option.
Added Traversal.toStream() to turn the Traversal<S,E> into a Stream<E>.
Added Scoping.Variable enum of START and END which allows the Scoping step to specify where its bindings are.
ComputerVerificationStrategy is smart about not allowing WhereXXXStep with a start-variable to run in OLAP as it selects the value from the path.
Rewrote MatchStep where it now works on GraphComputer, solves more patterns, provides plugable execution plans, supports nested AND/OR, not()-patterns, etc.
Renamed Graphs in Gremlin Server to GraphManager.
Fixed bug in Gremlin Driver where client-side serialization errors would not bubble up properly.
Fixed problem in Gremlin Server to ensure that a final SUCCESS or NO_CONTENT message assured that the transaction was successful in sessionless requests.
Arrow keys for cycling through command history now work in Gremlin Console when being used on Windows.
Added NotStep and not(traversal) for not’ing a traversal (integrates like ConjunctionStep).
Removed TraversalP. Traversals and P-predicates are completely separate concepts.
has(key,traversal) is now an alias for filter(__.values(key).traversal) using TraversalFilterStep.
Simplified SubgraphStrategy by using TraversalFilterStep instead of the more complex WhereStep.
Added TraversalMapStep, TraversalFlatMapStep, TraversalFilterStep, and TraversalSideEffectStep which all leverage an internal traversal.
Added Path.get(pop,label) as default helpers in Path.
Added Pop.first, Pop.last, and Pop.all as enums for getting single items from a collection or a list of said items.
Changed GremlinServer.start() to return a CompletableFuture that contains the constructed ServerGremlinExecutor.
Restructured IoTest breaking it up into smaller and more logically grouped test cases.
Gremlin Server Settings now has sensible defaults thus allowing the server to be started with no additional configuration.
Fixed garbled characters in Gremlin Console that notably showed up in :help
Replaced dependency on groovy-all with individual Groovy dependencies as needed.
Bumped org.gperfutils:gbench to the 0.4.3 and a version explicitly compatible with Groovy 2.4.x.
Renamed KeyStep to PropertyKeyStep to be consistent with PropertyValueStep.
Added Gremlin-Lib-Paths to modify paths in plugin lib directory.
Modified the capabilities of Gremlin-Plugin-Paths to delete paths that have no value on the right-hand-side of the equals sign.
The REST API in Gremlin Server now requires parameters to be defined with a "bindings." prefix.
Modified the REST API in Gremlin Server to accept rebindings.
Added rebindings optional argument to sessionless requests to allow global bindings to be rebound as needed.
Added LazyBarrierStrategy which "stalls" a traversal of a particular form in order to gain a bulking optimization.
CollectingBarrierStep supports maxBarrierSize for "lazy barrier," memory conservation.
Scoping now has getScopeKeys() to get the keys desired by the scoping step.
Refactored SSL support in the Gremlin Server/Driver.
Factored out ServerGremlinExecutor which contains the core elements of server-side script execution in Gremlin Server.
Bumped to netty 4.0.28.Final.
Refactored the Mutating interface and introduce CallbackRegistry interface around EventStrategy.
Changed onReadWrite and onClose of AbstractTransaction to be synchronized.
Added LabelP to support index lookups and has() filtering on Neo4jGraph multi-label vertices.
AddEdgeStep is now a Scoping step.
Added a fully defined set of Graph.Feature implementations to EmptyGraph.
Dropped dependency on org.json:json - used existing Jackson dependency.
Added back neo4j-gremlin as the licensing of the Neo4j API is now Apache2.
Added willAllowId method to features related to vertices, edges and vertex properties to test if an identifier can be use when supportsUserSuppliedIds is true.
Fixed a bug in GraphTraversal.choose(predicate,trueTraversal,falseTraversal).
Removed MapTraversal, MapTraverserTraversal, FilterTraversal, and FilterTraverserTraversal as these are simply .map(function) and .filter(predicate).
Include hadoop-gremlin Hadoop configuration sample files in Gremlin Console distribution.
Iteration of results in Gremlin Server occur in the same thread as evaluation and prior to transaction close.
TinkerGraphComputer now supports every ResultGraph/Persist combination.
GraphComputerTest extended with validation of the semantics of all ResultGraph/Persist combinations.
GiraphGraphComputer no longer requires an extra iteration and MapReduce job to derive the full Memory result.
SparkGraphComputer now supports InputRDD and OutputRDD to allow vendors/users to use a SparkContext to read/write the graph adjacency list.
Added Scoping.getScopeValue() method so all "selecting" steps use the same pattern for map, path, and sideEffect data retrieval.

TinkerPop 3.0.0.M9 (Release Date: May 26, 2015)

Removed GraphComputer.isolation() as all implementations use standard BSP.
Added a Gremlin Server LifeCycleHook to ensure that certain scripts execute once at startup and once at shutdown.
has(key) and hasNot(key) are now aliases for where(values(key)) and where(not(values(key))), respectively.
TinkerGraph classes are now final to restrict user and vendor extension.
Added TraversalStrategy.VendorOptimization to ensure that all TinkerPop optimizations execute first on the known TinkerPop steps.
Added TailGlobalStep and TailLocalStep (tail()) which gets objects from the end of the traversal stream.
AndStep and OrStep are now simply markers where WhereStep(a.and(b).and(c)…and(z)) is the compilation.
Moved Compare, Contains, Order, Operator, and P to process/traversal from structure/ as they are process-based objects.
HasContainer now uses P predicate as helper methods and tests are more thorough on P.
Changed Gremlin Server integration/performance tests to be runnable from within the gremlin-server directory or from the project root.
Moved the string methods of TraversalHelper to StringFactory.
Renamed JSON-related serializers for Gremlin Server to be more consistent with GraphSON naming.
Removed HasTraversalStep in favor of new P.traversal model with HasStep.
Fixed bug in WsGremlinTextRequestDecoder where custom serializers from graphs were not being used.
Added AndP which allows for the and()-ing of P predicates.
Order.opposite() is now reversed() as that is a Comparator interface method with the same semantics.
Compare/Contains/P.opposite() are now negate() as that is a BiPredicate interface method with the same semantics.
has(traversal) is replaced by where(traversal) and has(key,traversal). HasXXX is always with respects to an element property.
Added TraversalScriptHelper with static methods for dynamically creating a Traversal from a JSR 223 ScriptEngine.
Changed SubgraphStrategy to take Traversal rather than Predicate for filtering.
Improved SubgraphStrategy to only modify the Traversal if filtering was required.
Improved logging of errors in the HttpGremlinEndpointHandler to include a stracktrace if one was present.
Moved AbstractGremlinSuite.GraphProviderClass to org.apache.tinkerpop.gremlin.GraphProviderClass.
Simplified the Gremlin-Groovy test suite where there is now no distinction between STANDARD and COMPUTER tests.
VertexProgram and MapReduce now add a Graph parameter to loadState(Graph, Configuration).
Added ScopingStrategy which auto-scopes select() and where() so the language looks clean.
Added Scoping as a marker interface to state that a step desires a particular Scope.
SelectStep, SelectOneStep, and WhereStep support both Scope.local and Scope.global for Map<String,Object> or Path analysis, respectively.
Fixed a bug in the TraversalStrategies sort algorithm.
Removed numerous unused static utility methods in TraversalHelper.
TinkerGraph process suite tests are now running with and without strategies in place.
Added IncidentToAdjacentStrategy which rewrites outE().inV(), inE().outV() and bothE().otherV() to out(), in() and both() respectively.
Renamed ComparatorHolderRemovalStrategy to OrderGlobalRemovalStrategy as it now only applies to OrderGlobalStep.
Anonymous traversal no longer have EmptyGraph as their graph, but instead use Optional<Graph>.isPresent() == false.
Added Traversal.Admin.setGraph(Graph) as strategies that need reference to the graph, need it across all nested traversals.
AbstractLambdaTraversal is now smart about TraversalParent and TraversalStrategies.
Fixed bug in GraphML reader that was not allowing <edge> elements to come before <node> elements as allowable by the GraphML specification.
Added VertexFeature.getCardinality.
Added AdjacentToIncidentStrategy which rewrites out().count() to outE().count() (and similar such patterns).
GryoPool now takes a Configuration object which allows setting the size of the pool and the IoRegistry instance.
Added PersistResultGraphAware interface which is used by OutputFormats to specify persistence possibilities for a Hadoop GraphComputer.
ElementIdStrategy now allows the identifier property to be set directly (and not only by specifying T.id).
Added sample configuration files for registering a TraversalStrategy in Gremlin Server.
Added response status code for NO_CONTENT to represent output for a successful script execution without a result (e.g. an empty Iterator).
Removed the notion of a "terminator" message from the Gremlin Server protocol - new response status code for PARTIAL_CONTENT.
Path and Step labels are ordered by the order in which the respective addLabel() calls were made.
A Step now has a Set<String> of labels. Updated as() to take a var args of labels.
Dropped BatchGraph from the code base - it will be replaced by bulk loader functionality over OLAP.
TraversalSideEffects now implements Optional semantics. Less code as Java8 provides the helper methods.
TraversalScriptSupplier now takes an Object var args for setting ScriptEngine bindings if needed.
Compare is now more lenient on Number-types.
Removed Compare.inside and Compare.outside as they are not primitive comparators and should be composed from primitives.
Introduced P (predicate) for cleaner looking is(), has(), and where() calls — e.g. has('age',eq(32)).
GraphTraversalSource is now the location for withXXX() operations. No longer do they exist at GraphTraversal.
All Traverser objects now extend from AbstractTraverser or a child that ultimately extends from AbstractTraverser.
OLTP select() now returns a list for traversals with duplicate labels (as this was a unintended side-effect of SparsePath).
Removed the SparsePath optimization as it led to numerous corner-case inconsistencies.
VertexWritable serializes and deserializes the StarGraph object — no more intermediate DetachedXXX objects.
Gremlin Server better supports the settings for the high and low watermark that will slow writes to clients that are lagging.
Added GraphReader.readObject() and GraphWriter.writeObject abstractions for those implementations that can support them.
Altered GraphWriter.writeVertices() method to take an Iterator of vertices rather than a Traversal.
GraphSON format for output from GraphWriter.writeVertex, GraphWriter.writeVertices, and GraphWriter.writeGraph have all changed now that they use StarGraph serialization.
Gryo format for output from GraphWriter.writeVertex, GraphWriter.writeVertices, and GraphWriter.writeGraph have all changed now that they use StarGraph serialization.
Added read and write methods to GraphReader and GraphWriter for Property and VertexProperty.
Reduced object creation in GraphSON during serialization.
Moved T tokens to the structure/ package as its more general than process/.
Attachable.attach() now takes a Method to determine whether to attach via GET, CREATE, or GET_OR_CREATE.
Decreased size of Gremlin Server RequestMessage and ResponseMessage serialization payloads and reduced object creation.
Graph.empty() no longer required with the introduction of ShellGraph which is a placeholder for a graph class and computer.
VertexProperty.Cardinality default is now vendor chosen. If the vendor has not preference, they should use Cardinality.single.
Messenger.receiveMessages() no longer takes a MessageScope and thus, consistent behavior between message-passing and message-pulling systems.
Changed the gremlin.tests environment variable for test filtering to the more standard convention of GREMLIN_TESTS and made it work for all test suites.
Removed back()-step as select()-step provides the same behavior with more intelligent optimizations and by()-modulation.
Removed Graph.Helper method annotation and related infrastructure in tests.
Modified header of Gryo to be 16 bytes instead of 32 (and removed the version stamp).
Removed the concept of handling version in Gryo via the builder as it wasn’t really accomplishing the capability of ensuring backward compatibility.
Moved Exceptions.propertyRemovalNotSupported from Element to Property for consistency.
Provided a method for Gremlin Server to bind TraversalSource objects for use in scripts.
Modified the reference implementation for dealing with "custom" identifier serialization in GraphSON - See IoTest.CustomId for the example.
Modified g.vertices/edges and related methods and tests to support non-type specific querying (e.g. g.V(1) and g.V(1L) should both return the same result now).
TinkerGraph supports an IdManager which helps enforce identifier types and improve flexibility in terms of how it will respond to queries around identifiers.
DetachedXXX now uses the standard structure/ exceptions for unsupported operations.
Added private constructors to all Exceptions inner classes in the respective structure/ interfaces.
Re-introduced ReferenceXXX to ensure a smaller data footprint in OLAP situation (DetachedXXX uses too much data).
Attachable now has a set of static exception messages in an Exceptions inner class.
Added StarGraph which is a heap efficient representation of a vertex and its incident edges (useful for GraphComputer implementations).
TraverserSet uses a FastNoSuchElementException on remove() for increased performance.
Add Profiling interface to enable vendors to receive a Step’s MutableMetrics.

TinkerPop 3.0.0.M8 (Release Date: April 6, 2015)

Removed Neo4j-Gremlin from this distribution due to GPL licensing. Working with Neo4j team to reintroduce by M9.
Altered structure of plugin directories for Gremlin Server and Gremlin Console to allow for the full lib directory with all dependencies and the lighter plugin directory which contains filtered dependencies given the path.
Improved OptOut to allow for exclusion of a group of tests by specifying a base test class.
GraphComputerTest is now Java8 specific and much easier to extend with new test cases.
Merged the gremlin-algorithm module into gremlin-test.
Removed LambdaVertexProgram and LambdaMapReduce as it will be one less thing to maintain.
Gremlin Console accepts a max-iteration configuration via the standard :set command to limit result iteration.
Vertex.property() default behavior is now Cardinality.single.
Added ElementIdStrategy as a TraversalStrategy.
Introduce AbstractTransaction to simplify implementation of standard transactional features for vendors.
Added EventStrategy to generate Graph modification events to listeners.
Added test to enforce return of an empty Property on VertexProperty.property(k) if no meta properties exist.
Added methods to registered transaction completion listeners on Transaction and provided a default implementation.
Fixed bug in Neo4j where return of an empty meta property was returning a NullPointerException.
Refactored step API — the TinkerPop3 steps are the foundation for any domain specific language (including graph).
MapReduce now has workerStart(Stage) and workerEnd(Stage) methods with analagous semantics to VertexProgram.
Hadoop-Gremlin ObjectWritable now leverages Kryo for data serialization.
GiraphGraphComputer supports arbitrary objects as the vertex id — previously, only long ids were supported.
Added VertexProgramPool to support thread safe pooling of vertex programs for graph computers that provide threaded workers.
Added GryoPool to support thread safe pooling of Gryo readers and writers.
Added TraversalSource which contextualizes a traversal to a graph, DSL, execution engine, and runtime strategies.
Added AddVertexStep (addV), AddPropertyStep (property), and changed AddEdgeStep to a map-step instead of a sideEffect-step.
Added compile method to GremlinExecutor and related classes.
Fixed bug in Gremlin Server that was generating extra response messages on script evaluation errors.
Changed the Memory API to not return the mutated value on or, and, incr as it is too difficult to implement faithfully in a distributed system.
Added SparkGraphComputer to Hadoop-Gremlin which uses Apache Spark as the underlying computing engine.
Renamed "Gremlin Kryo" to "Gryo".
Refactored TinkerWorkerPool to use ExecutorService so as to reuse threads when executing graph computer functions.
Removed Reducing.Reducer and ReducingStrategy. Previous Reducing classes are now MapReducer classes.
Refactored the "process" test suite to allow for better test configuration with respect to different TraversalEngine implementations.
Added hasNot(traversal) which is a faster way of doing has(traversal.count().is(0L)).
TraversalStrategy.apply(traversal) is the new method signature as the TraversalEngine can be retrieved from the Traversal.
TraversalEngine is now an interface and provided to the traversal by the graph. Graph methods added to set the desired traversal engine to use.
Added count(local), sum(local), max(local), min(local), mean(local), dedup(local), sample(local) and range(local) for operating on the local object (e.g. collection, map, etc.).
TraversalComparator exists which allows for order().by(outE().count(),decr).
Added Apache Rat plugin to detect the proper inclusion of license headers in files.
A Traversal now respects thread interruption during iteration, throwing a TraversalInterruptionException if it encounters interruption on the current thread.
Apache refactoring: com.tinkerpop → org.apache.tinkerpop.
Traversal is now Serializable and with most queries no longer needing lambdas, Gremlin-Java works over the wire.
Added VertexProperty.Cardinality with list, set, and single. No more Vertex.singleProperty() method.
Added RangeByIsCountStrategy that adds a RangeStep in front of .count().is(<predicate>, <value>) to minimize the amount of fetched elements.
Added CoalesceStep / coalesce() that emits the first traversal which emits at least one element.
Added more syntactic sugar tricks to the Gremlin sugar plugin — &, |, select from, gt, etc.
Traversal.Admin is consistent internal to steps, traversals, strategies, etc. For the user, Traversal is all they see.
TraversalHolder is now called TraversalParent with the child/parent terminology used throughout.
Added GroovyEnvironmentPerformanceSuite.
Provided more robust shutdown capabilities for the thread pools used in GremlinExecutor.
A massive process/ package reorganization — class names are still the same, just in new packages.
Bumped neo4j-graph to Neo4j 2.1.6.
Bumped to Groovy 2.4.1.
Added a new "performance" test suite for Gremlin Process.
Steps now only operate with traversals — no more lambdas. Lambda→ Traversal conversion utilities added.
SideEffectStep always requires a Consumer. Steps that were consumer-less simply extends AbstractStep.
Simplified the Neo4jGraph implementation by now allowing cypher() mid-traversal. Only available via g.cypher().
Moved clock() out of the Utility plugin. It is now available to both Groovy and Java.
Changed the OptOut annotation to allow for ignoring an entire test case using a wildcard.
Added AndStep and OrStep filters to support arbitrary conjunction of traversals.
__ is now a class with static GraphTraversal methods and thus repeat(out()) is possible.
Added IsStep / .is() that supports filtering scalar values.
Neo4jGraph and TinkerGraph no longer create new Feature instances on each feature check.
Added Compare.inside and Compare.outside for testing ranges. Removed between() as now its has('age',inside,[10,30]).
GraphTraversal.has() no longer requires the element type to be cast in the traversal definition.
Fixed a ConcurrentModificationException bug in TinkerGraph that occurred when doing full vertex/edge scans and removing elements along the way.
Added Scope.local and Scope.global in support of OrderLocalStep and OrderGlobalStep via order(scope).
Added Order.keyIncr, Order.keyDecr, Order.valueIncr, and Order.valueDecr in support of Map sorting.
Added Order.shuffle and removed shuffle() in favor of order().by(shuffle).
Changed Order implements Comparator<Comparable> to Order implements Comparator<Object> as its now generalized to multiple types of objects.
The maxContentLength setting in Gremlin Server is now respected by the HTTP/REST Gremlin endpoint.
Fixed resource leak in the HTTP/REST Gremlin endpoint of Gremlin Server.
Refactored Gremlin Server start and stop functions to return CompletableFuture.
HTTP REST error response JSON objects from Gremlin Server should no longer have issues with control characters, line feeds, etc.
Added MeanStep, mean(), and MeanNumber for calculating number averages in a traversal.
Greatly simplified all the traversal MapReduce implementations due to the introduction of VertexTraversalSideEffects.
Added VertexTraversalSideEffects as a cheap, static way to get a sideEffect-view of a vertex in OLAP.
Added TraversalHelper.isLocalStarGraph() which determines if a traversal is contained within the local star graph.
Added TraversalVerificationStrategy to verify if the traversal can be executed on respective engine.
Refactored GraphTraversal.cap() to GraphTraversal.cap(String…) to support multi-sideEffect grabs.
Added GraphSON serialization for Path.
Added Traversal.Admin.getTraverserRequirements() and removed TraversalHelper.getTraverserRequirements(Traversal).
Traversal.equals() is no longer computed by determining if the objects returned are equal.
Altered messaging in Gremlin Console when using a remote that is not yet activated.
Fixed potential for deadlock in Gremlin Driver when waiting for results from the server.
Added the useMapperFromGraph serializer option to the Gremlin Server configuration file to allow auto-registration of serialization classes.
Refactored Netty pipeline structure to not have a second "Gremlin" executor group and instead used a standard ExecutorService.
Refactored the GremlinExecutor to take an optional transformation function so as to allow manipulation of results from eval in the same thread of execution.
Fixed issue with the HttpGremlinEndpointHandler where requests were getting blocked when keep-alive was on.
Added MinStep and MaxStep with respective min() and max().
CountStep and SumStep now extend ReducingBarrierStep and no longer are sideEffect steps.
SideEffectCapStep now extends SupplyingBarrier and is much simpler than before.
Added SupplyingBarrier which simply drains the traversal and emits the value of a provided supplier.
Added TraversalLambda which implements function, predicate, and consumer over a provided traversal.
Any non-core Step that takes a function or predicate can now take a traversal which maps to traversal.next() (function) and traversal.hasNext() (predicate).
CollectingBarrierStep is no longer abstract and added GraphTraversal.barrier() which is analogous to fold().unfold(), though cheaper.
Added TraversalOptionHolder for branching steps to index works with corresponding GraphTraversal.option().
BranchStep is now a proper generalization of UnionStep and ChooseStep.
SubgraphStep has changed in support of in-traversal filtering and removing the need for path-based traversers.
Added HasTraversalStep which takes an anonymous traversal to determine whether or not to filter the current object.
Added Traversal.Admin.getStartStep() and Traversal.Admin.getEndStep(). Removed TraversalHelper.getStart() and TraversalHelper.getEnd().
Refactored profile() to use injected steps. ProfileStep can now be used without any special JVM command line parameters.
Added ReducingBarrierStep which acts like CollectingBarrierStep but operates on a seed with a bi-function.
Added a preprocessor for AsciiDocs. Documentation code examples are executed and the results are dynamically inserted into the doc file.
LocalStep traversal is treated as a branch, not an isolated traversal. Moreover, moved LocalStep to branch/.
Traversal strategies are now applied when the TraversalVertexProgram state is loaded, not when submitted. Less error prone as it guarantees strategy application.
Reworked TraversalHolder where there are "local traversals" and "global traversals". Local traversals are not subject to OLAP message passing.
Fixed a bug in DedupStep that made itself apparent in DedupOptimizerStrategy.
Added RepeatStep.RepeatEndStep in order to reduce the complexity of the code on OLAP when the predicates are not at the start of RepeatStep.

TinkerPop 3.0.0.M7 (Release Date: January 19, 2015)

Added SideEffectRegistrar interface and SideEffectRegistrationStrategy for allowing steps to register sideEffects at strategy application time.
Renamed Traverser.Admin.setFuture() and Traverser.Admin.getFuture() to setStepId() and getStepId(), respectively.
Added TraversalMatrix for random access to steps in a traversal by their step id. Used by TraversalVertexProgram.
Added unique identifies to Step that are not the user provided labels. Step.getLabel() now returns an Optional<String>.
Removed UnionLinearStrategy, ChooseLinearStrategy, and RepeatLinearStrategy as nested traversals are now natively supported in OLAP.
Fixed Neo4jGraph around manual transaction behavior on commit and rollback such that they would throw exceptions if a transaction was not open.
Redesigned the hidden step labeling mechanism so its consistent across a cluster, easier for rewrite strategies, and will enable nested OLAP traversals.
Traverser.incrLoops() now takes a string step label to enable nested looping constructs (i.e. loop stacks).
Added Traversal.tryNext() which returns an Optional, where the provided default method should be sufficient for all vendors.
Removed PathConsumer in favor of TraverserRequirement.PATH-model via Step.getRequirements().
Step.getRequirements() returns a Set<TraverserRequirement> which is what is required of the Traverser by the Step.
Traverser now extends Cloneable and Traverser.clone() is used to good effect in Traverser.split().
Added AbstractTraverser for which all traversers extend.
Moved Traversal.SideEffects to TraversalSideEffects as sideEffects are not necessarily tied to the traversal.
Removed Graph.of() for generating anonymous graph traversals — replaced by __-model.
Removed Graph being stored in Traversal.SideEffects. Too dangerous when moving between OLTP and OLAP and its limited uses were worked around easily.
No need for DefaultXXXGraphTraversal unless the vendor is extending with new methods (e.g. DefaultNeo4jGraphTraversal).
Reworked TraversalStrategies such that the are "emanating object class"-dependant, not Traversal dependent.
Moved Traverser.sideEffects() to Traverser.asAdmin().getSideEffects(). Users should use Traverser.sideEffects(key) and Traverser.sideEffects(key,value).
Added SerializationTest to the StructureStandardSuite in gremlin-test which validates serialization at a lower level than IoTest.
Removed IntervalStep and renamed interval() to between() which is simply an alias to a has().has() chain.
Added static interface which allows for .out().out()-style construction of anonymous traversals (instead of g.of()).
The only GraphTraversal steps that operate on Traverser are the base lambdas and repeat() (i.e. emit() and until()).
Removed dependency on the reflections library in gremlin-test which removed the default implementation of GraphProvider.getImplementations() - vendors now need to implement this method themselves.
Relaxed the <S> typing requirement for anonymous traversals when applied to choose(), repeat(), union(), etc.
Removed LoopStep and UntilStep in favor of the new RepeatStep model of looping in Gremlin3.
BranchStep is now exposed in GraphTraversal via branch(function).
UnionStep now implements TraversalHolder.
Added RepeatStep as the new looping construct supporting do/while, while/do, and emit semantics.
Moved Traversal.sideEffects() to Traversal.Admin.getSideEffects() as cap() should be used to access the sideEffect data of a traversal.
Renamed vendor XXXTraversal to XXXGraphTraversal (interface) and XXXGraphTraversal to DefaultXXXGraphTraversal (implementation class).
Modified packaging for console plugins to be more consistent by moving them to the com.tinkerpop.gremlin.console.groovy.plugin namespace.
Removed all TinkerPop specific dependencies to Guava to avoid user version conflicts.
Added support for -e (script file execution) and -v (version display) options on gremlin.sh.
GraphSON supports the assignment of multiple custom serialization modules.
Traverser.get(stepLabel/sideEffectKey) no longer exists. There now exists: Traverser.path(stepLabel) and Traverser.sideEffects(sideEffectKey).
SimpleTraverser now supports "path" but in a very loose, global cache way. Added SparsePath as a Map-backed Path implementation.
Provided Neo4j multi-label support in Neo4j-Gremlin. Added three Neo4jVertex-specific methods: addLabel(), removeLabel(), labels().
Bumped to Groovy 2.3.9.
Added Graph.Io interface which allows for simplified helper methods for end users and a way for vendors to override GraphReader and GraphWriter initial construction when custom serializers are needed.
Removed methods from GraphProvider related to customizing serializers in IoTest from the test suite as the new Graph.Io interface now serves that purpose.
Added Neo4jGraph.checkElementsInTransaction(boolean) which will (or not) verify whether elements retrieved via Neo4j global graph operations are transactionally consistent.
Added ScriptInputFormat and ScriptOutputFormat to Hadoop-Gremlin for reading and writing a file according to an arbitrary parsing script.
Added TimeLimitStep.getTimedOut() to determine if the step timed out or there were no more objects to process.
Graph.System is now Graph.Hidden with "hidden" being the vendor namespace and the key prefix being ~.
Much better toString() handling in Step and Traversal.
ComparatorHolder<V> interface returns a List<Comparator<V>> instead of a Comparator<V>[].
T now implements Function<Element,Object>.
Added ElementValueComparator and ElementFunctionComparator in support of vendor introspection on ComparatorHolder-steps.
Renamed Comparing marker interface to ComparatorHolder.
FunctionHolder interface provides vendor introspection via ElementValueFunction.
Removed OrderByStep as it is now just order() with a by()-based comparator.
Added SampleStep (sample()) to allow for sampling the set of previous objects. Useful for doing random walks with local().
Renamed random() to coin() to better express that the filter is a random coin toss.
Added by()-projection to modulate the meaning of post-processing steps like aggregate(), groupCount(), path(), order(), etc.
Removed the Strategy interface and gave StrategyGraph direct access to the GraphStrategy.
Added Graph.strategy() to help instantiate StrategyGraph instances.
Modified the signature of all GraphStrategy methods to include an parameter that contains a reference to the "composing strategy".
PartitionStrategy hides the specified partition key from view when iterating properties, keys, etc.
Change construction of GraphStrategy implementations to be consistent with singleton instances and builder pattern.
Added Graph.Helper annotation to "protected" certain default interface methods from implementation by vendors.
Transaction retry functions now work with "manual" transactions.
Improved error messaging when importing "legacy" GraphSON that was not generated with "extended" properties.
Renamed "iterator" related methods in the GraphStrategy interface to be consistent with the method names they represent.
PropertyMapStep (valueMap()) now takes a boolean to state if the tokens of the element are desired along with its properties.
HadoopGraph now connected to the StructureProcessSuite.
HadoopGraph no longer supports Graph.Variables as they were in-memory. A persistence mechanism can be introduced in the future.
Hidden properties removed in favor of using GraphStrategy for such features.
Edge.iterators().vertexIterator(BOTH) now guarantees OUT then IN vertex iterator order.
Graph.v(Object) and Graph.e(Object) no longer exist. Instead, use Graph.V(Object… ids) and Graph.E(Object… ids).
Added Graph.Iterators to allow access to vertex and edge iterators based on element ids and bypassing GraphTraversal.
Renamed GraphStrategy implementations to be less verbose - removed the word "Graph" from their names (e.g. IdGraphStrategy simply changed to IdStrategy).
Removed Step.NO_OBJECT as the problem is solves can be solved with proper use of flatMap and EmptyTraverser.
Path is now part of GraphSerializer and thus, not specific to a particular implementation of Path.
Added messaging to show files being downloaded when using the Gremlin Server "install" command.
Added test name and class arguments to the GraphProvider.loadGraphWith method.
Merged ReferencedXXX and DetachedXXX so that all migration of graph element data is via DetachedXXX.
Added StaticVertexProgram and StaticMapReduce which simply return this on clone().
VertexProgram and MapReduce now implement Cloneable and is used for fast copying across workers within the same machine.
Added TraversalHolder interface which extends PathConsumer to determine recursively if nested traversals require path calculations turned on.
Reworked how a TraverserGenerator is retrieved and utilized.
Added Traversal.toBulkSet() to make getting resultant data more efficiently for traversals with repeated data.
Provided a helper LocalStep.isLocalStarGraph() so GraphComputer implementers know the requisite data boundaries.
Created Traversal.Admin to hide administrative methods. Added Traversal.asAdmin() to get at Traversal.Admin.
Fixed up all Step cloning operations realizing that Java8 lambdas are always bound to the calling class (no delegates).
Usage of :remote close without configured remotes shows a reasonable message rather than a stack trace.
Provided LocalStep to signify that the internal traversal is locally bound to the incoming object.
Failed script evaluation in Gremlin Server now triggers the cancel of the process attempting to timeout the script if it were to run too long.
Greatly increased the speed of ScriptEngineLambda by making use of a static ScriptEngine cache.
Fixed a general bug in all sideEffect using steps where the sideEffect should be accessed via the Traverser not Traversal.
GremlinPlugin interface no longer has the additionalDependencies method - those dependencies are now defined by an entry in the manifest file for the jar called Gremlin-Plugin-Dependencies.
Added TinkerWorkerPool which is used for resource efficient threading in TinkerGraphComputer.
MapReduce.createMapReduce(Configuration) now exists and serves the same purpose as VertexProgram.createVertexProgram(Configuration).
Enabled SessionOps to be extended. Added eval handler hook.
Setting a property with an unsupported data type throw IllegalArgumentException instead of UnsupportedOperationException as the operation is supported, but the argument is not.

TinkerPop 3.0.0.M6 (Release Date: December 2, 2014)

javatuples.Pair avoided on MapReduce API in favor of a new KeyValue class.
Renamed Gremlin-Plugin manifest entry for plugins to Gremlin-Plugin-Paths.
Added Gremlin-Plugin-Dependencies manifest entry to list other dependencies that should be retrieved with a plugin jar.
Memory.Admin.asImmutable() yields an immutable representation of the GraphComputer Memory.
Fixed host selection in gremlin-driver by properly accounting for all hosts being marked unavailable at the instantiation of a Client.
Removed Giraph-Gremlin in favor of new Hadoop-Gremlin with GiraphGraphComputer support. Future support for MapReduceGraphComputer.
Greatly simplified the InputFormat and OutputFormat model for working with Giraph (and Hadoop).
Added a serializer for Property for GraphSON correcting format of serialization of a single Property on an Edge.
Fixed bug in Gremlin Console that prevented assignments to empty List objects.
Added VertexProgram.getMessageScopes() to allow vendors to know which MessageScopes at a particular Memory state.
Reduced the number of methods in MessageScope.Local as its up to vendors to inspect provided incident Traversal accordingly.
Renamed MessagesType to MessageScope to make it less ambiguous regarding the class of the messages being sent.
Changed the message type of TraversalVertexProgram to TraverserSet to support message combining.
Added VertexProgram.getMessageCombiner() to support the combining of messages in route to a vertex.
Reduced object creation in TraversalVertexProgram around vertex-local traversal sideEffects.
Renamed Traverser.Admin.makeChild() and Traverser.Admin.makeSibling() to Traverser.Admin.split() to correspond with merge().
Added Traverser.Admin.merge(Traverser) method so that the merging algorithm is with the Traverser.
Added Operator enum that contains sack-helpful BinaryOperators: sum, minus, mult, div, max, min, etc.
Added GraphTraversal.withSack() and renamed trackPaths() and with() to withPath() and withSideEffect(), respectively.
Added the "Gremlin Sacks" feature to allow a Traverser to carry local information along its walk.
GraphSON format no longer makes use of hiddens JSON key. Its all just properties.
Added DoubleIterator to make vendor implementations of Edge.iterators().vertexIterator() efficient.
PropertiesStep is smart about hiddens vs. properties.
Element.iterators().hiddenProperties() no longer exists. For vendors, simply provide an iterator of properties.
GIRAPH_GREMLIN_LIBS supports colon separated directories for loading jars from multiple paths.
Introduced method to control the location of dependencies dynamically loaded to the Gremlin Console as part of the :install command.
Fixed problem with the Neo4j Gremlin Plugin not loading properly after Gremlin Console restart.
Removed the "use" configuration from Gremlin Server.
Moved SugarGremlinPlugin from gremlin-console to gremlin-groovy so that it could be shared with Gremlin Server.
Fixed bug in serialization of null results returned to the Gremlin Console when serializing to strings.
Moved the GremlinPlugin for TinkerGraph to tinkergraph-gremlin module (it is no longer in gremlin-console).
Added a plugin-info.txt file to Gremlin Console /ext/{module} subdirectories to identify the module that was originally requested.
Gremlin Server now allows for the explicit configuration of plugin activation.
Refactored GremlinPlugin and AbstractGremlinPlugin to better account for plugins that run on the server and those that run in the console.
Added a plugins configuration to Gremlin Server to control the plugins that are enabled on initialization.
Added a builder option to GremlinExecutor to control the plugins that are enabled on initialization.
Added RemoteException for usage with RemoteAcceptor implementations for the Gremlin Console so as to better standardize their development.
Standardized all text being written to the Gremlin Console using starting upper case letter.
Prevented error in the Console when :submit is called but no remotes were configured.
Provided a way to clean the grapes directory as part of a standard build with mvn clean install.

TinkerPop 3.0.0.M5 (Release Date: November 7, 2014)

Removed PropertyFilterIterator as using Java8 streams was just as efficient for the use case.
Renamed KryoWritable to GremlinWritable as it is not necessarily Kryo that is the serialization mechanism.
Fixed an input split bug in Giraph that was making it so that splits were not always at vertex boundaries.
Fixed a combiner bug in GirapGraphComputer. Combiners were always calling MapReduce.reduce(), not MapReduce.combine().
Greatly simplified SubgraphStrategy by removing requirements for Traversal introspection.
StrategyWrappedGraph mimics vendor use of GraphStep and GraphTraversal and no longer requires dynamic strategy application.
TraversalStrategies make use of a dependency tree sorting algorithm to ensure proper sorts prior to application.
TraversalStrategies are now immutable and are bound to the Traversal class.
Fixed bug in Gephi Plugin that prevented it from communicating with the Gephi Streaming Server.
Renamed MessageType.XXX.to() to MessageType.XXX.of() so it makes sense in both the sending and receiving context.
Improved messaging with respect to tests that are ignored due to features to make it clear that those tests are not in error.
Relaxed exception consistency checks in the test suite to only check that a thrown exception from an implementation extends the expected exception class (but no longer validates that it is the exact class or that the message text).
VertexProgram now has workerIterationStart() and workerIterationEnd() to allow developers to control vertex split static data structures.
TraversalVertexProgram startup time greatly reduced due to being smart about loadState() behavior.
Gremlin Server sessions now allow serialization of results that were part of an open transaction.
Refactor OpProcessors implementations in Gremlin Server for better reusability.
Vertex.iterators() no longer have a branchFactor. This is now at the query language level with localLimit().
Added limit(long) and localLimit(int,int) which simply call the range equivalents with 0 as the low.
Added LocalRangeStep which supports ranging the edges and properties of an element — localRange(int,int).
GraphTraversal.value(String) no longer exists. Instead, use GraphTraversal.values(String).
HiddenXXXStep and ValueXXXStep no longer exist. PropertyXXXStep takes a PropertyType to denote value and hidden access.
Added PropertyType to the structure-package which provide markers for denoting property types (vs. property classes).
Renamed setWorkingDirectory to workingDirectory in the KryoReader builder.
Path.get(String) returns the object if only one object is referenced by label, else it returns a List of referenced objects.
Added overload to GremlinKryo to allow a serializer to be configured as a Function<Kryo,Serializer> to allow better flexibility in serializer creation.
Added method to GraphProvider to allow implementers to provide a mechanism to convert GraphSON serialized identifiers back to custom identifiers as needed.
Added methods to GraphProvider so that implementers could specify a custom built GremlinKryo class and/or SimpleModule class in case their implementation had custom classes to be serialized.
Added Traversal.forEachRemaining(class,consumer) for those traversals whose end type is different from declared due to strategy rewriting.
Removed Traversal.forEach() as traversal implements Iterator and users should use forEachRemaining().
RangeStep now has an inclusive low and an exclusive high — a change from Gremlin2.
DriverGremlinPlugin returns raw results with driver results available via the result variable.
Removed test enforcement of private constructor for a Graph instance.
RemoteAcceptor now supports @ prefixed lines that will grab the script string from the Gremlin Console shell.
Modified the signature of Property.element() to simply return Element
Added Reducing marker and ReducingStrategy which supports reduction-functions as a final step in Gremlin OLAP (e.g. fold()).
Once strategies are complete(), no more steps can be added to a Traversal.
Renamed Traversal.strategies() to Traversal.getStrategies() as it is not a "query language"-method.
Added test to enforce that a label on a VertexProperty is always set to the key of the owning property.
Fixed bug with multi-property removal in Neo4jGraph.
Bumped to Neo4j 2.1.5.
Used standard UUIDSerializer from the kryo-serializers library for serialization of UUID objects.
Changed GraphSON serialization to only use iterators() - there were still remnants of Traversal usage from previous refactoring.
Added overload for detach method to allow for the Element to be detached as a "reference" only (i.e. without properties).
Renamed Item in gremlin-driver to Result.
Renamed strategy to getStrategy in StrategyWrappedGraph.
Renamed baseGraph to getBaseGraph in Neo4jGraph.
Neo4jGraph now returns an empty property Vertex.property(k) when the key is non-existent (a problem only visible when meta/multi property configuration was turned off).
Traversal.Strategies.apply() now takes a TraversalEngine. Greatly simplifies strategy application for STANDARD or COMPUTER.
Renamed IdentityReductionStrategy to IdentityRemovalStrategy for reasons of clarity.
Added ComparingRemovalStrategy that removes Comparing-marked steps unless they are the end step of the traversal.
OrderStep now works in OLAP, but only makes sense as a traversal end step.
MapReduce API extended to include getMapKeySort() and getReduceKeySort() to sort outputs accordingly.
Renamed TraversalResultMapReduce to TraverserMapReduce. Shorter and makes more sense.
Improved build automation to package javadocs and asciidoc documentation in the distribution files.
Improved build automation with a script to automatically bump release versions in the various files that needed it such as the pom.xml files.
The identifier on VertexProperty is now read properly to those graphs that can support identifier assignment.
GraphSONReader.readGraph() now properly reads vertex properties.
Removed Neo4jGraph.getCypher() as users should use Neo4jGraph.cypher() and get back TinkerPop3 graph objects.
GiraphGraph.variables().getConfiguration() is now replaced by GiraphGraph.configuration().
Added Graph.configuration() which returns the Configuration object of Graph.open().
Removed TraverserTracker as now there is only a TraverserSet for all halted traversers. A nice simplification of TraversalVertexProgram.
Renamed Traverser.isDone() to Traverser.isHalted() and DONE to HALT. Consistent with automata terminology.
Removed PathTraverserExecutor and SimpleTraverserExecutor as a single TraverserExecutor correctly executes both types of traversers.
TraversalVertexProgram does "reflexive message passing" to reduce the total number of iterations required to execute a traversal.
MapReduce no-argument constructors are private and thus, only for reflection and loadState() usage.
MapReducers for TraversalVertexProgram are now smart about with() declared data structures.
Updated Traversal.SideEffects to use "registered suppliers" and it now works accordingly in both OLTP and OLAP environments.
Increased the speed of FlatMapStep by approximately 1.5x.

TinkerPop 3.0.0.M4 (Release Date: October 21, 2014)

Added features for VertexProperty user supplied ids and related data types.
Removed SideEffectCap marker interface as there is only one SideEffectCapStep and thus, instanceof is sufficient.
Path.getObjects()/Path.getLabels() renamed to Path.objects()/Path.labels() to be in line with "query language" naming convention.
Greatly simplified GiraphInternalVertex due to Element.graph() — 1/2 the memory footprint and reduced construction time.
Renamed Property.getElement() to Property.element() given the "query language" naming convention.
Element.graph() added which returns the Graph that the element is contained within.
Added tests for greater consistency around iterating hidden properties.
Simplified TraversalVertexProgram where only a single TraverserTracker exists for both path- and simple-traversers.
Fixed a major bug where Arrays.binarySearch was being used on an unsorted array in TinkerGraph and Neo4jGraph.
Changed ComputerResult.getXXX() to graph() and memory() to be consistent with "query language" naming convention.
Traverser.getXXX() changed to loops(), bulk(), path(), sideEffects() to be consistent with "query language" naming convention.
Optimization to reduce the number of empty lists created due to no step class existing for respective TraversalStrategy.apply().
Added CapTraversal as a marker interface for the cap() method.
Added union() with GraphComputer UnionLinearStrategy.
TimeLimitStep was moved to filter/ package. It was a mistake that it was in sideEffect/.
Provided the configuration for generating both a "full" and "core" set of javadocs, where "full" represents all classes in all projects and "core" is the "user" subset.
Validated bindings passed to Gremlin Server to ensure that they do not match the most common statically imported values.
If no script engine name is provided to a LambdaHolder it is assumed to be Gremlin-Groovy.
MapEmitter and ReduceEmitter have an emit(value) default method where the key is the MapReduce.NullObject singleton.
Traverser.Admin now implements Attachable as the Traversal.SideEffects can be generated from the Vertex.
Made a solid effort to ensure that all TinkerPop keys are Graph.System to leave Graph.Key for users.
The Graph.System prefix is now ^ instead of %&%. Simpler and easier on the toString()-eyes.
Added Traversal.SideEffects.ifPresent(Consumer) as a default helper method.
Added profile()-step which provides detailed information about the performance of each step in a traversal.
No more CountCapStep and CountStep, there is only CountStep and it is elegant.
Created a AbstractTraversalStrategy with good toString(), hasCode(), and equals() implementations.
Added CountTraversal as a marker-interface stating that the Traversal has a count() → Long method.
Traversal no longer has any step methods as its not required for DSL implementers to have "core steps."
Added "linearization" strategy for ChooseStep so it is executed correctly on GraphComputer.
Added GraphTraversalStrategyRegistry which has respective global strategies to make turning on/off strategies easier.
Added a generic BranchStep to be used for re-writing "meta-steps" for execution on GraphComputer.
Moved JumpStep, UntilStep, and ChooseStep to a new branch/ package.
Added test cases to the Structure Suite to enforce consistent operations of reading properties after removal of their owning Element.
GraphSON format change for full Graph serialization - Graph variables are now serialized with the key "variables" as opposed to "properties".
Relaxed Graph.toString() test requirements for implementers.
Made the toString operations in GraphStrategy consistent.
Added VertexFeatures.supportsRemoveProperty.
Added VertexPropertyFeatures.supportsRemoveProperty.
Added EdgeFeatures.supportsRemoveProperty.
Added VertexFeatures.supportsRemoveVertices.
Added EdgeFeatures.supportsRemoveEdges.
Vendors should now get a clear error when mis-spelling something in an @OptOut (or more likely if a test name changes) and it now works all the test suites.
All plugins now have a default prefix of "tinkerpop." as a namespace.
GraphComputer now executes a Set<MapReduce> and hashCode()/equals() were implemented for existing MapReduce implementations.
Changed Contains.in/notin to Contains.within/without as in is a reserved term in most languages (including Java and Groovy).
Added helper methods for loading data into collections in TraversalHelper.
Core Traversal methods are smart about bulking — e.g. iterate(), fill(), remove(), etc.
GroupByStep and GroupByMapReduce leverage BulkSet as the default group data structure.
Element.Iterator has renamed methods so implementers can do MyElement implements Element, Element.Iterators.
Renamed MessageType.Global and MessageType.Local creators from of() to to() as it makes more sense to send messages to().
With Traverser.get/setBulk() there is no need for a TraverserMessage. The Traverser is now the message in TraversalVertexProgram.
Provided static make() methods for constructing Path implementations.
Provided a more space/time efficient algorithm for Path.isSimple().
The JumpStep GraphComputer algorithm Queue is now a TraverserSet.
AggregateStep and StoreStep now use BulkSet as their default backing Collection (much more space/time efficient).
Added BulkSet which is like TraverserSet but for arbitrary objects (i.e. a weighted set).
UnrollJumpStrategy is no longer a default strategy as it is less efficient with the inclusion of TraverserSet.
Introduced TraverserSet with bulk updating capabilities. Like OLAP, OLTP looping is now linear space/time complexity.
TinkerGraph’s MapReduce framework is now thread safe with a parallel execution implementation.
Added a default Traverser.asAdmin() method as a typecast convenience to Traverser.Admin.
Renamed Traverser.System to Traverser.Admin as to not cause java.lang.System reference issues.
Renamed Memory.Administrative to Memory.Admin to make it shorter and consistent with Traverser.Admin.
Fixed a TinkerGraph bug around user supplied vertex property ids.
Most Step classes are now defined as public final class to prevent inheritance.
ShuffleStep now extends BarrierStep which enables semantically correct step-sideEffects.
Leveraged Traverser.getBulk() consistently throughout all steps.

TinkerPop 3.0.0.M3 (Release Date: October 6, 2014)

All Step fields are now private/protected with respective getters as currently needed and will be added to as needed.
Gremlin Server no longer has the traverse operation as lambdas aren’t really serialized.
Path is now an interface with ImmutablePath and MutablePath as implementations (2x speedup on path calculations).
Traverser now implements Comparable. If the underlying object doesn’t implement Comparable, then a runtime exception.
Added abstract BarrierStep which greatly simplifies implementing barriers like AggregateStep, OrderStep, etc.
SelectStep is now intelligent about when to trigger path computations based on label selectors and barriers.
T no longer has eq, neq, lt, in, etc. Renamed all respective enums and with static import, good in console (e.g. Compare.eq).
Added Order enum which provides Order.decr and Order.incr.
Traverser.loops and Jump.loops are now shorts (32767 max-loops is probably sufficient for 99.9999% of use cases).
Traverser.bulk exists which is how many instances does the traverser represent. For use in grouping with bulk computations.
Greatly simplified sideEffect steps where there is no distinction between OLAP vs. OLTP (from the Step perspective).
Removed the need for Bulkable and VertexCentric marker interfaces in process API.
Renamed configuration parameters in Giraph-Gremlin to be consistent with a giraph.gremlin-prefix.
Made it possible to pass a ScriptEngine name and string script in TraversalVertexProgram and LambdaVertexProgram.
Made TinkerGraph a plugin for the Console as it is no longer a direct dependency in gremlin-groovy.
Added features for supporting the addition of properties via Element.property(String,Object).
GiraphGraph OLTP tested against Gremlin-Java8 and Gremlin-Groovy — OLAP tested against Gremlin-Groovy.
Neo4jGraph is now tested against both Gremlin-Java8 and Gremlin-Groovy.
Renamed the test cases in ProcessTestSuite to be consistent with other Gremlin language variants.
Added a gremlin-groovy-test suite that can be used to validate implementations against the Groovy variant of Gremlin.
TinkerGraph is no longer serializable, use a GraphReader/GraphWriter to serialize the graph data.
Removed implements Serializable on numerous classes to ensure safety and proper usage of utilities for cloning.
Traversal now implements Cloneable as this is the means that inter-JVM threads are able to get sibling Traversals.
Created "integration" test for Neo4jGraph that runs the test suite with multi/meta property features turned off.
Added GraphStrategy methods for VertexProperty.
Converted the id data type from string to integer in the Grateful Dead sample data.
Removed all notions of serializable lambdas as this is a misconception and should not be part of TinkerPop.
Greatly simplified TraversalVertexProgram with three arguments: a Traversal<Supplier>, Class<Traversal<Supplier>>, or a script string with ScriptEngine name.
Added TraversalScript interface with GroovyTraversalScript as an instance. To be used by OLAP engines and any language variant (e.g. gremlin-scala, gremlin-js, etc.).
UntilStep now leverages UnrollJumpStrategy accordingly.
Fixed a bug where the toString() of Traversal was being hijacked by SugarGremlinPlugin.
Fixed compilation bug in UntilStep that is realized when used in multi-machine OLAP.
Simplified Enumerator and implementations for MatchStep.

TinkerPop 3.0.0.M2 (Release Date: September 23, 2014)

Added an exhaust InnerJoinEnumerator fix in MatchStep to get all solutions correctly.
Neo4jGraph can be configured to allow or disallow meta- and multi-properties.
Added until()-step as a simpler way to express while-do looping which compiles down to a jump()-step equivalent.
Added "The Crew" (CREW) toy graph which contains multi-properties, meta-properties, graph variables, hiddens, etc.
If the Giraph job fails, then the subsequent MapReduce jobs will not execute.
Added Graph.System class which generates keys prefixed with %&% which is considered the vendor namespace and not allowed by users.
Added ReferencedVertex (etc. for all graph object types) for lightweight message passing of graph object ids.
T.* now has label, id, key, value and no longer are these String representations reserved in TinkerPop.
Traverser now has a transient reference to Traversal.SideEffects.
"Detached" classes are now tested by the standard test suite.
Compartmentalized Traverser interface so there is now a Traverser.System sub-interface with methods that users shouldn’t call.
Added OrderByStep which orders Elements according to the value of a provided key.
2x speed increase on steps that rely heavily on ExpandableStepIterator with massive memory footprint reduction as well.
Added VertexProperty<V> as the property type for vertices — provides multi-properties and properties on properties for vertices.
Changed VertexProgram such that getElementComputeKeys() is simply a Set<String>.
Significant changes to the format of the ResponseMessage for Gremlin Server - these changes break existing clients.
Close any open transactions on any configured Graph when a session in Gremlin Server is killed.
Grateful Dead Graph now uses vertex labels instead of "type" properties.
There is now a GraphComputerStrategy and EngineDependent marker interface to allow steps to decide their algorithm depending if they are OLAP or OLTP.
A labeled step now stores its current traverser value in Traversal.SideEffects (no longer can sideEffectKeys and step labels be the same).
GraphFactory support for opening a Graph with multiple GraphStrategy instances - if there are multiple strategies they are wrapped in order via SequenceGraphStrategy.
The result type for result termination messages returned from Gremlin Server is now set to "no content".
The maxContentLength setting for Gremlin Driver now blocks incoming frames that are too large.
After initialization scripts are executed in Gremlin Server, the Graph instances are re-bound back to their global references, thus allowing GraphStrategy initialization or even dynamic Graph creation through scripts.
Added "Modern" graph back which is basically the "Classic" graph with double values for the "weight" property on edges and non-default vertex labels.
Traversal.addStep() is now hard typed so type casting isn’t required and traversal APIs look clean.
Changed the hidden key prefix from %$% to ~ in Graph.Key.hide().
Added has(label,key,predicate,value) to allow for has('person','name','marko'). Various overloaded methods provided.
Update to traversal API where if a SFunction<S,?> was required, but can process a Traverser<S>, then the function is SFunction<Traverser<S>,?>.
Added WhereStep as a way to further constrain select() and match().
Extensive work on GiraphMemory and its interaction with Giraph aggregators.
If the input path of a GiraphGraphComputer does not exist, failure happens prior to job submission.
SugarPlugin now has all inefficient methods and Gremlin-Groovy proper is only efficient Groovy techniques.
Prevented concurrency problems by only modifying bindings within the same thread of execution in the GremlinExecutor.
Calls to use on the DependencyManager now return the list of GremlinPlugin instances to initialize instead of just initializing them automatically because it causes problems with ScriptEngine setup if a plugin requires a script to be evaluated and a required dependency is not yet loaded.
Traversal.SideEffects has getGraph(), setGraph(), and removeGraph() default helpers.
Traversal.Memory → Traversal.SideEffects and GraphComputer.SideEffects → GraphComputer.Memory.
StrategyWrappedVertex and StrategyWrappedEdge properly wrap Element objects returned from non-traversal based methods.
Gremlin-Server now sends a single write with status 200 for Object and empty response messages.
GremlinGroovyScriptEngine allows imports to re-import dependencies added via "use".
Changed order in which the GremlinExecutor is initialized such that dependency loading via "use" are handled first which fixes problems with starting Gremlin Server with gremlin-server-neo4j.yaml.
Corrected issues with the "branch factor" related traversals under SubgraphStrategy. This change also altered the semantics of the SubgraphStrategy a bit as it became more restrictive around Edge inclusion (requires both vertices to be in the subgraph).
The Gephi Plugin now visualizes traversals and has numerous configuration options.
Added more specific features around the types of "identifiers" a graph can support.
Added a new test graph called MODERN that is copy of the CLASSIC graph, but represents floats as doubles. This graph will be the default graph for testing going forward.
Fix bug in Neo4jGraph that was not processing multiple vertex labels properly when doing a has() step with IN.
Changed semantics of @LoadGraphWith in gremlin-test to only refer to the ability of a test implementation to process the data types of the test graph (not to actually load it).
StartStep is a SideEffect as it is a process to get data into the stream (like a keyboard) and more efficient as such.
Greatly simplified the implementations of Map, FlatMap, Filter, and SideEffect.
Path data structure changed to an ordered list of objects with each associated to a Set<String> of as-labels.
All sideEffect-based steps no longer extend FilterStep with predicate equal true, but a more efficient SideEffectStep.
TreeStep now has TreeMapReduce for executing on GraphComputer.
Neo4jTraversal.cypher() is fluent throughout.
Reverted back to TP2 model of as() referring to step names, not variable names of sideEffects.
Updated AddEdge-step to support property key/value pairs for appending to newly created edges.
Renamed Graph.getFeatures() to Graph.features() to be consistent with other API methods.
Vertex and Edge now implement all GraphTraversal methods to ensure consistency throughout stack.
Neo4jTraversal is auto-generated from Neo4jTraversalStub with technique generalizable to other vendors.
Added test suite to ensure that all traversals are of the same type: g.V, g.E, g.of(), v.identity(), e.identity(), v-, e-methods.
Giraph HDFS helpers now support hdfs.mkdir(string) and local.mkdir(string)
Added @OptIn and @OptOut for implementers to specify on their Graph implementations for test compliance information.
GraphComputer Memory now immutable after computation is complete.
Dependency grabbing for plugins filter out slf4j logging dependencies so as to avoid multiple bindings with the standard TinkerPop distributions.
Fixed GiraphMemory to be fully consistent with GraphComputer specification.
Removed fatJar assembly from Giraph-Graph as it is no longed needed with distributed cache model.
Reworked GiraphRemoteAcceptor to provide a result variable back to the console with ComputerResult.
VertexProgram is no longer Serializable (use loadState and storeState for wire-propagation).
Moved GiraphGraph.getOutputGraph() to GiraphHelper.
Changed GIRAPH_GREMLIN_HOME to GIRAPH_GREMLIN_LIB to reference directory where jars are to be loaded.
Updated README with release instructions.

TinkerPop 3.0.0.M1 (Release Date: August 12, 2014)

First official release of TinkerPop3 and thus, no changes.

Files

CHANGELOG.asciidoc

Latest commit

History

CHANGELOG.asciidoc

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TinkerPop3 CHANGELOG

TinkerPop 3.7.0 (NOT OFFICIALLY NAMED YET)

TinkerPop 3.7.0 (Release Date: NOT OFFICIALLY RELEASED YET)

TinkerPop 3.6.0 (Tinkerheart)

TinkerPop 3.6.2 (Release Date: NOT OFFICIALLY RELEASED YET)

TinkerPop 3.6.1 (Release Date: July 18, 2022)

Bugs

Improvements

TinkerPop 3.6.0 (Release Date: April 4, 2022)

Bugs

Improvements

TinkerPop 3.5.0 (The Sleeping Gremlin: No. 18 Entr’acte Symphonique)

TinkerPop 3.5.5 (Release Date: January 16, 2023)

Bugs

Improvements

TinkerPop 3.5.4 (Release Date: July 18, 2022)

Bugs

Improvements

TinkerPop 3.5.3 (Release Date: April 4, 2022)

Bugs

Improvements

TinkerPop 3.5.2 (Release Date: January 10, 2022)

Bugs

Improvements

TinkerPop 3.5.1 (Release Date: July 19, 2021)

Bugs

Improvements

TinkerPop 3.5.0 (Release Date: May 3, 2021)

Bugs

Improvements

TinkerPop 3.4.0 (Avant-Gremlin Construction #3 for Theremin and Flowers)

TinkerPop 3.4.13 (Release Date: January 10, 2022)

Bugs

Improvements

TinkerPop 3.4.12 (Release Date: July 19, 2021)

Bugs

Improvements

TinkerPop 3.4.11 (Release Date: May 3, 2021)

Bugs

Improvements

TinkerPop 3.4.10 (Release Date: January 18, 2021)

Bugs

Improvements

TinkerPop 3.4.9 (Release Date: December 7, 2020)

Bugs

Improvements

TinkerPop 3.4.8 (Release Date: August 3, 2020)

Bugs

Improvements

TinkerPop 3.4.7 (Release Date: June 1, 2020)

Bugs

Improvements

TinkerPop 3.4.6 (Release Date: February 20, 2020)

Bugs

TinkerPop 3.4.5 (Release Date: February 3, 2020)

Bugs

Improvements

TinkerPop 3.4.4 (Release Date: October 14, 2019)

Bugs

Improvements

TinkerPop 3.4.3 (Release Date: August 5, 2019)

Bugs

Improvements

TinkerPop 3.4.2 (Release Date: May 28, 2019)

Bugs

Improvements

TinkerPop 3.4.1 (Release Date: March 18, 2019)

Bugs

Improvements

TinkerPop 3.4.0 (Release Date: January 2, 2019)

Bugs

Improvements

TinkerPop 3.3.0 (Gremlin Symphony #40 in G Minor)

TinkerPop 3.3.11 (Release Date: June 1, 2020)