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Refactor Iceberg connector to support call distributed procedure
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...ceberg/src/main/java/com/facebook/presto/iceberg/CallDistributedProcedureSplitSource.java
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| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.facebook.presto.iceberg; | ||
|
|
||
| import com.facebook.presto.iceberg.delete.DeleteFile; | ||
| import com.facebook.presto.spi.ConnectorSession; | ||
| import com.facebook.presto.spi.ConnectorSplit; | ||
| import com.facebook.presto.spi.ConnectorSplitSource; | ||
| import com.facebook.presto.spi.SplitWeight; | ||
| import com.facebook.presto.spi.connector.ConnectorPartitionHandle; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.io.Closer; | ||
| import org.apache.iceberg.FileScanTask; | ||
| import org.apache.iceberg.PartitionSpec; | ||
| import org.apache.iceberg.PartitionSpecParser; | ||
| import org.apache.iceberg.TableScan; | ||
| import org.apache.iceberg.io.CloseableIterable; | ||
| import org.apache.iceberg.io.CloseableIterator; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.UncheckedIOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.function.Consumer; | ||
|
|
||
| import static com.facebook.presto.hive.HiveCommonSessionProperties.getNodeSelectionStrategy; | ||
| import static com.facebook.presto.iceberg.FileFormat.fromIcebergFileFormat; | ||
| import static com.facebook.presto.iceberg.IcebergUtil.getDataSequenceNumber; | ||
| import static com.facebook.presto.iceberg.IcebergUtil.getPartitionKeys; | ||
| import static com.facebook.presto.iceberg.IcebergUtil.partitionDataFromStructLike; | ||
| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
| import static com.google.common.collect.Iterators.limit; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.concurrent.CompletableFuture.completedFuture; | ||
|
|
||
| public class CallDistributedProcedureSplitSource | ||
| implements ConnectorSplitSource | ||
| { | ||
| private CloseableIterator<FileScanTask> fileScanTaskIterator; | ||
| private Optional<Consumer<FileScanTask>> fileScanTaskConsumer; | ||
|
|
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| private final TableScan tableScan; | ||
| private final Closer closer = Closer.create(); | ||
| private final double minimumAssignedSplitWeight; | ||
| private final ConnectorSession session; | ||
|
|
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| public CallDistributedProcedureSplitSource( | ||
| ConnectorSession session, | ||
| TableScan tableScan, | ||
| CloseableIterable<FileScanTask> fileScanTaskIterable, | ||
| Optional<Consumer<FileScanTask>> fileScanTaskConsumer, | ||
| double minimumAssignedSplitWeight) | ||
| { | ||
| this.session = requireNonNull(session, "session is null"); | ||
| this.tableScan = requireNonNull(tableScan, "tableScan is null"); | ||
| this.fileScanTaskIterator = fileScanTaskIterable.iterator(); | ||
| this.fileScanTaskConsumer = requireNonNull(fileScanTaskConsumer, "fileScanTaskConsumer is null"); | ||
| this.minimumAssignedSplitWeight = minimumAssignedSplitWeight; | ||
| closer.register(fileScanTaskIterator); | ||
| } | ||
|
|
||
| @Override | ||
| public CompletableFuture<ConnectorSplitBatch> getNextBatch(ConnectorPartitionHandle partitionHandle, int maxSize) | ||
| { | ||
| // TODO: move this to a background thread | ||
| List<ConnectorSplit> splits = new ArrayList<>(); | ||
| Iterator<FileScanTask> iterator = limit(fileScanTaskIterator, maxSize); | ||
| while (iterator.hasNext()) { | ||
| FileScanTask task = iterator.next(); | ||
| fileScanTaskConsumer.ifPresent(consumer -> consumer.accept(task)); | ||
| splits.add(toIcebergSplit(task)); | ||
| } | ||
| return completedFuture(new ConnectorSplitBatch(splits, isFinished())); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isFinished() | ||
| { | ||
| return !fileScanTaskIterator.hasNext(); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() | ||
| { | ||
| try { | ||
| closer.close(); | ||
| // TODO: remove this after org.apache.iceberg.io.CloseableIterator'withClose | ||
| // correct release resources holds by iterator. | ||
| fileScanTaskIterator = CloseableIterator.empty(); | ||
| } | ||
| catch (IOException e) { | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| } | ||
|
|
||
| private ConnectorSplit toIcebergSplit(FileScanTask task) | ||
| { | ||
| PartitionSpec spec = task.spec(); | ||
| Optional<PartitionData> partitionData = partitionDataFromStructLike(spec, task.file().partition()); | ||
|
|
||
| // TODO: We should leverage residual expression and convert that to TupleDomain. | ||
| // The predicate here is used by readers for predicate push down at reader level, | ||
| // so when we do not use residual expression, we are just wasting CPU cycles | ||
| // on reader side evaluating a condition that we know will always be true. | ||
|
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||
| return new IcebergSplit( | ||
| task.file().path().toString(), | ||
| task.start(), | ||
| task.length(), | ||
| fromIcebergFileFormat(task.file().format()), | ||
| ImmutableList.of(), | ||
| getPartitionKeys(task), | ||
| PartitionSpecParser.toJson(spec), | ||
| partitionData.map(PartitionData::toJson), | ||
| getNodeSelectionStrategy(session), | ||
| SplitWeight.fromProportion(Math.min(Math.max((double) task.length() / tableScan.targetSplitSize(), minimumAssignedSplitWeight), 1.0)), | ||
| task.deletes().stream().map(DeleteFile::fromIceberg).collect(toImmutableList()), | ||
| Optional.empty(), | ||
| getDataSequenceNumber(task.file())); | ||
| } | ||
| } |
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