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lightning: set the 17th bit of the txn_source to indicate the write source is lightning physical mode import #57706

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lightning: set the 17th bit of the txn_source to indicate the write source is lightning physical mode import #57706

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048ce79
the 17th bit is set as lightning physical import shift
3AceShowHand Nov 25, 2024
477aafe
add new one unit test to cover the shift is set
3AceShowHand Nov 26, 2024
029a553
add new one unit test to cover the shift is set
3AceShowHand Nov 26, 2024
5f237f2
Merge branch 'master' into lightning-physical-import-ignore-by-cdc
3AceShowHand Nov 26, 2024
25d2a9a
remove useless blank
3AceShowHand Nov 26, 2024
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2 changes: 2 additions & 0 deletions pkg/kv/option.go
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,8 @@ const (
LossyDDLColumnReorgSource = 1
lossyDDLReorgSourceMax = (1 << lossyDDLReorgSourceBits) - 1
lossyDDLReorgSourceShift = cdcWriteSourceBits
// LightningPhysicalImportTxnSource the 17th bit is set as the txn source for Lightning physical import.
LightningPhysicalImportTxnSource = 1 << 16
)

// SetCDCWriteSource sets the TiCDC write source in the txnSource.
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27 changes: 16 additions & 11 deletions pkg/lightning/backend/local/region_job.go
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Expand Up @@ -314,6 +314,21 @@ func (local *Backend) writeToTiKV(ctx context.Context, j *regionJob) error {
return err
}

func newWriteRequest(meta *sst.SSTMeta, resourceGroupName, taskType string) *sst.WriteRequest {
return &sst.WriteRequest{
Chunk: &sst.WriteRequest_Meta{
Meta: meta,
},
Context: &kvrpcpb.Context{
ResourceControlContext: &kvrpcpb.ResourceControlContext{
ResourceGroupName: resourceGroupName,
},
RequestSource: util.BuildRequestSource(true, kv.InternalTxnLightning, taskType),
TxnSource: kv.LightningPhysicalImportTxnSource,
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please post manual test result. I'm not sure TiKV import service will use this value.

And maybe we can add a SST table / block property to skip scanning the whole SST to reduce IO.

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maybe we can add a SST table / block property to skip scanning the whole SST to reduce IO.

It sounds great to do so, but looks more complicated since we have to consider the case such as region merge or split? Also, is it possible that there is one sst that contains lightning physical imported data and normal inserted data at the same time?

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please post manual test result. I'm not sure TiKV import service will use this value.

Yes, this PR should be get merged after test, I will post the manual test result.

https://github.com/tikv/tikv/pull/17895/files This PR set the txn_source to initialize the txn_sst_writer

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maybe we can add a SST table / block property to skip scanning the whole SST to reduce IO.

It sounds great to do so, but looks more complicated since we have to consider the case such as region merge or split? Also, is it possible that there is one sst that contains lightning physical imported data and normal inserted data at the same time?

Yes, just as a fast path. If SST merging happened we have to scan all KV.

},
}
}

func (local *Backend) doWrite(ctx context.Context, j *regionJob) error {
if j.stage != regionScanned {
return nil
Expand Down Expand Up @@ -396,17 +411,7 @@ func (local *Backend) doWrite(ctx context.Context, j *regionJob) error {
leaderID := j.region.Leader.GetId()
clients := make([]sst.ImportSST_WriteClient, 0, len(region.GetPeers()))
allPeers := make([]*metapb.Peer, 0, len(region.GetPeers()))
req := &sst.WriteRequest{
Chunk: &sst.WriteRequest_Meta{
Meta: meta,
},
Context: &kvrpcpb.Context{
ResourceControlContext: &kvrpcpb.ResourceControlContext{
ResourceGroupName: local.ResourceGroupName,
},
RequestSource: util.BuildRequestSource(true, kv.InternalTxnLightning, local.TaskType),
},
}
req := newWriteRequest(meta, local.ResourceGroupName, local.TaskType)
for _, peer := range region.GetPeers() {
cli, err := clientFactory.create(ctx, peer.StoreId)
if err != nil {
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6 changes: 6 additions & 0 deletions pkg/lightning/backend/local/region_job_test.go
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Expand Up @@ -16,6 +16,7 @@ package local

import (
"context"
"github.com/pingcap/tidb/pkg/kv"
"math/rand"
"sync"
"testing"
Expand Down Expand Up @@ -536,6 +537,11 @@ func TestCancelBalancer(t *testing.T) {
jobWg.Wait()
}

func TestNewWriteRequest(T *testing.T) {
req := newWriteRequest(&sst.SSTMeta{}, "", "")
require.Equal(T, req.Context.TxnSource, uint64(kv.LightningPhysicalImportTxnSource))
}

func TestStoreBalancerNoRace(t *testing.T) {
jobToWorkerCh := make(chan *regionJob)
jobFromWorkerCh := make(chan *regionJob)
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