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pkg/lightning : remove get_regions call in physical backend (#46202) #46337

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merged 2 commits into from
Dec 11, 2023
Merged

pkg/lightning : remove get_regions call in physical backend (#46202) #46337

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0fe2d1a
This is an automated cherry-pick of #46202
mittalrishabh Aug 23, 2023
c4a6615
fix conflict
D3Hunter Dec 11, 2023
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2 changes: 1 addition & 1 deletion br/pkg/lightning/backend/local/local.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1086,7 +1086,7 @@ func (local *Backend) prepareAndSendJob(
failpoint.Break()
})

err = local.SplitAndScatterRegionInBatches(ctx, initialSplitRanges, engine.tableInfo, needSplit, regionSplitSize, maxBatchSplitRanges)
err = local.SplitAndScatterRegionInBatches(ctx, initialSplitRanges, needSplit, maxBatchSplitRanges)
if err == nil || common.IsContextCanceledError(err) {
break
}
Expand Down
28 changes: 1 addition & 27 deletions br/pkg/lightning/backend/local/localhelper.go
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Original file line number Diff line number Diff line change
Expand Up @@ -113,17 +113,15 @@ func (g *TableRegionSizeGetterImpl) GetTableRegionSize(ctx context.Context, tabl
func (local *Backend) SplitAndScatterRegionInBatches(
ctx context.Context,
ranges []Range,
tableInfo *checkpoints.TidbTableInfo,
needSplit bool,
regionSplitSize int64,
batchCnt int,
) error {
for i := 0; i < len(ranges); i += batchCnt {
batch := ranges[i:]
if len(batch) > batchCnt {
batch = batch[:batchCnt]
}
if err := local.SplitAndScatterRegionByRanges(ctx, batch, tableInfo, needSplit, regionSplitSize); err != nil {
if err := local.SplitAndScatterRegionByRanges(ctx, batch, needSplit); err != nil {
return errors.Trace(err)
}
}
Expand All @@ -137,9 +135,7 @@ func (local *Backend) SplitAndScatterRegionInBatches(
func (local *Backend) SplitAndScatterRegionByRanges(
ctx context.Context,
ranges []Range,
tableInfo *checkpoints.TidbTableInfo,
needSplit bool,
regionSplitSize int64,
) (err error) {
if len(ranges) == 0 {
return nil
Expand All @@ -160,7 +156,6 @@ func (local *Backend) SplitAndScatterRegionByRanges(
scatterRegions := make([]*split.RegionInfo, 0)
var retryKeys [][]byte
waitTime := splitRegionBaseBackOffTime
skippedKeys := 0
for i := 0; i < splitRetryTimes; i++ {
log.FromContext(ctx).Info("split and scatter region",
logutil.Key("minKey", minKey),
Expand Down Expand Up @@ -222,16 +217,6 @@ func (local *Backend) SplitAndScatterRegionByRanges(
return nil
}

var tableRegionStats map[uint64]int64
if tableInfo != nil {
tableRegionStats, err = local.regionSizeGetter.GetTableRegionSize(ctx, tableInfo.ID)
if err != nil {
log.FromContext(ctx).Warn("fetch table region size statistics failed",
zap.String("table", tableInfo.Name), zap.Error(err))
tableRegionStats, err = make(map[uint64]int64), nil
}
}

regionMap := make(map[uint64]*split.RegionInfo)
for _, region := range regions {
regionMap[region.Region.GetId()] = region
Expand Down Expand Up @@ -342,15 +327,6 @@ func (local *Backend) SplitAndScatterRegionByRanges(
}
sendLoop:
for regionID, keys := range splitKeyMap {
// if region not in tableRegionStats, that means this region is newly split, so
// we can skip split it again.
regionSize, ok := tableRegionStats[regionID]
if !ok {
log.FromContext(ctx).Warn("region stats not found", zap.Uint64("region", regionID))
}
if len(keys) == 1 && regionSize < regionSplitSize {
skippedKeys++
}
select {
case ch <- &splitInfo{region: regionMap[regionID], keys: keys}:
case <-ctx.Done():
Expand Down Expand Up @@ -386,11 +362,9 @@ func (local *Backend) SplitAndScatterRegionByRanges(
scatterCount, err := local.waitForScatterRegions(ctx, scatterRegions)
if scatterCount == len(scatterRegions) {
log.FromContext(ctx).Info("waiting for scattering regions done",
zap.Int("skipped_keys", skippedKeys),
zap.Int("regions", len(scatterRegions)), zap.Duration("take", time.Since(startTime)))
} else {
log.FromContext(ctx).Info("waiting for scattering regions timeout",
zap.Int("skipped_keys", skippedKeys),
zap.Int("scatterCount", scatterCount),
zap.Int("regions", len(scatterRegions)),
zap.Duration("take", time.Since(startTime)),
Expand Down
8 changes: 4 additions & 4 deletions br/pkg/lightning/backend/local/localhelper_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -477,7 +477,7 @@ func doTestBatchSplitRegionByRanges(ctx context.Context, t *testing.T, hook clie
start = end
}

err = local.SplitAndScatterRegionByRanges(ctx, ranges, nil, true, 1000)
err = local.SplitAndScatterRegionByRanges(ctx, ranges, true)
if len(errPat) == 0 {
require.NoError(t, err)
} else {
Expand Down Expand Up @@ -569,7 +569,7 @@ func TestMissingScatter(t *testing.T) {
start = end
}

err = local.SplitAndScatterRegionByRanges(ctx, ranges, nil, true, 1000)
err = local.SplitAndScatterRegionByRanges(ctx, ranges, true)
require.NoError(t, err)

splitHook.check(t, client)
Expand Down Expand Up @@ -732,7 +732,7 @@ func TestSplitAndScatterRegionInBatches(t *testing.T) {
})
}

err := local.SplitAndScatterRegionInBatches(ctx, ranges, nil, true, 1000, 4)
err := local.SplitAndScatterRegionInBatches(ctx, ranges, true, 4)
require.NoError(t, err)

rangeStart := codec.EncodeBytes([]byte{}, []byte("a"))
Expand Down Expand Up @@ -828,7 +828,7 @@ func doTestBatchSplitByRangesWithClusteredIndex(t *testing.T, hook clientHook) {
start = e
}

err := local.SplitAndScatterRegionByRanges(ctx, ranges, nil, true, 1000)
err := local.SplitAndScatterRegionByRanges(ctx, ranges, true)
require.NoError(t, err)

startKey := codec.EncodeBytes([]byte{}, rangeKeys[0])
Expand Down