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executor: fix hang in hash agg when exceeding memory limit leads to panic (#57641) #57696

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merged 5 commits into from
Nov 26, 2024
Merged

executor: fix hang in hash agg when exceeding memory limit leads to panic (#57641) #57696

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e7c72f3
fix
xzhangxian1008 Nov 22, 2024
62aa588
move
xzhangxian1008 Nov 25, 2024
f0bd374
tweaking
xzhangxian1008 Nov 25, 2024
33ce20b
fix
xzhangxian1008 Nov 25, 2024
0dfe17b
tweaking
xzhangxian1008 Nov 25, 2024
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33 changes: 17 additions & 16 deletions pkg/executor/aggregate/agg_hash_partial_worker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -71,25 +71,16 @@ type HashAggPartialWorker struct {
inflightChunkSync *sync.WaitGroup
}

func (w *HashAggPartialWorker) getChildInput() bool {
func (w *HashAggPartialWorker) getChildInput() (*chunk.Chunk, bool) {
select {
case <-w.finishCh:
return false
return nil, false
case chk, ok := <-w.inputCh:
if !ok {
return false
}

sizeBefore := w.chk.MemoryUsage()
w.chk.SwapColumns(chk)
w.memTracker.Consume(w.chk.MemoryUsage() - sizeBefore)

w.giveBackCh <- &HashAggInput{
chk: chk,
giveBackCh: w.inputCh,
return nil, false
}
return chk, true
}
return true
}

func (w *HashAggPartialWorker) fetchChunkAndProcess(ctx sessionctx.Context, hasError *bool, needShuffle *bool) bool {
Expand All @@ -99,14 +90,24 @@ func (w *HashAggPartialWorker) fetchChunkAndProcess(ctx sessionctx.Context, hasE
}

waitStart := time.Now()
ok := w.getChildInput()
updateWaitTime(w.stats, waitStart)

chk, ok := w.getChildInput()
if !ok {
return false
}

defer w.inflightChunkSync.Done()
updateWaitTime(w.stats, waitStart)

w.intestDuringPartialWorkerRun()

sizeBefore := w.chk.MemoryUsage()
w.chk.SwapColumns(chk)
w.memTracker.Consume(w.chk.MemoryUsage() - sizeBefore)

w.giveBackCh <- &HashAggInput{
chk: chk,
giveBackCh: w.inputCh,
}

execStart := time.Now()
if err := w.updatePartialResult(ctx, w.chk, len(w.partialResultsMap)); err != nil {
Expand Down