Merge pull request #19405 from miancheng7/fix-compaction-induce-latency

[release-3.5] Fix a performance regression due to uncertain compaction sleep interval

Author: ahrtr

server/mvcc/kvstore_compaction.go

@@ -39,8 +39,6 @@ func (s *store) scheduleCompaction(compactMainRev, prevCompactRev int64) (KeyVal
 	binary.BigEndian.PutUint64(end, uint64(compactMainRev+1))
 
 	batchNum := s.cfg.CompactionBatchLimit
-	batchTicker := time.NewTicker(s.cfg.CompactionSleepInterval)
-	defer batchTicker.Stop()
 	h := newKVHasher(prevCompactRev, compactMainRev, keep)
 	last := make([]byte, 8+1+8)
 
@@ -90,7 +88,7 @@ func (s *store) scheduleCompaction(compactMainRev, prevCompactRev int64) (KeyVal
 		dbCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
 
 		select {
-		case <-batchTicker.C:
+		case <-time.After(s.cfg.CompactionSleepInterval):
 		case <-s.stopc:
 			return KeyValueHash{}, fmt.Errorf("interrupted due to stop signal")
 		}