https://github.com/etcd-io/etcd
Tip revision: bdc9bc1d816ebaa3c08aad36318b4f6cb807932d authored by Gyuho Lee on 29 March 2020, 19:47:27 UTC
version: 3.4.6
version: 3.4.6
Tip revision: bdc9bc1
kvstore_compaction.go
// Copyright 2015 The etcd Authors
//
// 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 mvcc
import (
"encoding/binary"
"time"
"go.uber.org/zap"
)
func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struct{}) bool {
totalStart := time.Now()
defer func() { dbCompactionTotalMs.Observe(float64(time.Since(totalStart) / time.Millisecond)) }()
keyCompactions := 0
defer func() { dbCompactionKeysCounter.Add(float64(keyCompactions)) }()
end := make([]byte, 8)
binary.BigEndian.PutUint64(end, uint64(compactMainRev+1))
last := make([]byte, 8+1+8)
for {
var rev revision
start := time.Now()
tx := s.b.BatchTx()
tx.Lock()
keys, _ := tx.UnsafeRange(keyBucketName, last, end, int64(s.cfg.CompactionBatchLimit))
for _, key := range keys {
rev = bytesToRev(key)
if _, ok := keep[rev]; !ok {
tx.UnsafeDelete(keyBucketName, key)
keyCompactions++
}
}
if len(keys) < s.cfg.CompactionBatchLimit {
rbytes := make([]byte, 8+1+8)
revToBytes(revision{main: compactMainRev}, rbytes)
tx.UnsafePut(metaBucketName, finishedCompactKeyName, rbytes)
tx.Unlock()
if s.lg != nil {
s.lg.Info(
"finished scheduled compaction",
zap.Int64("compact-revision", compactMainRev),
zap.Duration("took", time.Since(totalStart)),
)
} else {
plog.Infof("finished scheduled compaction at %d (took %v)", compactMainRev, time.Since(totalStart))
}
return true
}
// update last
revToBytes(revision{main: rev.main, sub: rev.sub + 1}, last)
tx.Unlock()
// Immediately commit the compaction deletes instead of letting them accumulate in the write buffer
s.b.ForceCommit()
dbCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
select {
case <-time.After(10 * time.Millisecond):
case <-s.stopc:
return false
}
}
}