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https://github.com/etcd-io/etcd.git
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865df75714
This makes (bbolt) backend a full feature snapshot in term of WAL/raft, i.e. carries: - commit : (applied_index) - confState Benefits: - Backend will be a sufficient point in time definition sufficient to start replaying WAL. We have applied_index & confState in consistent state. - In case of emergency a backend state can be used for recovery
78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mvcc
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import (
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"encoding/binary"
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"time"
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"go.uber.org/zap"
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)
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func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struct{}) bool {
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totalStart := time.Now()
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defer func() { dbCompactionTotalMs.Observe(float64(time.Since(totalStart) / time.Millisecond)) }()
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keyCompactions := 0
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defer func() { dbCompactionKeysCounter.Add(float64(keyCompactions)) }()
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defer func() { dbCompactionLast.Set(float64(time.Now().Unix())) }()
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end := make([]byte, 8)
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binary.BigEndian.PutUint64(end, uint64(compactMainRev+1))
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last := make([]byte, 8+1+8)
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for {
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var rev revision
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start := time.Now()
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tx := s.b.BatchTx()
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tx.Lock()
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keys, _ := tx.UnsafeRange(keyBucketName, last, end, int64(s.cfg.CompactionBatchLimit))
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for _, key := range keys {
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rev = bytesToRev(key)
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if _, ok := keep[rev]; !ok {
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tx.UnsafeDelete(keyBucketName, key)
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keyCompactions++
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}
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}
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if len(keys) < s.cfg.CompactionBatchLimit {
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rbytes := make([]byte, 8+1+8)
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revToBytes(revision{main: compactMainRev}, rbytes)
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tx.UnsafePut(MetaBucketName, finishedCompactKeyName, rbytes)
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tx.Unlock()
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s.lg.Info(
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"finished scheduled compaction",
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zap.Int64("compact-revision", compactMainRev),
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zap.Duration("took", time.Since(totalStart)),
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)
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return true
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}
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// update last
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revToBytes(revision{main: rev.main, sub: rev.sub + 1}, last)
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tx.Unlock()
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// Immediately commit the compaction deletes instead of letting them accumulate in the write buffer
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s.b.ForceCommit()
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dbCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
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select {
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case <-time.After(10 * time.Millisecond):
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case <-s.stopc:
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return false
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}
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}
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}
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