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https://github.com/etcd-io/etcd.git
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21bbc82710
scheduleCompaction function To improve traceability of backend database usage, Added below parameter related to backend database usage metrics inside scheduledCompaction function. current-db-size-bytes current-db-size current-db-size-in-use-bytes current-db-size-in-use Signed-off-by: Rahul More <rahulbapumore@gmail.com>
100 lines
3.2 KiB
Go
100 lines
3.2 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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"fmt"
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"time"
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humanize "github.com/dustin/go-humanize"
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"go.uber.org/zap"
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"go.etcd.io/etcd/server/v3/storage/schema"
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)
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func (s *store) scheduleCompaction(compactMainRev, prevCompactRev int64) (KeyValueHash, error) {
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totalStart := time.Now()
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keep := s.kvindex.Compact(compactMainRev)
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indexCompactionPauseMs.Observe(float64(time.Since(totalStart) / time.Millisecond))
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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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batchNum := s.cfg.CompactionBatchLimit
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batchTicker := time.NewTicker(s.cfg.CompactionSleepInterval)
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defer batchTicker.Stop()
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h := newKVHasher(prevCompactRev, compactMainRev, keep)
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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.LockOutsideApply()
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keys, values := tx.UnsafeRange(schema.Key, last, end, int64(batchNum))
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for i := range keys {
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rev = BytesToRev(keys[i])
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if _, ok := keep[rev]; !ok {
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tx.UnsafeDelete(schema.Key, keys[i])
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keyCompactions++
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}
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h.WriteKeyValue(keys[i], values[i])
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}
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if len(keys) < batchNum {
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// gofail: var compactBeforeSetFinishedCompact struct{}
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UnsafeSetFinishedCompact(tx, compactMainRev)
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tx.Unlock()
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// gofail: var compactAfterSetFinishedCompact struct{}
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hash := h.Hash()
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size, sizeInUse := s.b.Size(), s.b.SizeInUse()
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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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zap.Uint32("hash", hash.Hash),
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zap.Int64("current-db-size-bytes", size),
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zap.String("current-db-size", humanize.Bytes(uint64(size))),
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zap.Int64("current-db-size-in-use-bytes", sizeInUse),
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zap.String("current-db-size-in-use", humanize.Bytes(uint64(sizeInUse))),
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)
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return hash, nil
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}
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tx.Unlock()
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// update last
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last = RevToBytes(Revision{Main: rev.Main, Sub: rev.Sub + 1}, last)
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// Immediately commit the compaction deletes instead of letting them accumulate in the write buffer
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// gofail: var compactBeforeCommitBatch struct{}
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s.b.ForceCommit()
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// gofail: var compactAfterCommitBatch struct{}
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dbCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
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select {
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case <-batchTicker.C:
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case <-s.stopc:
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return KeyValueHash{}, fmt.Errorf("interrupted due to stop signal")
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}
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}
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}
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