136 lines
3.1 KiB
Go
136 lines
3.1 KiB
Go
// Copyright 2017 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 compactor
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import (
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"context"
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"sync"
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"time"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/mvcc"
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"github.com/jonboulle/clockwork"
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)
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// Periodic compacts the log by purging revisions older than
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// the configured retention time.
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type Periodic struct {
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clock clockwork.Clock
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period time.Duration
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rg RevGetter
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c Compactable
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revs []int64
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ctx context.Context
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cancel context.CancelFunc
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// mu protects paused
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mu sync.RWMutex
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paused bool
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}
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// NewPeriodic creates a new instance of Periodic compactor that purges
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// the log older than h Duration.
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func NewPeriodic(h time.Duration, rg RevGetter, c Compactable) *Periodic {
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return newPeriodic(clockwork.NewRealClock(), h, rg, c)
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}
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func newPeriodic(clock clockwork.Clock, h time.Duration, rg RevGetter, c Compactable) *Periodic {
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t := &Periodic{
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clock: clock,
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period: h,
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rg: rg,
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c: c,
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revs: make([]int64, 0),
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}
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t.ctx, t.cancel = context.WithCancel(context.Background())
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return t
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}
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// periodDivisor divides Periodic.period in into checkCompactInterval duration
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const periodDivisor = 10
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// Run runs periodic compactor.
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func (t *Periodic) Run() {
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interval := t.period / time.Duration(periodDivisor)
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go func() {
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initialWait := t.clock.Now()
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for {
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t.revs = append(t.revs, t.rg.Rev())
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select {
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case <-t.ctx.Done():
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return
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case <-t.clock.After(interval):
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t.mu.Lock()
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p := t.paused
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t.mu.Unlock()
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if p {
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continue
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}
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}
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// wait up to initial given period
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if t.clock.Now().Sub(initialWait) < t.period {
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continue
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}
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rev, remaining := t.getRev()
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if rev < 0 {
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continue
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}
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plog.Noticef("Starting auto-compaction at revision %d (retention: %v)", rev, t.period)
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_, err := t.c.Compact(t.ctx, &pb.CompactionRequest{Revision: rev})
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if err == nil || err == mvcc.ErrCompacted {
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// move to next sliding window
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t.revs = remaining
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plog.Noticef("Finished auto-compaction at revision %d", rev)
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} else {
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plog.Noticef("Failed auto-compaction at revision %d (%v)", rev, err)
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plog.Noticef("Retry after %v", interval)
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}
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}
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}()
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}
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// Stop stops periodic compactor.
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func (t *Periodic) Stop() {
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t.cancel()
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}
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// Pause pauses periodic compactor.
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func (t *Periodic) Pause() {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.paused = true
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}
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// Resume resumes periodic compactor.
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func (t *Periodic) Resume() {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.paused = false
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}
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func (t *Periodic) getRev() (int64, []int64) {
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i := len(t.revs) - periodDivisor
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if i < 0 {
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return -1, t.revs
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}
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return t.revs[i], t.revs[i+1:]
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}
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