mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
107 lines
2.5 KiB
Go
107 lines
2.5 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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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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// Revision compacts the log by purging revisions older than
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// the configured reivison number. Compaction happens every 5 minutes.
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type Revision struct {
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clock clockwork.Clock
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retention int64
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rg RevGetter
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c Compactable
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ctx context.Context
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cancel context.CancelFunc
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mu sync.Mutex
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paused bool
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}
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// NewRevision creates a new instance of Revisonal compactor that purges
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// the log older than retention revisions from the current revision.
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func NewRevision(retention int64, rg RevGetter, c Compactable) *Revision {
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return &Revision{
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clock: clockwork.NewRealClock(),
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retention: retention,
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rg: rg,
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c: c,
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}
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}
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func (t *Revision) Run() {
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t.ctx, t.cancel = context.WithCancel(context.Background())
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clock := t.clock
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previous := int64(0)
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go func() {
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for {
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select {
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case <-t.ctx.Done():
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return
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case <-clock.After(checkCompactionInterval):
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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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rev := t.rg.Rev() - t.retention
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if rev <= 0 || rev == previous {
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continue
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}
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plog.Noticef("Starting auto-compaction at revision %d (retention: %d revisions)", rev, t.retention)
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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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previous = rev
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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)", err, rev)
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plog.Noticef("Retry after %v", checkCompactionInterval)
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}
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}
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}()
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}
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func (t *Revision) Stop() {
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t.cancel()
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}
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func (t *Revision) 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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func (t *Revision) 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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