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// Copyright 2017 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 v3compactor
import (
"context"
"sync"
"time"
pb "go.etcd.io/etcd/api/v3/etcdserverpb"
"go.etcd.io/etcd/server/v3/mvcc"
"github.com/jonboulle/clockwork"
"go.uber.org/zap"
)
// Revision compacts the log by purging revisions older than
// the configured reivison number. Compaction happens every 5 minutes.
type Revision struct {
lg *zap.Logger
clock clockwork.Clock
retention int64
rg RevGetter
c Compactable
ctx context.Context
cancel context.CancelFunc
mu sync.Mutex
paused bool
}
// newRevision creates a new instance of Revisonal compactor that purges
// the log older than retention revisions from the current revision.
func newRevision(lg *zap.Logger, clock clockwork.Clock, retention int64, rg RevGetter, c Compactable) *Revision {
rc := &Revision{
lg: lg,
clock: clock,
retention: retention,
rg: rg,
c: c,
}
rc.ctx, rc.cancel = context.WithCancel(context.Background())
return rc
}
const revInterval = 5 * time.Minute
// Run runs revision-based compactor.
func (rc *Revision) Run() {
prev := int64(0)
go func() {
for {
select {
case <-rc.ctx.Done():
return
case <-rc.clock.After(revInterval):
rc.mu.Lock()
p := rc.paused
rc.mu.Unlock()
if p {
continue
}
}
rev := rc.rg.Rev() - rc.retention
if rev <= 0 || rev == prev {
continue
}
now := time.Now()
rc.lg.Info(
"starting auto revision compaction",
zap.Int64("revision", rev),
zap.Int64("revision-compaction-retention", rc.retention),
)
_, err := rc.c.Compact(rc.ctx, &pb.CompactionRequest{Revision: rev})
if err == nil || err == mvcc.ErrCompacted {
prev = rev
rc.lg.Info(
"completed auto revision compaction",
zap.Int64("revision", rev),
zap.Int64("revision-compaction-retention", rc.retention),
zap.Duration("took", time.Since(now)),
)
} else {
rc.lg.Warn(
"failed auto revision compaction",
zap.Int64("revision", rev),
zap.Int64("revision-compaction-retention", rc.retention),
zap.Duration("retry-interval", revInterval),
zap.Error(err),
)
}
}
}()
}
// Stop stops revision-based compactor.
func (rc *Revision) Stop() {
rc.cancel()
}
// Pause pauses revision-based compactor.
func (rc *Revision) Pause() {
rc.mu.Lock()
rc.paused = true
rc.mu.Unlock()
}
// Resume resumes revision-based compactor.
func (rc *Revision) Resume() {
rc.mu.Lock()
rc.paused = false
rc.mu.Unlock()
}
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