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Iwasaki Yudai
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Jun 21, 2017
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // 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 compactor | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/jonboulle/clockwork" | ||
| "golang.org/x/net/context" | ||
|
|
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| pb "github.com/coreos/etcd/etcdserver/etcdserverpb" | ||
| "github.com/coreos/etcd/mvcc" | ||
| ) | ||
|
|
||
| // Periodic compacts the log by purging revisions older than | ||
| // the configured retention time. Compaction happens hourly. | ||
| type Periodic struct { | ||
| clock clockwork.Clock | ||
| periodInHour int | ||
|
|
||
| rg RevGetter | ||
| c Compactable | ||
|
|
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| revs []int64 | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
|
|
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| mu sync.Mutex | ||
| paused bool | ||
| } | ||
|
|
||
| // NewPeriodic creates a new instance of Periodic compactor that purges | ||
| // the log older than h hours. | ||
| func NewPeriodic(h int, rg RevGetter, c Compactable) *Periodic { | ||
| return &Periodic{ | ||
| clock: clockwork.NewRealClock(), | ||
| periodInHour: h, | ||
| rg: rg, | ||
| c: c, | ||
| } | ||
| } | ||
|
|
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| func (t *Periodic) Run() { | ||
| t.ctx, t.cancel = context.WithCancel(context.Background()) | ||
| t.revs = make([]int64, 0) | ||
| clock := t.clock | ||
|
|
||
| go func() { | ||
| last := clock.Now() | ||
| for { | ||
| t.revs = append(t.revs, t.rg.Rev()) | ||
| select { | ||
| case <-t.ctx.Done(): | ||
| return | ||
| case <-clock.After(checkCompactionInterval): | ||
| t.mu.Lock() | ||
| p := t.paused | ||
| t.mu.Unlock() | ||
| if p { | ||
| continue | ||
| } | ||
| } | ||
|
|
||
| if clock.Now().Sub(last) < executeCompactionInterval { | ||
| continue | ||
| } | ||
|
|
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| rev, remaining := t.getRev(t.periodInHour) | ||
| if rev < 0 { | ||
| continue | ||
| } | ||
|
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| plog.Noticef("Starting auto-compaction at revision %d (retention: %d hours)", rev, t.periodInHour) | ||
| _, err := t.c.Compact(t.ctx, &pb.CompactionRequest{Revision: rev}) | ||
| if err == nil || err == mvcc.ErrCompacted { | ||
| t.revs = remaining | ||
| last = clock.Now() | ||
| plog.Noticef("Finished auto-compaction at revision %d", rev) | ||
| } else { | ||
| plog.Noticef("Failed auto-compaction at revision %d (%v)", err, rev) | ||
| plog.Noticef("Retry after %v", checkCompactionInterval) | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func (t *Periodic) Stop() { | ||
| t.cancel() | ||
| } | ||
|
|
||
| func (t *Periodic) Pause() { | ||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
| t.paused = true | ||
| } | ||
|
|
||
| func (t *Periodic) Resume() { | ||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
| t.paused = false | ||
| } | ||
|
|
||
| func (t *Periodic) getRev(h int) (int64, []int64) { | ||
| i := len(t.revs) - int(time.Duration(h)*time.Hour/checkCompactionInterval) | ||
| if i < 0 { | ||
| return -1, t.revs | ||
| } | ||
| return t.revs[i], t.revs[i+1:] | ||
| } |
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