diff --git a/vendor/go.etcd.io/etcd/etcdserver/api/v3compactor/periodic.go b/vendor/go.etcd.io/etcd/etcdserver/api/v3compactor/periodic.go
new file mode 100644
index 0000000..ab64cb7
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/etcdserver/api/v3compactor/periodic.go
@@ -0,0 +1,217 @@
+// 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/etcdserver/etcdserverpb"
+	"go.etcd.io/etcd/mvcc"
+
+	"github.com/jonboulle/clockwork"
+	"go.uber.org/zap"
+)
+
+// Periodic compacts the log by purging revisions older than
+// the configured retention time.
+type Periodic struct {
+	lg     *zap.Logger
+	clock  clockwork.Clock
+	period time.Duration
+
+	rg RevGetter
+	c  Compactable
+
+	revs   []int64
+	ctx    context.Context
+	cancel context.CancelFunc
+
+	// mu protects paused
+	mu     sync.RWMutex
+	paused bool
+}
+
+// newPeriodic creates a new instance of Periodic compactor that purges
+// the log older than h Duration.
+func newPeriodic(lg *zap.Logger, clock clockwork.Clock, h time.Duration, rg RevGetter, c Compactable) *Periodic {
+	pc := &Periodic{
+		lg:     lg,
+		clock:  clock,
+		period: h,
+		rg:     rg,
+		c:      c,
+		revs:   make([]int64, 0),
+	}
+	pc.ctx, pc.cancel = context.WithCancel(context.Background())
+	return pc
+}
+
+/*
+Compaction period 1-hour:
+  1. compute compaction period, which is 1-hour
+  2. record revisions for every 1/10 of 1-hour (6-minute)
+  3. keep recording revisions with no compaction for first 1-hour
+  4. do compact with revs[0]
+	- success? contiue on for-loop and move sliding window; revs = revs[1:]
+	- failure? update revs, and retry after 1/10 of 1-hour (6-minute)
+
+Compaction period 24-hour:
+  1. compute compaction period, which is 1-hour
+  2. record revisions for every 1/10 of 1-hour (6-minute)
+  3. keep recording revisions with no compaction for first 24-hour
+  4. do compact with revs[0]
+	- success? contiue on for-loop and move sliding window; revs = revs[1:]
+	- failure? update revs, and retry after 1/10 of 1-hour (6-minute)
+
+Compaction period 59-min:
+  1. compute compaction period, which is 59-min
+  2. record revisions for every 1/10 of 59-min (5.9-min)
+  3. keep recording revisions with no compaction for first 59-min
+  4. do compact with revs[0]
+	- success? contiue on for-loop and move sliding window; revs = revs[1:]
+	- failure? update revs, and retry after 1/10 of 59-min (5.9-min)
+
+Compaction period 5-sec:
+  1. compute compaction period, which is 5-sec
+  2. record revisions for every 1/10 of 5-sec (0.5-sec)
+  3. keep recording revisions with no compaction for first 5-sec
+  4. do compact with revs[0]
+	- success? contiue on for-loop and move sliding window; revs = revs[1:]
+	- failure? update revs, and retry after 1/10 of 5-sec (0.5-sec)
+*/
+
+// Run runs periodic compactor.
+func (pc *Periodic) Run() {
+	compactInterval := pc.getCompactInterval()
+	retryInterval := pc.getRetryInterval()
+	retentions := pc.getRetentions()
+
+	go func() {
+		lastSuccess := pc.clock.Now()
+		baseInterval := pc.period
+		for {
+			pc.revs = append(pc.revs, pc.rg.Rev())
+			if len(pc.revs) > retentions {
+				pc.revs = pc.revs[1:] // pc.revs[0] is always the rev at pc.period ago
+			}
+
+			select {
+			case <-pc.ctx.Done():
+				return
+			case <-pc.clock.After(retryInterval):
+				pc.mu.Lock()
+				p := pc.paused
+				pc.mu.Unlock()
+				if p {
+					continue
+				}
+			}
+
+			if pc.clock.Now().Sub(lastSuccess) < baseInterval {
+				continue
+			}
+
+			// wait up to initial given period
+			if baseInterval == pc.period {
+				baseInterval = compactInterval
+			}
+			rev := pc.revs[0]
+
+			if pc.lg != nil {
+				pc.lg.Info(
+					"starting auto periodic compaction",
+					zap.Int64("revision", rev),
+					zap.Duration("compact-period", pc.period),
+				)
+			} else {
+				plog.Noticef("Starting auto-compaction at revision %d (retention: %v)", rev, pc.period)
+			}
+			_, err := pc.c.Compact(pc.ctx, &pb.CompactionRequest{Revision: rev})
+			if err == nil || err == mvcc.ErrCompacted {
+				if pc.lg != nil {
+					pc.lg.Info(
+						"completed auto periodic compaction",
+						zap.Int64("revision", rev),
+						zap.Duration("compact-period", pc.period),
+						zap.Duration("took", time.Since(lastSuccess)),
+					)
+				} else {
+					plog.Noticef("Finished auto-compaction at revision %d", rev)
+				}
+				lastSuccess = pc.clock.Now()
+			} else {
+				if pc.lg != nil {
+					pc.lg.Warn(
+						"failed auto periodic compaction",
+						zap.Int64("revision", rev),
+						zap.Duration("compact-period", pc.period),
+						zap.Duration("retry-interval", retryInterval),
+						zap.Error(err),
+					)
+				} else {
+					plog.Noticef("Failed auto-compaction at revision %d (%v)", rev, err)
+					plog.Noticef("Retry after %v", retryInterval)
+				}
+			}
+		}
+	}()
+}
+
+// if given compaction period x is <1-hour, compact every x duration.
+// (e.g. --auto-compaction-mode 'periodic' --auto-compaction-retention='10m', then compact every 10-minute)
+// if given compaction period x is >1-hour, compact every hour.
+// (e.g. --auto-compaction-mode 'periodic' --auto-compaction-retention='2h', then compact every 1-hour)
+func (pc *Periodic) getCompactInterval() time.Duration {
+	itv := pc.period
+	if itv > time.Hour {
+		itv = time.Hour
+	}
+	return itv
+}
+
+func (pc *Periodic) getRetentions() int {
+	return int(pc.period/pc.getRetryInterval()) + 1
+}
+
+const retryDivisor = 10
+
+func (pc *Periodic) getRetryInterval() time.Duration {
+	itv := pc.period
+	if itv > time.Hour {
+		itv = time.Hour
+	}
+	return itv / retryDivisor
+}
+
+// Stop stops periodic compactor.
+func (pc *Periodic) Stop() {
+	pc.cancel()
+}
+
+// Pause pauses periodic compactor.
+func (pc *Periodic) Pause() {
+	pc.mu.Lock()
+	pc.paused = true
+	pc.mu.Unlock()
+}
+
+// Resume resumes periodic compactor.
+func (pc *Periodic) Resume() {
+	pc.mu.Lock()
+	pc.paused = false
+	pc.mu.Unlock()
+}