add bolt compaction sleep interval

server/config/config.go

@@ -114,6 +114,7 @@ type ServerConfig struct {
 	AutoCompactionRetention time.Duration
 	AutoCompactionMode      string
 	CompactionBatchLimit    int
+	CompactionSleepInterval time.Duration
 	QuotaBackendBytes       int64
 	MaxTxnOps               uint
 

server/embed/config.go

@@ -315,8 +315,10 @@ type Config struct {
 	// TODO: Delete in v3.6 (https://github.com/etcd-io/etcd/issues/12913)
 	ExperimentalEnableV2V3 string `json:"experimental-enable-v2v3"`
 	// ExperimentalEnableLeaseCheckpoint enables primary lessor to persist lease remainingTTL to prevent indefinite auto-renewal of long lived leases.
-	ExperimentalEnableLeaseCheckpoint       bool          `json:"experimental-enable-lease-checkpoint"`
-	ExperimentalCompactionBatchLimit        int           `json:"experimental-compaction-batch-limit"`
+	ExperimentalEnableLeaseCheckpoint bool `json:"experimental-enable-lease-checkpoint"`
+	ExperimentalCompactionBatchLimit  int  `json:"experimental-compaction-batch-limit"`
+	// ExperimentalCompactionSleepInterval is the sleep interval between every etcd compaction loop.
+	ExperimentalCompactionSleepInterval     time.Duration `json:"experimental-compaction-sleep-interval"`
 	ExperimentalWatchProgressNotifyInterval time.Duration `json:"experimental-watch-progress-notify-interval"`
 	// ExperimentalWarningApplyDuration is the time duration after which a warning is generated if applying request
 	// takes more time than this value.

server/embed/etcd.go

@@ -217,6 +217,7 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 		UnsafeNoFsync:                            cfg.UnsafeNoFsync,
 		EnableLeaseCheckpoint:                    cfg.ExperimentalEnableLeaseCheckpoint,
 		CompactionBatchLimit:                     cfg.ExperimentalCompactionBatchLimit,
+		CompactionSleepInterval:                  cfg.ExperimentalCompactionSleepInterval,
 		WatchProgressNotifyInterval:              cfg.ExperimentalWatchProgressNotifyInterval,
 		DowngradeCheckTime:                       cfg.ExperimentalDowngradeCheckTime,
 		WarningApplyDuration:                     cfg.ExperimentalWarningApplyDuration,

server/etcdmain/config.go

@@ -282,6 +282,7 @@ func newConfig() *config {
 
 	fs.BoolVar(&cfg.ec.ExperimentalEnableLeaseCheckpoint, "experimental-enable-lease-checkpoint", false, "Enable to persist lease remaining TTL to prevent indefinite auto-renewal of long lived leases.")
 	fs.IntVar(&cfg.ec.ExperimentalCompactionBatchLimit, "experimental-compaction-batch-limit", cfg.ec.ExperimentalCompactionBatchLimit, "Sets the maximum revisions deleted in each compaction batch.")
+	fs.DurationVar(&cfg.ec.ExperimentalCompactionSleepInterval, "experimental-compaction-sleep-interval", cfg.ec.ExperimentalCompactionSleepInterval, "Sets the sleep interval between each compaction batch.")
 	fs.DurationVar(&cfg.ec.ExperimentalWatchProgressNotifyInterval, "experimental-watch-progress-notify-interval", cfg.ec.ExperimentalWatchProgressNotifyInterval, "Duration of periodic watch progress notifications.")
 	fs.DurationVar(&cfg.ec.ExperimentalDowngradeCheckTime, "experimental-downgrade-check-time", cfg.ec.ExperimentalDowngradeCheckTime, "Duration of time between two downgrade status check.")
 	fs.DurationVar(&cfg.ec.ExperimentalWarningApplyDuration, "experimental-warning-apply-duration", cfg.ec.ExperimentalWarningApplyDuration, "Time duration after which a warning is generated if request takes more time.")

server/etcdserver/server.go

@@ -608,10 +608,16 @@ func NewServer(cfg config.ServerConfig) (srv *EtcdServer, err error) {
 		cfg.Logger.Warn("failed to create token provider", zap.Error(err))
 		return nil, err
 	}
-	srv.kv = mvcc.New(srv.Logger(), srv.be, srv.lessor, mvcc.StoreConfig{CompactionBatchLimit: cfg.CompactionBatchLimit})
+
+	mvccStoreConfig := mvcc.StoreConfig{
+		CompactionBatchLimit:    cfg.CompactionBatchLimit,
+		CompactionSleepInterval: cfg.CompactionSleepInterval,
+	}
+	srv.kv = mvcc.New(srv.Logger(), srv.be, srv.lessor, mvccStoreConfig)
 
 	kvindex := ci.ConsistentIndex()
 	srv.lg.Debug("restore consistentIndex", zap.Uint64("index", kvindex))
+
 	if beExist {
 		// TODO: remove kvindex != 0 checking when we do not expect users to upgrade
 		// etcd from pre-3.0 release.

server/mvcc/kvstore.go

@@ -52,9 +52,11 @@ const (
 
 var restoreChunkKeys = 10000 // non-const for testing
 var defaultCompactBatchLimit = 1000
+var minimumBatchInterval = 10 * time.Millisecond
 
 type StoreConfig struct {
-	CompactionBatchLimit int
+	CompactionBatchLimit    int
+	CompactionSleepInterval time.Duration
 }
 
 type store struct {
@@ -96,6 +98,9 @@ func NewStore(lg *zap.Logger, b backend.Backend, le lease.Lessor, cfg StoreConfi
 	if cfg.CompactionBatchLimit == 0 {
 		cfg.CompactionBatchLimit = defaultCompactBatchLimit
 	}
+	if cfg.CompactionSleepInterval == 0 {
+		cfg.CompactionSleepInterval = minimumBatchInterval
+	}
 	s := &store{
 		cfg:     cfg,
 		b:       b,

server/mvcc/kvstore_compaction.go

@@ -32,6 +32,9 @@ func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struc
 	end := make([]byte, 8)
 	binary.BigEndian.PutUint64(end, uint64(compactMainRev+1))
 
+	batchNum := s.cfg.CompactionBatchLimit
+	batchInterval := s.cfg.CompactionSleepInterval
+
 	last := make([]byte, 8+1+8)
 	for {
 		var rev revision
@@ -40,7 +43,7 @@ func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struc
 
 		tx := s.b.BatchTx()
 		tx.Lock()
-		keys, _ := tx.UnsafeRange(buckets.Key, last, end, int64(s.cfg.CompactionBatchLimit))
+		keys, _ := tx.UnsafeRange(buckets.Key, last, end, int64(batchNum))
 		for _, key := range keys {
 			rev = bytesToRev(key)
 			if _, ok := keep[rev]; !ok {
@@ -49,7 +52,7 @@ func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struc
 			}
 		}
 
-		if len(keys) < s.cfg.CompactionBatchLimit {
+		if len(keys) < batchNum {
 			rbytes := make([]byte, 8+1+8)
 			revToBytes(revision{main: compactMainRev}, rbytes)
 			tx.UnsafePut(buckets.Meta, finishedCompactKeyName, rbytes)
@@ -70,7 +73,7 @@ func (s *store) scheduleCompaction(compactMainRev int64, keep map[revision]struc
 		dbCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
 
 		select {
-		case <-time.After(10 * time.Millisecond):
+		case <-time.After(batchInterval):
 		case <-s.stopc:
 			return false
 		}