[3.4] Checkpoints fix 3.4

clientv3/snapshot/v3_snapshot.go

@@ -391,7 +391,7 @@ func (s *v3Manager) saveDB() error {
 	be := backend.NewDefaultBackend(dbpath)
 
 	// a lessor never timeouts leases
-	lessor := lease.NewLessor(s.lg, be, lease.LessorConfig{MinLeaseTTL: math.MaxInt64})
+	lessor := lease.NewLessor(s.lg, be, nil, lease.LessorConfig{MinLeaseTTL: math.MaxInt64})
 
 	mvs := mvcc.NewStore(s.lg, be, lessor, (*initIndex)(&commit), mvcc.StoreConfig{CompactionBatchLimit: math.MaxInt32})
 	txn := mvs.Write(traceutil.TODO())

embed/config.go

@@ -288,10 +288,15 @@ type Config struct {
 	ExperimentalEnableV2V3          string        `json:"experimental-enable-v2v3"`
 	// ExperimentalBackendFreelistType specifies the type of freelist that boltdb backend uses (array and map are supported types).
 	ExperimentalBackendFreelistType string `json:"experimental-backend-bbolt-freelist-type"`
-	// 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"`
-	ExperimentalWatchProgressNotifyInterval time.Duration `json:"experimental-watch-progress-notify-interval"`
+	// ExperimentalEnableLeaseCheckpoint enables leader to send regular checkpoints to other members to prevent reset of remaining TTL on leader change.
+	ExperimentalEnableLeaseCheckpoint bool `json:"experimental-enable-lease-checkpoint"`
+	// ExperimentalEnableLeaseCheckpointPersist enables persisting remainingTTL to prevent indefinite auto-renewal of long lived leases. Always enabled in v3.6. Should be used to ensure smooth upgrade from v3.5 clusters with this feature enabled.
+	// Requires experimental-enable-lease-checkpoint to be enabled.
+	// Deprecated in v3.6.
+	// TODO: Delete in v3.7
+	ExperimentalEnableLeaseCheckpointPersist bool          `json:"experimental-enable-lease-checkpoint-persist"`
+	ExperimentalCompactionBatchLimit         int           `json:"experimental-compaction-batch-limit"`
+	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.
 	ExperimentalWarningApplyDuration time.Duration `json:"experimental-warning-apply-duration"`
@@ -637,6 +642,14 @@ func (cfg *Config) Validate() error {
 		return fmt.Errorf("unknown auto-compaction-mode %q", cfg.AutoCompactionMode)
 	}
 
+	if !cfg.ExperimentalEnableLeaseCheckpointPersist && cfg.ExperimentalEnableLeaseCheckpoint {
+		cfg.logger.Warn("Detected that checkpointing is enabled without persistence. Consider enabling experimental-enable-lease-checkpoint-persist")
+	}
+
+	if cfg.ExperimentalEnableLeaseCheckpointPersist && !cfg.ExperimentalEnableLeaseCheckpoint {
+		return fmt.Errorf("setting experimental-enable-lease-checkpoint-persist requires experimental-enable-lease-checkpoint")
+	}
+
 	return nil
 }
 

embed/etcd.go

@@ -208,6 +208,7 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 		EnableGRPCGateway:           cfg.EnableGRPCGateway,
 		UnsafeNoFsync:               cfg.UnsafeNoFsync,
 		EnableLeaseCheckpoint:       cfg.ExperimentalEnableLeaseCheckpoint,
+		LeaseCheckpointPersist:      cfg.ExperimentalEnableLeaseCheckpointPersist,
 		CompactionBatchLimit:        cfg.ExperimentalCompactionBatchLimit,
 		WatchProgressNotifyInterval: cfg.ExperimentalWatchProgressNotifyInterval,
 		WarningApplyDuration:        cfg.ExperimentalWarningApplyDuration,

etcdmain/config.go

@@ -257,7 +257,9 @@ func newConfig() *config {
 	fs.DurationVar(&cfg.ec.ExperimentalCorruptCheckTime, "experimental-corrupt-check-time", cfg.ec.ExperimentalCorruptCheckTime, "Duration of time between cluster corruption check passes.")
 	fs.StringVar(&cfg.ec.ExperimentalEnableV2V3, "experimental-enable-v2v3", cfg.ec.ExperimentalEnableV2V3, "v3 prefix for serving emulated v2 state.")
 	fs.StringVar(&cfg.ec.ExperimentalBackendFreelistType, "experimental-backend-bbolt-freelist-type", cfg.ec.ExperimentalBackendFreelistType, "ExperimentalBackendFreelistType specifies the type of freelist that boltdb backend uses(array and map are supported types)")
-	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.BoolVar(&cfg.ec.ExperimentalEnableLeaseCheckpoint, "experimental-enable-lease-checkpoint", false, "Enable leader to send regular checkpoints to other members to prevent reset of remaining TTL on leader change.")
+	// TODO: delete in v3.7
+	fs.BoolVar(&cfg.ec.ExperimentalEnableLeaseCheckpointPersist, "experimental-enable-lease-checkpoint-persist", false, "Enable persisting remainingTTL to prevent indefinite auto-renewal of long lived leases. Always enabled in v3.6. Should be used to ensure smooth upgrade from v3.5 clusters with this feature enabled. Requires experimental-enable-lease-checkpoint to be enabled.")
 	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.ExperimentalWatchProgressNotifyInterval, "experimental-watch-progress-notify-interval", cfg.ec.ExperimentalWatchProgressNotifyInterval, "Duration of periodic watch progress notifications.")
 	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.")

etcdserver/config.go

@@ -158,10 +158,12 @@ type ServerConfig struct {
 
 	ForceNewCluster bool
 
-	// EnableLeaseCheckpoint enables primary lessor to persist lease remainingTTL to prevent indefinite auto-renewal of long lived leases.
+	// EnableLeaseCheckpoint enables leader to send regular checkpoints to other members to prevent reset of remaining TTL on leader change.
 	EnableLeaseCheckpoint bool
 	// LeaseCheckpointInterval time.Duration is the wait duration between lease checkpoints.
 	LeaseCheckpointInterval time.Duration
+	// LeaseCheckpointPersist enables persisting remainingTTL to prevent indefinite auto-renewal of long lived leases. Always enabled in v3.6. Should be used to ensure smooth upgrade from v3.5 clusters with this feature enabled.
+	LeaseCheckpointPersist bool
 
 	EnableGRPCGateway bool
 

etcdserver/server.go

@@ -543,9 +543,11 @@ func NewServer(cfg ServerConfig) (srv *EtcdServer, err error) {
 	srv.lessor = lease.NewLessor(
 		srv.getLogger(),
 		srv.be,
+		srv.cluster,
 		lease.LessorConfig{
 			MinLeaseTTL:                int64(math.Ceil(minTTL.Seconds())),
 			CheckpointInterval:         cfg.LeaseCheckpointInterval,
+			CheckpointPersist:          cfg.LeaseCheckpointPersist,
 			ExpiredLeasesRetryInterval: srv.Cfg.ReqTimeout(),
 		})
 

integration/cluster.go

@@ -152,6 +152,7 @@ type ClusterConfig struct {
 
 	EnableLeaseCheckpoint   bool
 	LeaseCheckpointInterval time.Duration
+	LeaseCheckpointPersist  bool
 
 	WatchProgressNotifyInterval time.Duration
 	CorruptCheckTime            time.Duration
@@ -298,6 +299,7 @@ func (c *cluster) mustNewMember(t testing.TB) *member {
 			clientMaxCallRecvMsgSize:    c.cfg.ClientMaxCallRecvMsgSize,
 			useIP:                       c.cfg.UseIP,
 			enableLeaseCheckpoint:       c.cfg.EnableLeaseCheckpoint,
+			leaseCheckpointPersist:      c.cfg.LeaseCheckpointPersist,
 			leaseCheckpointInterval:     c.cfg.LeaseCheckpointInterval,
 			WatchProgressNotifyInterval: c.cfg.WatchProgressNotifyInterval,
 			CorruptCheckTime:            c.cfg.CorruptCheckTime,
@@ -590,6 +592,7 @@ type memberConfig struct {
 	useIP                       bool
 	enableLeaseCheckpoint       bool
 	leaseCheckpointInterval     time.Duration
+	leaseCheckpointPersist      bool
 	WatchProgressNotifyInterval time.Duration
 	CorruptCheckTime            time.Duration
 }
@@ -684,6 +687,7 @@ func mustNewMember(t testing.TB, mcfg memberConfig) *member {
 	m.useIP = mcfg.useIP
 	m.EnableLeaseCheckpoint = mcfg.enableLeaseCheckpoint
 	m.LeaseCheckpointInterval = mcfg.leaseCheckpointInterval
+	m.LeaseCheckpointPersist = mcfg.leaseCheckpointPersist
 
 	m.WatchProgressNotifyInterval = mcfg.WatchProgressNotifyInterval
 

integration/v3_lease_test.go

@@ -313,54 +313,121 @@ func TestV3LeaseKeepAlive(t *testing.T) {
 // TestV3LeaseCheckpoint ensures a lease checkpoint results in a remaining TTL being persisted
 // across leader elections.
 func TestV3LeaseCheckpoint(t *testing.T) {
-	var ttl int64 = 300
-	leaseInterval := 2 * time.Second
-	defer testutil.AfterTest(t)
-	clus := NewClusterV3(t, &ClusterConfig{
-		Size:                    3,
-		EnableLeaseCheckpoint:   true,
-		LeaseCheckpointInterval: leaseInterval,
-	})
-	defer clus.Terminate(t)
-
-	// create lease
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	c := toGRPC(clus.RandClient())
-	lresp, err := c.Lease.LeaseGrant(ctx, &pb.LeaseGrantRequest{TTL: ttl})
-	if err != nil {
-		t.Fatal(err)
+	tcs := []struct {
+		name                  string
+		checkpointingEnabled  bool
+		ttl                   time.Duration
+		checkpointingInterval time.Duration
+		checkpointingPersist  bool
+		leaderChanges         int
+		clusterSize           int
+		expectTTLIsGT         time.Duration
+		expectTTLIsLT         time.Duration
+	}{
+		{
+			name:          "Checkpointing disabled, lease TTL is reset",
+			ttl:           300 * time.Second,
+			leaderChanges: 1,
+			clusterSize:   3,
+			expectTTLIsGT: 298 * time.Second,
+		},
+		{
+			name:                  "Checkpointing enabled 10s, lease TTL is preserved after leader change",
+			ttl:                   300 * time.Second,
+			checkpointingEnabled:  true,
+			checkpointingInterval: 10 * time.Second,
+			leaderChanges:         1,
+			clusterSize:           3,
+			expectTTLIsLT:         290 * time.Second,
+		},
+		{
+			name:                  "Checkpointing enabled 10s with persist, lease TTL is preserved after cluster restart",
+			ttl:                   300 * time.Second,
+			checkpointingEnabled:  true,
+			checkpointingInterval: 10 * time.Second,
+			checkpointingPersist:  true,
+			leaderChanges:         1,
+			clusterSize:           1,
+			expectTTLIsLT:         290 * time.Second,
+		},
+		{
+			name:                  "Checkpointing enabled 10s, lease TTL is reset after restart",
+			ttl:                   300 * time.Second,
+			checkpointingEnabled:  true,
+			checkpointingInterval: 10 * time.Second,
+			leaderChanges:         1,
+			clusterSize:           1,
+			expectTTLIsGT:         298 * time.Second,
+		},
+		{
+			// Checking if checkpointing continues after the first leader change.
+			name:                  "Checkpointing enabled 10s, lease TTL is preserved after 2 leader changes",
+			ttl:                   300 * time.Second,
+			checkpointingEnabled:  true,
+			checkpointingInterval: 10 * time.Second,
+			leaderChanges:         2,
+			clusterSize:           3,
+			expectTTLIsLT:         280 * time.Second,
+		},
 	}
+	for _, tc := range tcs {
+		t.Run(tc.name, func(t *testing.T) {
+			config := &ClusterConfig{
+				Size:                    tc.clusterSize,
+				EnableLeaseCheckpoint:   tc.checkpointingEnabled,
+				LeaseCheckpointInterval: tc.checkpointingInterval,
+				LeaseCheckpointPersist:  tc.checkpointingPersist,
+				SnapshotCount:           5,
+			}
+			clus := NewClusterV3(t, config)
+			defer clus.Terminate(t)
+
+			// create lease
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			c := toGRPC(clus.RandClient())
+			lresp, err := c.Lease.LeaseGrant(ctx, &pb.LeaseGrantRequest{TTL: int64(tc.ttl.Seconds())})
+			if err != nil {
+				t.Fatal(err)
+			}
 
-	// wait for a checkpoint to occur
-	time.Sleep(leaseInterval + 1*time.Second)
+			for i := 0; i < tc.leaderChanges; i++ {
+				// wait for a checkpoint to occur
+				time.Sleep(tc.checkpointingInterval + 1*time.Second)
 
-	// Force a leader election
-	leaderId := clus.WaitLeader(t)
-	leader := clus.Members[leaderId]
-	leader.Stop(t)
-	time.Sleep(time.Duration(3*electionTicks) * tickDuration)
-	leader.Restart(t)
-	newLeaderId := clus.WaitLeader(t)
-	c2 := toGRPC(clus.Client(newLeaderId))
+				// Force a leader election
+				leaderId := clus.WaitLeader(t)
+				leader := clus.Members[leaderId]
+				leader.Stop(t)
+				time.Sleep(time.Duration(3*electionTicks) * tickDuration)
+				leader.Restart(t)
+			}
 
-	time.Sleep(250 * time.Millisecond)
+			newLeaderId := clus.WaitLeader(t)
+			c2 := toGRPC(clus.Client(newLeaderId))
 
-	// Check the TTL of the new leader
-	var ttlresp *pb.LeaseTimeToLiveResponse
-	for i := 0; i < 10; i++ {
-		if ttlresp, err = c2.Lease.LeaseTimeToLive(ctx, &pb.LeaseTimeToLiveRequest{ID: lresp.ID}); err != nil {
-			if status, ok := status.FromError(err); ok && status.Code() == codes.Unavailable {
-				time.Sleep(time.Millisecond * 250)
-			} else {
-				t.Fatal(err)
+			time.Sleep(250 * time.Millisecond)
+
+			// Check the TTL of the new leader
+			var ttlresp *pb.LeaseTimeToLiveResponse
+			for i := 0; i < 10; i++ {
+				if ttlresp, err = c2.Lease.LeaseTimeToLive(ctx, &pb.LeaseTimeToLiveRequest{ID: lresp.ID}); err != nil {
+					if status, ok := status.FromError(err); ok && status.Code() == codes.Unavailable {
+						time.Sleep(time.Millisecond * 250)
+					} else {
+						t.Fatal(err)
+					}
+				}
+			}
+
+			if tc.expectTTLIsGT != 0 && time.Duration(ttlresp.TTL)*time.Second <= tc.expectTTLIsGT {
+				t.Errorf("Expected lease ttl (%v) to be greather than (%v)", time.Duration(ttlresp.TTL)*time.Second, tc.expectTTLIsGT)
 			}
-		}
-	}
 
-	expectedTTL := ttl - int64(leaseInterval.Seconds())
-	if ttlresp.TTL < expectedTTL-1 || ttlresp.TTL > expectedTTL {
-		t.Fatalf("expected lease to be checkpointed after restart such that %d < TTL <%d, but got TTL=%d", expectedTTL-1, expectedTTL, ttlresp.TTL)
+			if tc.expectTTLIsLT != 0 && time.Duration(ttlresp.TTL)*time.Second > tc.expectTTLIsLT {
+				t.Errorf("Expected lease ttl (%v) to be lower than (%v)", time.Duration(ttlresp.TTL)*time.Second, tc.expectTTLIsLT)
+			}
+		})
 	}
 }
 

lease/leasehttp/http_test.go

@@ -33,7 +33,7 @@ func TestRenewHTTP(t *testing.T) {
 	defer os.Remove(tmpPath)
 	defer be.Close()
 
-	le := lease.NewLessor(lg, be, lease.LessorConfig{MinLeaseTTL: int64(5)})
+	le := lease.NewLessor(lg, be, nil, lease.LessorConfig{MinLeaseTTL: int64(5)})
 	le.Promote(time.Second)
 	l, err := le.Grant(1, int64(5))
 	if err != nil {
@@ -58,7 +58,7 @@ func TestTimeToLiveHTTP(t *testing.T) {
 	defer os.Remove(tmpPath)
 	defer be.Close()
 
-	le := lease.NewLessor(lg, be, lease.LessorConfig{MinLeaseTTL: int64(5)})
+	le := lease.NewLessor(lg, be, nil, lease.LessorConfig{MinLeaseTTL: int64(5)})
 	le.Promote(time.Second)
 	l, err := le.Grant(1, int64(5))
 	if err != nil {
@@ -100,7 +100,7 @@ func testApplyTimeout(t *testing.T, f func(*lease.Lease, string) error) {
 	defer os.Remove(tmpPath)
 	defer be.Close()
 
-	le := lease.NewLessor(lg, be, lease.LessorConfig{MinLeaseTTL: int64(5)})
+	le := lease.NewLessor(lg, be, nil, lease.LessorConfig{MinLeaseTTL: int64(5)})
 	le.Promote(time.Second)
 	l, err := le.Grant(1, int64(5))
 	if err != nil {