server: Make corrtuption check optional and period configurable

Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>

server/config/config.go

@@ -149,6 +149,8 @@ type ServerConfig struct {
 	// before serving any peer/client traffic.
 	InitialCorruptCheck     bool
 	CorruptCheckTime        time.Duration
+	CompactHashCheckEnabled bool
+	CompactHashCheckTime    time.Duration
 
 	// PreVote is true to enable Raft Pre-Vote.
 	PreVote bool

server/embed/config.go

@@ -322,6 +322,9 @@ type Config struct {
 
 	ExperimentalInitialCorruptCheck     bool          `json:"experimental-initial-corrupt-check"`
 	ExperimentalCorruptCheckTime        time.Duration `json:"experimental-corrupt-check-time"`
+	ExperimentalCompactHashCheckEnabled bool          `json:"experimental-compact-hash-check-enabled"`
+	ExperimentalCompactHashCheckTime    time.Duration `json:"experimental-compact-hash-check-time"`
+
 	// 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.
@@ -521,6 +524,9 @@ func NewConfig() *Config {
 		ExperimentalTxnModeWriteWithSharedBuffer: true,
 		ExperimentalMaxLearners:                  membership.DefaultMaxLearners,
 
+		ExperimentalCompactHashCheckEnabled: false,
+		ExperimentalCompactHashCheckTime:    time.Minute,
+
 		V2Deprecation: config.V2_DEPR_DEFAULT,
 
 		DiscoveryCfg: v3discovery.DiscoveryConfig{
@@ -759,6 +765,10 @@ func (cfg *Config) Validate() error {
 		return fmt.Errorf("setting experimental-enable-lease-checkpoint-persist requires experimental-enable-lease-checkpoint")
 	}
 
+	if cfg.ExperimentalCompactHashCheckTime <= 0 {
+		return fmt.Errorf("--experimental-compact-hash-check-time must be >0 (set to %v)", cfg.ExperimentalCompactHashCheckTime)
+	}
+
 	return nil
 }
 

server/embed/etcd.go

@@ -202,6 +202,8 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 		HostWhitelist:                            cfg.HostWhitelist,
 		InitialCorruptCheck:                      cfg.ExperimentalInitialCorruptCheck,
 		CorruptCheckTime:                         cfg.ExperimentalCorruptCheckTime,
+		CompactHashCheckEnabled:                  cfg.ExperimentalCompactHashCheckEnabled,
+		CompactHashCheckTime:                     cfg.ExperimentalCompactHashCheckTime,
 		PreVote:                                  cfg.PreVote,
 		Logger:                                   cfg.logger,
 		ForceNewCluster:                          cfg.ForceNewCluster,
@@ -344,6 +346,8 @@ func print(lg *zap.Logger, ec Config, sc config.ServerConfig, memberInitialized
 		zap.Bool("pre-vote", sc.PreVote),
 		zap.Bool("initial-corrupt-check", sc.InitialCorruptCheck),
 		zap.String("corrupt-check-time-interval", sc.CorruptCheckTime.String()),
+		zap.Bool("compact-check-time-enabled", sc.CompactHashCheckEnabled),
+		zap.Duration("compact-check-time-interval", sc.CompactHashCheckTime),
 		zap.String("auto-compaction-mode", sc.AutoCompactionMode),
 		zap.Duration("auto-compaction-retention", sc.AutoCompactionRetention),
 		zap.String("auto-compaction-interval", sc.AutoCompactionRetention.String()),

server/etcdmain/config.go

@@ -259,6 +259,8 @@ func newConfig() *config {
 	// experimental
 	fs.BoolVar(&cfg.ec.ExperimentalInitialCorruptCheck, "experimental-initial-corrupt-check", cfg.ec.ExperimentalInitialCorruptCheck, "Enable to check data corruption before serving any client/peer traffic.")
 	fs.DurationVar(&cfg.ec.ExperimentalCorruptCheckTime, "experimental-corrupt-check-time", cfg.ec.ExperimentalCorruptCheckTime, "Duration of time between cluster corruption check passes.")
+	fs.BoolVar(&cfg.ec.ExperimentalCompactHashCheckEnabled, "experimental-compact-hash-check-enabled", cfg.ec.ExperimentalCompactHashCheckEnabled, "Enable leader to periodically check followers compaction hashes.")
+	fs.DurationVar(&cfg.ec.ExperimentalCompactHashCheckTime, "experimental-compact-hash-check-time", cfg.ec.ExperimentalCompactHashCheckTime, "Duration of time between leader checks followers compaction hashes.")
 
 	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

server/etcdserver/corrupt.go

@@ -301,14 +301,13 @@ func (cm *corruptionChecker) CompactHashCheck() {
 			cm.mux.Unlock()
 			cm.lg.Info("finished compaction hash check", zap.Int("number-of-hashes-checked", i+1))
 			return
-		} else {
+		}
-			cm.lg.Warn("skipped checking hash; was not able to check all peers",
+		cm.lg.Warn("skipped revision in compaction hash check; was not able to check all peers",
 			zap.Int("number-of-peers-checked", peersChecked),
 			zap.Int("number-of-peers", len(peers)),
 			zap.Int64("revision", hash.Revision),
 		)
 	}
-	}
 	cm.lg.Info("finished compaction hash check", zap.Int("number-of-hashes-checked", len(hashes)))
 	return
 }

server/etcdserver/server.go

@@ -112,7 +112,6 @@ var (
 	// on the connection. Or we will not be able to reuse the connection
 	// (since it will timeout).
 	monitorVersionInterval = rafthttp.ConnWriteTimeout - time.Second
-	CompactHashCheckInterval = 15 * time.Second
 
 	recommendedMaxRequestBytesString = humanize.Bytes(uint64(recommendedMaxRequestBytes))
 	storeMemberAttributeRegexp       = regexp.MustCompile(path.Join(membership.StoreMembersPrefix, "[[:xdigit:]]{1,16}", "attributes"))
@@ -2219,9 +2218,13 @@ func (s *EtcdServer) monitorKVHash() {
 }
 
 func (s *EtcdServer) monitorCompactHash() {
+	if !s.Cfg.CompactHashCheckEnabled {
+		return
+	}
+	t := s.Cfg.CompactHashCheckTime
 	for {
 		select {
-		case <-time.After(CompactHashCheckInterval):
+		case <-time.After(t):
 		case <-s.stopping:
 			return
 		}

tests/e2e/corrupt_test.go

@@ -23,7 +23,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"go.etcd.io/etcd/api/v3/etcdserverpb"
 	"go.etcd.io/etcd/client/v3"
-	"go.etcd.io/etcd/server/v3/etcdserver"
 	"go.etcd.io/etcd/server/v3/storage/datadir"
 	"go.etcd.io/etcd/server/v3/storage/mvcc/testutil"
 	"go.etcd.io/etcd/tests/v3/framework/config"
@@ -136,10 +135,13 @@ func TestPeriodicCheckDetectsCorruption(t *testing.T) {
 }
 
 func TestCompactHashCheckDetectCorruption(t *testing.T) {
+	checkTime := time.Second
 	e2e.BeforeTest(t)
 	epc, err := e2e.NewEtcdProcessCluster(t, &e2e.EtcdProcessClusterConfig{
 		ClusterSize:             3,
 		KeepDataDir:             true,
+		CompactHashCheckEnabled: true,
+		CompactHashCheckTime:    checkTime,
 	})
 	if err != nil {
 		t.Fatalf("could not start etcd process cluster (%v)", err)
@@ -173,7 +175,7 @@ func TestCompactHashCheckDetectCorruption(t *testing.T) {
 	assert.NoError(t, err)
 	_, err = cc.Compact(5, config.CompactOption{})
 	assert.NoError(t, err)
-	time.Sleep(etcdserver.CompactHashCheckInterval * 11 / 10)
+	time.Sleep(checkTime * 11 / 10)
 	alarmResponse, err := cc.AlarmList()
 	assert.NoError(t, err, "error on alarm list")
 	assert.Equal(t, []*etcdserverpb.AlarmMember{{Alarm: etcdserverpb.AlarmType_CORRUPT, MemberID: memberID}}, alarmResponse.Alarms)

tests/framework/e2e/cluster.go

@@ -179,6 +179,8 @@ type EtcdProcessClusterConfig struct {
 
 	MaxConcurrentStreams    uint32 // default is math.MaxUint32
 	CorruptCheckTime        time.Duration
+	CompactHashCheckEnabled bool
+	CompactHashCheckTime    time.Duration
 }
 
 // NewEtcdProcessCluster launches a new cluster from etcd processes, returning
@@ -351,6 +353,12 @@ func (cfg *EtcdProcessClusterConfig) EtcdServerProcessConfigs(tb testing.TB) []*
 		if cfg.CorruptCheckTime != 0 {
 			args = append(args, "--experimental-corrupt-check-time", fmt.Sprintf("%s", cfg.CorruptCheckTime))
 		}
+		if cfg.CompactHashCheckEnabled {
+			args = append(args, "--experimental-compact-hash-check-enabled")
+		}
+		if cfg.CompactHashCheckTime != 0 {
+			args = append(args, "--experimental-compact-hash-check-time", cfg.CompactHashCheckTime.String())
+		}
 
 		etcdCfgs[i] = &EtcdServerProcessConfig{
 			lg:           lg,