migrate experimental-initial-corrupt-check flag to feature gate.

Signed-off-by: Lan Liang <gcslyp@gmail.com>

server/embed/config_test.go

@@ -97,6 +97,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 		name                                string
 		serverFeatureGatesJSON              string
 		experimentalStopGRPCServiceOnDefrag string
+		experimentalInitialCorruptCheck     string
 		expectErr                           bool
 		expectedFeatures                    map[featuregate.Feature]bool
 	}{
@@ -105,6 +106,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.DistributedTracing:      false,
 				features.StopGRPCServiceOnDefrag: false,
+				features.InitialCorruptCheck:     false,
 			},
 		},
 		{
@@ -113,6 +115,12 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			experimentalStopGRPCServiceOnDefrag: "false",
 			expectErr:                           true,
 		},
+		{
+			name:                            "cannot set both experimental flag and feature gate flag for InitialCorruptCheck",
+			serverFeatureGatesJSON:          "InitialCorruptCheck=true",
+			experimentalInitialCorruptCheck: "false",
+			expectErr:                       true,
+		},
 		{
 			name:                                "ok to set different experimental flag and feature gate flag",
 			serverFeatureGatesJSON:              "DistributedTracing=true",
@@ -120,6 +128,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.DistributedTracing:      true,
 				features.StopGRPCServiceOnDefrag: true,
+				features.InitialCorruptCheck:     false,
 			},
 		},
 		{
@@ -128,6 +137,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.StopGRPCServiceOnDefrag: true,
 				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     false,
 			},
 		},
 		{
@@ -136,14 +146,43 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.StopGRPCServiceOnDefrag: false,
 				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     false,
 			},
 		},
 		{
-			name:                   "can set feature gate to true from feature gate flag",
+			name:                            "can set feature gate experimentalInitialCorruptCheck to true from experimental flag",
+			experimentalInitialCorruptCheck: "true",
+			expectedFeatures: map[featuregate.Feature]bool{
+				features.StopGRPCServiceOnDefrag: false,
+				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     true,
+			},
+		},
+		{
+			name:                            "can set feature gate experimentalInitialCorruptCheck to false from experimental flag",
+			experimentalInitialCorruptCheck: "false",
+			expectedFeatures: map[featuregate.Feature]bool{
+				features.StopGRPCServiceOnDefrag: false,
+				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     false,
+			},
+		},
+		{
+			name:                   "can set feature gate StopGRPCServiceOnDefrag to true from feature gate flag",
 			serverFeatureGatesJSON: "StopGRPCServiceOnDefrag=true",
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.StopGRPCServiceOnDefrag: true,
 				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     false,
+			},
+		},
+		{
+			name:                   "can set feature gate InitialCorruptCheck to true from feature gate flag",
+			serverFeatureGatesJSON: "InitialCorruptCheck=true",
+			expectedFeatures: map[featuregate.Feature]bool{
+				features.StopGRPCServiceOnDefrag: false,
+				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     true,
 			},
 		},
 		{
@@ -152,6 +191,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 			expectedFeatures: map[featuregate.Feature]bool{
 				features.StopGRPCServiceOnDefrag: false,
 				features.DistributedTracing:      false,
+				features.InitialCorruptCheck:     false,
 			},
 		},
 	}
@@ -159,11 +199,20 @@ func TestConfigFileFeatureGates(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			yc := struct {
 				ExperimentalStopGRPCServiceOnDefrag *bool  `json:"experimental-stop-grpc-service-on-defrag,omitempty"`
+				ExperimentalInitialCorruptCheck     *bool  `json:"experimental-initial-corrupt-check,omitempty"`
 				ServerFeatureGatesJSON              string `json:"feature-gates"`
 			}{
 				ServerFeatureGatesJSON: tc.serverFeatureGatesJSON,
 			}
 
+			if tc.experimentalInitialCorruptCheck != "" {
+				experimentalInitialCorruptCheck, err := strconv.ParseBool(tc.experimentalInitialCorruptCheck)
+				if err != nil {
+					t.Fatal(err)
+				}
+				yc.ExperimentalInitialCorruptCheck = &experimentalInitialCorruptCheck
+			}
+
 			if tc.experimentalStopGRPCServiceOnDefrag != "" {
 				experimentalStopGRPCServiceOnDefrag, err := strconv.ParseBool(tc.experimentalStopGRPCServiceOnDefrag)
 				if err != nil {
@@ -171,6 +220,7 @@ func TestConfigFileFeatureGates(t *testing.T) {
 				}
 				yc.ExperimentalStopGRPCServiceOnDefrag = &experimentalStopGRPCServiceOnDefrag
 			}
+
 			b, err := yaml.Marshal(&yc)
 			if err != nil {
 				t.Fatal(err)

server/embed/etcd.go

@@ -48,6 +48,7 @@ import (
 	"go.etcd.io/etcd/server/v3/etcdserver"
 	"go.etcd.io/etcd/server/v3/etcdserver/api/etcdhttp"
 	"go.etcd.io/etcd/server/v3/etcdserver/api/rafthttp"
+	"go.etcd.io/etcd/server/v3/features"
 	"go.etcd.io/etcd/server/v3/storage"
 	"go.etcd.io/etcd/server/v3/verify"
 )
@@ -203,7 +204,6 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 		TokenTTL:                                 cfg.AuthTokenTTL,
 		CORS:                                     cfg.CORS,
 		HostWhitelist:                            cfg.HostWhitelist,
-		InitialCorruptCheck:                      cfg.ExperimentalInitialCorruptCheck,
 		CorruptCheckTime:                         cfg.ExperimentalCorruptCheckTime,
 		CompactHashCheckEnabled:                  cfg.ExperimentalCompactHashCheckEnabled,
 		CompactHashCheckTime:                     cfg.ExperimentalCompactHashCheckTime,
@@ -259,7 +259,7 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 
 	// newly started member ("memberInitialized==false")
 	// does not need corruption check
-	if memberInitialized && srvcfg.InitialCorruptCheck {
+	if memberInitialized && srvcfg.ServerFeatureGate.Enabled(features.InitialCorruptCheck) {
 		if err = e.Server.CorruptionChecker().InitialCheck(); err != nil {
 			// set "EtcdServer" to nil, so that it does not block on "EtcdServer.Close()"
 			// (nothing to close since rafthttp transports have not been started)

server/etcdmain/help.go

@@ -273,7 +273,7 @@ Experimental distributed tracing:
     Number of samples to collect per million spans for distributed tracing. Disabled by default.
 
 Experimental feature:
-  --experimental-initial-corrupt-check 'false'
+  --experimental-initial-corrupt-check 'false'. It's deprecated, and will be decommissioned in v3.7. Use '--feature-gates=InitialCorruptCheck=true' instead.
     Enable to check data corruption before serving any client/peer traffic.
   --experimental-corrupt-check-time '0s'
     Duration of time between cluster corruption check passes.

server/features/etcd_features.go

@@ -45,18 +45,25 @@ const (
 	// alpha: v3.6
 	// main PR: https://github.com/etcd-io/etcd/pull/18279
 	StopGRPCServiceOnDefrag featuregate.Feature = "StopGRPCServiceOnDefrag"
+	// InitialCorruptCheck enable to check data corruption before serving any client/peer traffic.
+	// owner: @serathius
+	// alpha: v3.6
+	// main PR: https://github.com/etcd-io/etcd/pull/10524
+	InitialCorruptCheck featuregate.Feature = "InitialCorruptCheck"
 )
 
 var (
 	DefaultEtcdServerFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
 		DistributedTracing:      {Default: false, PreRelease: featuregate.Alpha},
 		StopGRPCServiceOnDefrag: {Default: false, PreRelease: featuregate.Alpha},
+		InitialCorruptCheck:     {Default: false, PreRelease: featuregate.Alpha},
 	}
 	// ExperimentalFlagToFeatureMap is the map from the cmd line flags of experimental features
 	// to their corresponding feature gates.
 	// Deprecated: only add existing experimental features here. DO NOT use for new features.
 	ExperimentalFlagToFeatureMap = map[string]featuregate.Feature{
 		"experimental-stop-grpc-service-on-defrag": StopGRPCServiceOnDefrag,
+		"experimental-initial-corrupt-check":       InitialCorruptCheck,
 	}
 )