fix tidb-operator crash when user modify sts upgrade strategy improperly

pkg/manager/member/pd_scaler_test.go

@@ -58,7 +58,7 @@ func TestPDScalerScaleOut(t *testing.T) {
 
 		oldSet := newStatefulSetForPDScale()
 		newSet := oldSet.DeepCopy()
-		newSet.Spec.Replicas = int32Pointer(7)
+		newSet.Spec.Replicas = controller.Int32Ptr(7)
 
 		scaler, _, pvcIndexer, pvcControl := newFakePDScaler()
 
@@ -252,7 +252,7 @@ func TestPDScalerScaleIn(t *testing.T) {
 
 		oldSet := newStatefulSetForPDScale()
 		newSet := oldSet.DeepCopy()
-		newSet.Spec.Replicas = int32Pointer(3)
+		newSet.Spec.Replicas = controller.Int32Ptr(3)
 
 		scaler, pdControl, pvcIndexer, pvcControl := newFakePDScaler()
 
@@ -374,7 +374,7 @@ func newStatefulSetForPDScale() *apps.StatefulSet {
 			Namespace: metav1.NamespaceDefault,
 		},
 		Spec: apps.StatefulSetSpec{
-			Replicas: int32Pointer(5),
+			Replicas: controller.Int32Ptr(5),
 		},
 	}
 	return set
@@ -389,11 +389,6 @@ func newPVCForStatefulSet(set *apps.StatefulSet, memberType v1alpha1.MemberType)
 	}
 }
 
-func int32Pointer(num int) *int32 {
-	i := int32(num)
-	return &i
-}
-
 func normalPDMember(tc *v1alpha1.TidbCluster) {
 	tcName := tc.GetName()
 	tc.Status.PD.Members = map[string]v1alpha1.PDMember{

pkg/manager/member/pd_upgrader.go

@@ -61,6 +61,16 @@ func (pu *pdUpgrader) gracefulUpgrade(tc *v1alpha1.TidbCluster, oldSet *apps.Sta
 		return nil
 	}
 
+	if oldSet.Spec.UpdateStrategy.Type == apps.OnDeleteStatefulSetStrategyType || oldSet.Spec.UpdateStrategy.RollingUpdate == nil {
+		// Manually bypass tidb-operator to modify statefulset directly, such as modify pd statefulset's RollingUpdate straregy to OnDelete strategy,
+		// or set RollingUpdate to nil, skip tidb-operator's rolling update logic in order to speed up the upgrade in the test environment occasionally.
+		// If we encounter this situation, we will let the native statefulset controller do the upgrade completely, which may be unsafe for upgrading pd.
+		// Therefore, in the production environment, we should try to avoid modifying the pd statefulset update strategy directly.
+		newSet.Spec.UpdateStrategy = oldSet.Spec.UpdateStrategy
+		glog.Warningf("tidbcluster: [%s/%s] pd statefulset %s UpdateStrategy has been modified manually", ns, tcName, oldSet.GetName())
+		return nil
+	}
+
 	setUpgradePartition(newSet, *oldSet.Spec.UpdateStrategy.RollingUpdate.Partition)
 	for i := tc.Status.PD.StatefulSet.Replicas - 1; i >= 0; i-- {
 		podName := pdPodName(tcName, i)

pkg/manager/member/pd_upgrader_test.go

@@ -79,7 +79,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 		}
 		SetLastAppliedConfigAnnotation(oldSet)
 
-		newSet.Spec.UpdateStrategy.RollingUpdate.Partition = func() *int32 { i := int32(3); return &i }()
+		newSet.Spec.UpdateStrategy.RollingUpdate.Partition = controller.Int32Ptr(3)
 
 		err := upgrader.Upgrade(tc, oldSet, newSet)
 		test.errExpectFn(g, err)
@@ -93,13 +93,54 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 				tc.Status.PD.Synced = true
 			},
 			changePods:        nil,
+			changeOldSet:      nil,
 			transferLeaderErr: false,
 			errExpectFn: func(g *GomegaWithT, err error) {
 				g.Expect(err).NotTo(HaveOccurred())
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(1); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
+			},
+		},
+		{
+			name: "modify oldSet update strategy to OnDelete",
+			changeFn: func(tc *v1alpha1.TidbCluster) {
+				tc.Status.PD.Synced = true
+			},
+			changePods: nil,
+			changeOldSet: func(set *apps.StatefulSet) {
+				set.Spec.UpdateStrategy = apps.StatefulSetUpdateStrategy{
+					Type: apps.OnDeleteStatefulSetStrategyType,
+				}
+			},
+			transferLeaderErr: false,
+			errExpectFn: func(g *GomegaWithT, err error) {
+				g.Expect(err).NotTo(HaveOccurred())
+			},
+			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
+				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy).To(Equal(apps.StatefulSetUpdateStrategy{Type: apps.OnDeleteStatefulSetStrategyType}))
+			},
+		},
+		{
+			name: "set oldSet's RollingUpdate strategy to nil",
+			changeFn: func(tc *v1alpha1.TidbCluster) {
+				tc.Status.PD.Synced = true
+			},
+			changePods: nil,
+			changeOldSet: func(set *apps.StatefulSet) {
+				set.Spec.UpdateStrategy = apps.StatefulSetUpdateStrategy{
+					Type: apps.RollingUpdateStatefulSetStrategyType,
+				}
+			},
+			transferLeaderErr: false,
+			errExpectFn: func(g *GomegaWithT, err error) {
+				g.Expect(err).NotTo(HaveOccurred())
+			},
+			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
+				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy).To(Equal(apps.StatefulSetUpdateStrategy{Type: apps.RollingUpdateStatefulSetStrategyType}))
 			},
 		},
 		{
@@ -117,7 +158,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(3); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(3)))
 			},
 		},
 		{
@@ -133,7 +174,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(3); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(3)))
 			},
 		},
 		{
@@ -149,7 +190,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(2); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(2)))
 			},
 		},
 		{
@@ -165,7 +206,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(2); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(2)))
 			},
 		},
 		{
@@ -180,7 +221,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.NormalPhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(3); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(3)))
 			},
 		},
 		{
@@ -196,7 +237,7 @@ func TestPDUpgraderUpgrade(t *testing.T) {
 			},
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
 				g.Expect(tc.Status.PD.Phase).To(Equal(v1alpha1.UpgradePhase))
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(func() *int32 { i := int32(2); return &i }()))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(2)))
 			},
 		},
 	}
@@ -226,7 +267,7 @@ func newStatefulSetForPDUpgrader() *apps.StatefulSet {
 			Namespace: metav1.NamespaceDefault,
 		},
 		Spec: apps.StatefulSetSpec{
-			Replicas: int32Pointer(3),
+			Replicas: controller.Int32Ptr(3),
 			Template: corev1.PodTemplateSpec{
 				Spec: corev1.PodSpec{
 					Containers: []corev1.Container{
@@ -239,7 +280,7 @@ func newStatefulSetForPDUpgrader() *apps.StatefulSet {
 			},
 			UpdateStrategy: apps.StatefulSetUpdateStrategy{
 				Type:          apps.RollingUpdateStatefulSetStrategyType,
-				RollingUpdate: &apps.RollingUpdateStatefulSetStrategy{Partition: func() *int32 { i := int32(2); return &i }()},
+				RollingUpdate: &apps.RollingUpdateStatefulSetStrategy{Partition: controller.Int32Ptr(2)},
 			},
 		},
 		Status: apps.StatefulSetStatus{

pkg/manager/member/tidb_upgrader.go

@@ -61,6 +61,16 @@ func (tdu *tidbUpgrader) Upgrade(tc *v1alpha1.TidbCluster, oldSet *apps.Stateful
 		return nil
 	}
 
+	if oldSet.Spec.UpdateStrategy.Type == apps.OnDeleteStatefulSetStrategyType || oldSet.Spec.UpdateStrategy.RollingUpdate == nil {
+		// Manually bypass tidb-operator to modify statefulset directly, such as modify tidb statefulset's RollingUpdate strategy to OnDelete strategy,
+		// or set RollingUpdate to nil, skip tidb-operator's rolling update logic in order to speed up the upgrade in the test environment occasionally.
+		// If we encounter this situation, we will let the native statefulset controller do the upgrade completely, which may be unsafe for upgrading tidb.
+		// Therefore, in the production environment, we should try to avoid modifying the tidb statefulset update strategy directly.
+		newSet.Spec.UpdateStrategy = oldSet.Spec.UpdateStrategy
+		glog.Warningf("tidbcluster: [%s/%s] tidb statefulset %s UpdateStrategy has been modified manually", ns, tcName, oldSet.GetName())
+		return nil
+	}
+
 	setUpgradePartition(newSet, *oldSet.Spec.UpdateStrategy.RollingUpdate.Partition)
 	for i := tc.Status.TiDB.StatefulSet.Replicas - 1; i >= 0; i-- {
 		podName := tidbPodName(tcName, i)

pkg/manager/member/tidb_upgrader_test.go

@@ -39,6 +39,7 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 		getLastAppliedConfigErr bool
 		resignDDLOwnerError     bool
 		errorExpect             bool
+		changeOldSet            func(set *apps.StatefulSet)
 		expectFn                func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet)
 	}
 
@@ -61,6 +62,10 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 		}
 
 		oldSet := newStatefulSetForTiDBUpgrader()
+		if test.changeOldSet != nil {
+			test.changeOldSet(oldSet)
+		}
+
 		newSet := oldSet.DeepCopy()
 		if test.getLastAppliedConfigErr {
 			oldSet.SetAnnotations(map[string]string{LastAppliedConfigAnnotation: "fake apply config"})
@@ -85,7 +90,42 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			},
 			getLastAppliedConfigErr: false,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(0); return &i }())))
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(0)))
+			},
+		},
+		{
+			name: "modify oldSet update strategy to OnDelete",
+			changeFn: func(tc *v1alpha1.TidbCluster) {
+				tc.Status.PD.Phase = v1alpha1.NormalPhase
+				tc.Status.TiKV.Phase = v1alpha1.NormalPhase
+			},
+			getLastAppliedConfigErr: false,
+			changeOldSet: func(set *apps.StatefulSet) {
+				set.Spec.UpdateStrategy = apps.StatefulSetUpdateStrategy{
+					Type: apps.OnDeleteStatefulSetStrategyType,
+				}
+			},
+			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy).To(Equal(apps.StatefulSetUpdateStrategy{Type: apps.OnDeleteStatefulSetStrategyType}))
+			},
+		},
+		{
+			name: "set oldSet's RollingUpdate strategy to nil",
+			changeFn: func(tc *v1alpha1.TidbCluster) {
+				tc.Status.PD.Phase = v1alpha1.NormalPhase
+				tc.Status.TiKV.Phase = v1alpha1.NormalPhase
+			},
+			changeOldSet: func(set *apps.StatefulSet) {
+				set.Spec.UpdateStrategy = apps.StatefulSetUpdateStrategy{
+					Type: apps.RollingUpdateStatefulSetStrategyType,
+				}
+			},
+			getLastAppliedConfigErr: false,
+			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy).To(Equal(apps.StatefulSetUpdateStrategy{Type: apps.RollingUpdateStatefulSetStrategyType}))
 			},
 		},
 		{
@@ -96,7 +136,7 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			},
 			getLastAppliedConfigErr: false,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 			},
 		},
 		{
@@ -107,7 +147,7 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			},
 			getLastAppliedConfigErr: false,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 			},
 		},
 		{
@@ -119,7 +159,8 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			},
 			getLastAppliedConfigErr: false,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 			},
 		},
 		{
@@ -131,7 +172,7 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			getLastAppliedConfigErr: true,
 			errorExpect:             true,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 			},
 		},
 		{
@@ -147,7 +188,8 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			getLastAppliedConfigErr: false,
 			errorExpect:             true,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 			},
 		},
 		{
@@ -160,7 +202,8 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			resignDDLOwnerError:     true,
 			errorExpect:             true,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(1); return &i }())))
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(1)))
 				g.Expect(tc.Status.TiDB.ResignDDLOwnerRetryCount).To(Equal(int32(1)))
 			},
 		},
@@ -175,7 +218,8 @@ func TestTiDBUpgrader_Upgrade(t *testing.T) {
 			resignDDLOwnerError:     true,
 			errorExpect:             false,
 			expectFn: func(g *GomegaWithT, tc *v1alpha1.TidbCluster, newSet *apps.StatefulSet) {
-				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal((func() *int32 { i := int32(0); return &i }())))
+				g.Expect(tc.Status.TiDB.Phase).To(Equal(v1alpha1.UpgradePhase))
+				g.Expect(newSet.Spec.UpdateStrategy.RollingUpdate.Partition).To(Equal(controller.Int32Ptr(0)))
 				g.Expect(tc.Status.TiDB.ResignDDLOwnerRetryCount).To(Equal(int32(0)))
 			},
 		},
@@ -201,7 +245,7 @@ func newStatefulSetForTiDBUpgrader() *apps.StatefulSet {
 			Namespace: metav1.NamespaceDefault,
 		},
 		Spec: apps.StatefulSetSpec{
-			Replicas: int32Pointer(2),
+			Replicas: controller.Int32Ptr(2),
 			Template: corev1.PodTemplateSpec{
 				Spec: corev1.PodSpec{
 					Containers: []corev1.Container{
@@ -214,7 +258,7 @@ func newStatefulSetForTiDBUpgrader() *apps.StatefulSet {
 			},
 			UpdateStrategy: apps.StatefulSetUpdateStrategy{Type: apps.RollingUpdateStatefulSetStrategyType,
 				RollingUpdate: &apps.RollingUpdateStatefulSetStrategy{
-					Partition: int32Pointer(1),
+					Partition: controller.Int32Ptr(1),
 				},
 			},
 		},

pkg/manager/member/tikv_scaler_test.go

@@ -54,7 +54,7 @@ func TestTiKVScalerScaleOut(t *testing.T) {
 
 		oldSet := newStatefulSetForPDScale()
 		newSet := oldSet.DeepCopy()
-		newSet.Spec.Replicas = int32Pointer(7)
+		newSet.Spec.Replicas = controller.Int32Ptr(7)
 
 		scaler, _, pvcIndexer, _, pvcControl := newFakeTiKVScaler()
 
@@ -171,7 +171,7 @@ func TestTiKVScalerScaleIn(t *testing.T) {
 
 		oldSet := newStatefulSetForPDScale()
 		newSet := oldSet.DeepCopy()
-		newSet.Spec.Replicas = int32Pointer(3)
+		newSet.Spec.Replicas = controller.Int32Ptr(3)
 
 		pod := &corev1.Pod{
 			TypeMeta: metav1.TypeMeta{Kind: "Pod", APIVersion: "v1"},

pkg/manager/member/tikv_upgrader.go

@@ -76,6 +76,16 @@ func (tku *tikvUpgrader) Upgrade(tc *v1alpha1.TidbCluster, oldSet *apps.Stateful
 		return nil
 	}
 
+	if oldSet.Spec.UpdateStrategy.Type == apps.OnDeleteStatefulSetStrategyType || oldSet.Spec.UpdateStrategy.RollingUpdate == nil {
+		// Manually bypass tidb-operator to modify statefulset directly, such as modify tikv statefulset's RollingUpdate strategy to OnDelete strategy,
+		// or set RollingUpdate to nil, skip tidb-operator's rolling update logic in order to speed up the upgrade in the test environment occasionally.
+		// If we encounter this situation, we will let the native statefulset controller do the upgrade completely, which may be unsafe for upgrading tikv.
+		// Therefore, in the production environment, we should try to avoid modifying the tikv statefulset update strategy directly.
+		newSet.Spec.UpdateStrategy = oldSet.Spec.UpdateStrategy
+		glog.Warningf("tidbcluster: [%s/%s] tikv statefulset %s UpdateStrategy has been modified manually", ns, tcName, oldSet.GetName())
+		return nil
+	}
+
 	setUpgradePartition(newSet, *oldSet.Spec.UpdateStrategy.RollingUpdate.Partition)
 	for i := tc.Status.TiKV.StatefulSet.Replicas - 1; i >= 0; i-- {
 		store := tku.getStoreByOrdinal(tc, i)