fix(cluster): failed to update volume size. (#567)

add support for resizing volume
add unit test for sfsUpdated()

Author: runkecheng

mysqlcluster/syncer/statefulset.go

@@ -590,9 +590,15 @@ func (s *StatefulSetSyncer) backupIsRunning(ctx context.Context) (bool, error) {
 
 // Updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy' are forbidden.
 func (s *StatefulSetSyncer) sfsUpdated(existing *appsv1.StatefulSet) bool {
+	var resizeVolume = false
+	// TODO: this is a temporary workaround until we figure out a better way to do this.
+	if len(existing.Spec.VolumeClaimTemplates) > 0 && len(s.sfs.Spec.VolumeClaimTemplates) > 0 {
+		resizeVolume = existing.Spec.VolumeClaimTemplates[0].Spec.Resources.Requests.Storage().Cmp(*s.sfs.Spec.VolumeClaimTemplates[0].Spec.Resources.Requests.Storage()) != 0
+	}
 	return *existing.Spec.Replicas != *s.sfs.Spec.Replicas ||
 		!equality.Semantic.DeepEqual(existing.Spec.Template, s.sfs.Spec.Template) ||
-		existing.Spec.UpdateStrategy != s.sfs.Spec.UpdateStrategy
+		existing.Spec.UpdateStrategy != s.sfs.Spec.UpdateStrategy ||
+		resizeVolume
 }
 
 func (s *StatefulSetSyncer) podsAllUpdated(ctx context.Context) bool {

mysqlcluster/syncer/statefulset_test.go

@@ -0,0 +1,147 @@
+/*
+Copyright 2021 RadonDB.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syncer
+
+import (
+	"testing"
+
+	appsv1 "k8s.io/api/apps/v1"
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+)
+
+func TestStatefulSetSyncer_sfsUpdated(t *testing.T) {
+	mockSfs := &appsv1.StatefulSet{
+		Spec: appsv1.StatefulSetSpec{
+			Replicas: &[]int32{1}[0],
+			Template: v1.PodTemplateSpec{
+				Spec: v1.PodSpec{
+					Containers: []v1.Container{
+						{
+							Name: "test1",
+						},
+					},
+				},
+			},
+			VolumeClaimTemplates: []v1.PersistentVolumeClaim{
+				{
+					Spec: v1.PersistentVolumeClaimSpec{
+						Resources: v1.ResourceRequirements{
+							Requests: v1.ResourceList{
+								v1.ResourceStorage: resource.MustParse("1Gi"),
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	updateReplicas := func() *appsv1.StatefulSet {
+		sfs := mockSfs.DeepCopy()
+		sfs.Spec.Replicas = &[]int32{2}[0]
+		return sfs
+	}
+	updateTemplate := func() *appsv1.StatefulSet {
+		sfs := mockSfs.DeepCopy()
+		sfs.Spec.Template.Spec.Containers[0].Name = "test2"
+		return sfs
+	}
+	updateVolume := func() *appsv1.StatefulSet {
+		sfs := mockSfs.DeepCopy()
+		sfs.Spec.VolumeClaimTemplates[0].Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse("2Gi")
+		return sfs
+	}
+	volumeNotExist := func() *appsv1.StatefulSet {
+		sfs := mockSfs.DeepCopy()
+		sfs.Spec.VolumeClaimTemplates = nil
+		return sfs
+	}
+
+	type fields struct {
+		sfs *appsv1.StatefulSet
+	}
+	type args struct {
+		existing *appsv1.StatefulSet
+	}
+	tests := []struct {
+		name   string
+		fields fields
+		args   args
+		want   bool
+	}{
+		{
+			name: "update replicas",
+			fields: fields{
+				sfs: updateReplicas(),
+			},
+			args: args{
+				existing: mockSfs,
+			},
+			want: true,
+		},
+		{
+			name: "update template",
+			fields: fields{
+				sfs: updateTemplate(),
+			},
+			args: args{
+				existing: mockSfs,
+			},
+			want: true,
+		},
+		{
+			name: "update volume size",
+			fields: fields{
+				sfs: updateVolume(),
+			},
+			args: args{
+				existing: mockSfs,
+			},
+			want: true,
+		},
+		{
+			name: "no change",
+			fields: fields{
+				sfs: mockSfs,
+			},
+			args: args{
+				existing: mockSfs,
+			},
+			want: false,
+		},
+		{
+			name: "volume not exist",
+			fields: fields{
+				sfs: mockSfs,
+			},
+			args: args{
+				existing: volumeNotExist(),
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &StatefulSetSyncer{
+				sfs: tt.fields.sfs,
+			}
+			if got := s.sfsUpdated(tt.args.existing); got != tt.want {
+				t.Errorf("StatefulSetSyncer.sfsUpdated() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}