use k8s native encoder

pkg/controllers/pd/tasks/pod_test.go

@@ -37,7 +37,7 @@ import (
 
 const (
 	fakeVersion         = "v1.2.3"
-	expectedPodSpecHash = "765648cb46"
+	expectedPodSpecHash = "7d4f6bf985"
 )
 
 func TestTaskPod(t *testing.T) {

pkg/controllers/tidb/tasks/pod_test.go

@@ -32,7 +32,7 @@ import (
 
 const (
 	fakeVersion = "v1.2.3"
-	podSpecHash = "6cfdc7d895"
+	podSpecHash = "fc445b4c6"
 )
 
 func TestTaskPod(t *testing.T) {

pkg/controllers/tiflash/tasks/pod_test.go

@@ -32,7 +32,7 @@ import (
 
 const (
 	fakeVersion = "v1.2.3"
-	fakePodHash = "76b9ffc44"
+	fakePodHash = "5bf69bf8f9"
 )
 
 func TestTaskPod(t *testing.T) {

pkg/controllers/tikv/tasks/pod_test.go

@@ -35,7 +35,7 @@ import (
 
 const (
 	fakeVersion = "v1.2.3"
-	podSpecHash = "6b85d6945f"
+	podSpecHash = "5f7b88ffbd"
 )
 
 func TestTaskPod(t *testing.T) {

pkg/utils/k8s/pod.go

@@ -15,19 +15,34 @@
 package k8s
 
 import (
-	"encoding/json"
+	"bytes"
 	"fmt"
 	"hash/fnv"
 
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
+	serializerjson "k8s.io/apimachinery/pkg/runtime/serializer/json"
 	"k8s.io/apimachinery/pkg/util/rand"
+	"k8s.io/client-go/kubernetes/scheme"
 
 	"github.com/pingcap/tidb-operator/apis/core/v1alpha1"
 	maputil "github.com/pingcap/tidb-operator/pkg/utils/map"
 	hashutil "github.com/pingcap/tidb-operator/third_party/kubernetes/pkg/util/hash"
 )
 
+var podEncoder = scheme.Codecs.EncoderForVersion(
+	serializerjson.NewSerializerWithOptions(
+		serializerjson.DefaultMetaFactory,
+		scheme.Scheme,
+		scheme.Scheme,
+		serializerjson.SerializerOptions{
+			Yaml:   false,
+			Pretty: false,
+			Strict: true,
+		}),
+	corev1.SchemeGroupVersion,
+)
+
 // CalculateHashAndSetLabels calculate the hash of pod spec and set it to the pod labels.
 func CalculateHashAndSetLabels(pod *corev1.Pod) {
 	spec := pod.Spec.DeepCopy()
@@ -38,9 +53,10 @@ func CalculateHashAndSetLabels(pod *corev1.Pod) {
 	}
 
 	// This prevents the hash from being changed when new fields are added to the `PodSpec` due to K8s version upgrades.
-	data, _ := json.Marshal(spec)
+	buf := bytes.Buffer{}
+	_ = podEncoder.Encode(&corev1.Pod{Spec: *spec}, &buf)
 	hasher := fnv.New32a()
-	hashutil.DeepHashObject(hasher, data)
+	hashutil.DeepHashObject(hasher, buf.Bytes())
 
 	if pod.Labels == nil {
 		pod.Labels = map[string]string{}

pkg/utils/k8s/revision/controller_revision.go

@@ -148,6 +148,7 @@ func getPatch(obj client.Object, gvk schema.GroupVersionKind) ([]byte, error) {
 				}),
 			gvk.GroupVersion(),
 		)
+		encoderMap[gvk.GroupVersion()] = encoder
 	}
 
 	buf := bytes.Buffer{}