Merge pull request #81342 from knight42/fix/kubectl-patch-scale

Refactor `kubectl scale` to patch scale subresource

staging/src/k8s.io/kubectl/pkg/cmd/rollingupdate/BUILD

@@ -15,7 +15,6 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
-        "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/intstr:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",

staging/src/k8s.io/kubectl/pkg/cmd/rollingupdate/rolling_updater.go

@@ -28,7 +28,6 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
-	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/apimachinery/pkg/util/wait"
 	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
@@ -413,7 +412,7 @@ func (r *RollingUpdater) scaleDown(newRc, oldRc *corev1.ReplicationController, d
 // scalerScaleAndWait scales a controller using a Scaler and a real client.
 func (r *RollingUpdater) scaleAndWaitWithScaler(rc *corev1.ReplicationController, retry *scale.RetryParams, wait *scale.RetryParams) (*corev1.ReplicationController, error) {
 	scaler := scale.NewScaler(r.scaleClient)
-	if err := scaler.Scale(rc.Namespace, rc.Name, uint(valOrZero(rc.Spec.Replicas)), &scale.ScalePrecondition{Size: -1, ResourceVersion: ""}, retry, wait, schema.GroupResource{Resource: "replicationcontrollers"}); err != nil {
+	if err := scaler.Scale(rc.Namespace, rc.Name, uint(valOrZero(rc.Spec.Replicas)), &scale.ScalePrecondition{Size: -1, ResourceVersion: ""}, retry, wait, corev1.SchemeGroupVersion.WithResource("replicationcontrollers")); err != nil {
 		return nil, err
 	}
 	return r.rcClient.ReplicationControllers(rc.Namespace).Get(rc.Name, metav1.GetOptions{})

staging/src/k8s.io/kubectl/pkg/cmd/scale/scale.go

@@ -227,7 +227,7 @@ func (o *ScaleOptions) RunScale() error {
 		}
 
 		mapping := info.ResourceMapping()
-		if err := o.scaler.Scale(info.Namespace, info.Name, uint(o.Replicas), precondition, retry, waitForReplicas, mapping.Resource.GroupResource()); err != nil {
+		if err := o.scaler.Scale(info.Namespace, info.Name, uint(o.Replicas), precondition, retry, waitForReplicas, mapping.Resource); err != nil {
 			return err
 		}
 

staging/src/k8s.io/kubectl/pkg/scale/BUILD

@@ -9,8 +9,8 @@ go_library(
     deps = [
         "//staging/src/k8s.io/api/autoscaling/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
-        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/client-go/scale:go_default_library",
     ],
@@ -27,6 +27,7 @@ go_test(
         "//staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/client-go/scale:go_default_library",
         "//staging/src/k8s.io/client-go/scale/fake:go_default_library",
         "//staging/src/k8s.io/client-go/testing:go_default_library",

staging/src/k8s.io/kubectl/pkg/scale/scale.go

@@ -23,8 +23,8 @@ import (
 
 	autoscalingv1 "k8s.io/api/autoscaling/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/wait"
 	scaleclient "k8s.io/client-go/scale"
 )
@@ -35,10 +35,10 @@ type Scaler interface {
 	// retries in the event of resource version mismatch (if retry is not nil),
 	// and optionally waits until the status of the resource matches newSize (if wait is not nil)
 	// TODO: Make the implementation of this watch-based (#56075) once #31345 is fixed.
-	Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, wait *RetryParams, gr schema.GroupResource) error
+	Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, wait *RetryParams, gvr schema.GroupVersionResource) error
 	// ScaleSimple does a simple one-shot attempt at scaling - not useful on its own, but
 	// a necessary building block for Scale
-	ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint, gr schema.GroupResource) (updatedResourceVersion string, err error)
+	ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint, gvr schema.GroupVersionResource) (updatedResourceVersion string, err error)
 }
 
 // NewScaler get a scaler for a given resource
@@ -77,9 +77,9 @@ func NewRetryParams(interval, timeout time.Duration) *RetryParams {
 }
 
 // ScaleCondition is a closure around Scale that facilitates retries via util.wait
-func ScaleCondition(r Scaler, precondition *ScalePrecondition, namespace, name string, count uint, updatedResourceVersion *string, gr schema.GroupResource) wait.ConditionFunc {
+func ScaleCondition(r Scaler, precondition *ScalePrecondition, namespace, name string, count uint, updatedResourceVersion *string, gvr schema.GroupVersionResource) wait.ConditionFunc {
 	return func() (bool, error) {
-		rv, err := r.ScaleSimple(namespace, name, precondition, count, gr)
+		rv, err := r.ScaleSimple(namespace, name, precondition, count, gvr)
 		if updatedResourceVersion != nil {
 			*updatedResourceVersion = rv
 		}
@@ -113,23 +113,25 @@ type genericScaler struct {
 var _ Scaler = &genericScaler{}
 
 // ScaleSimple updates a scale of a given resource. It returns the resourceVersion of the scale if the update was successful.
-func (s *genericScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint, gr schema.GroupResource) (updatedResourceVersion string, err error) {
-	scale := &autoscalingv1.Scale{
-		ObjectMeta: metav1.ObjectMeta{Namespace: namespace, Name: name},
-	}
+func (s *genericScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint, gvr schema.GroupVersionResource) (updatedResourceVersion string, err error) {
 	if preconditions != nil {
-		var err error
-		scale, err = s.scaleNamespacer.Scales(namespace).Get(gr, name)
+		scale, err := s.scaleNamespacer.Scales(namespace).Get(gvr.GroupResource(), name)
 		if err != nil {
 			return "", err
 		}
-		if err := preconditions.validate(scale); err != nil {
+		if err = preconditions.validate(scale); err != nil {
 			return "", err
 		}
+		scale.Spec.Replicas = int32(newSize)
+		updatedScale, err := s.scaleNamespacer.Scales(namespace).Update(gvr.GroupResource(), scale)
+		if err != nil {
+			return "", err
+		}
+		return updatedScale.ResourceVersion, nil
 	}
 
-	scale.Spec.Replicas = int32(newSize)
-	updatedScale, err := s.scaleNamespacer.Scales(namespace).Update(gr, scale)
+	patch := []byte(fmt.Sprintf(`{"spec":{"replicas":%d}}`, newSize))
+	updatedScale, err := s.scaleNamespacer.Scales(namespace).Patch(gvr, name, types.MergePatchType, patch)
 	if err != nil {
 		return "", err
 	}
@@ -138,17 +140,17 @@ func (s *genericScaler) ScaleSimple(namespace, name string, preconditions *Scale
 
 // Scale updates a scale of a given resource to a new size, with optional precondition check (if preconditions is not nil),
 // optional retries (if retry is not nil), and then optionally waits for the status to reach desired count.
-func (s *genericScaler) Scale(namespace, resourceName string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams, gr schema.GroupResource) error {
+func (s *genericScaler) Scale(namespace, resourceName string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams, gvr schema.GroupVersionResource) error {
 	if retry == nil {
 		// make it try only once, immediately
 		retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
 	}
-	cond := ScaleCondition(s, preconditions, namespace, resourceName, newSize, nil, gr)
+	cond := ScaleCondition(s, preconditions, namespace, resourceName, newSize, nil, gvr)
 	if err := wait.PollImmediate(retry.Interval, retry.Timeout, cond); err != nil {
 		return err
 	}
 	if waitForReplicas != nil {
-		return WaitForScaleHasDesiredReplicas(s.scaleNamespacer, gr, resourceName, namespace, newSize, waitForReplicas)
+		return WaitForScaleHasDesiredReplicas(s.scaleNamespacer, gvr.GroupResource(), resourceName, namespace, newSize, waitForReplicas)
 	}
 	return nil
 }

staging/src/k8s.io/kubectl/pkg/scale/scale_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package scale
 
 import (
+	"encoding/json"
 	"fmt"
 	"testing"
 	"time"
@@ -27,24 +28,47 @@ import (
 	api "k8s.io/apimachinery/pkg/apis/testapigroup/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/scale"
 	fakescale "k8s.io/client-go/scale/fake"
 	testcore "k8s.io/client-go/testing"
 )
 
+var (
+	rcgvr = schema.GroupVersionResource{
+		Group:    "",
+		Version:  "v1",
+		Resource: "replicationcontrollers",
+	}
+	rsgvr = schema.GroupVersionResource{
+		Group:    "extensions",
+		Version:  "v1beta1",
+		Resource: "replicasets",
+	}
+	deploygvr = schema.GroupVersionResource{
+		Group:    "apps",
+		Version:  "v1",
+		Resource: "deployments",
+	}
+	stsgvr = schema.GroupVersionResource{
+		Group:    "apps",
+		Version:  "v1",
+		Resource: "statefulsets",
+	}
+)
+
 func TestReplicationControllerScaleRetry(t *testing.T) {
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
+		"patch": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
 	}
-	scaleClientExpectedAction := []string{"get", "update", "get"}
+	scaleClientExpectedAction := []string{"patch", "get"}
 	scaleClient := createFakeScaleClient("replicationcontrollers", "foo-v1", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo-v1"
 	namespace := metav1.NamespaceDefault
 
-	scaleFunc := ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "", Resource: "replicationcontrollers"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, rcgvr)
 	pass, err := scaleFunc()
 	if pass {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -52,8 +76,8 @@ func TestReplicationControllerScaleRetry(t *testing.T) {
 	if err != nil {
 		t.Errorf("Did not expect an error on update conflict failure, got %v", err)
 	}
-	preconditions = ScalePrecondition{3, ""}
-	scaleFunc = ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "", Resource: "replicationcontrollers"})
+	preconditions := ScalePrecondition{3, ""}
+	scaleFunc = ScaleCondition(scaler, &preconditions, namespace, name, count, nil, rcgvr)
 	pass, err = scaleFunc()
 	if err == nil {
 		t.Errorf("Expected error on precondition failure")
@@ -71,17 +95,16 @@ func TestReplicationControllerScaleRetry(t *testing.T) {
 
 func TestReplicationControllerScaleInvalid(t *testing.T) {
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
+		"patch": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
 	}
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("replicationcontrollers", "foo-v1", 1, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo-v1"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "", Resource: "replicationcontrollers"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, rcgvr)
 	pass, err := scaleFunc()
 	if pass {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -101,13 +124,12 @@ func TestReplicationControllerScaleInvalid(t *testing.T) {
 }
 
 func TestReplicationControllerScale(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("replicationcontrollers", "foo-v1", 2, nil)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo-v1"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "", Resource: "replicationcontrollers"})
+	err := scaler.Scale("default", name, count, nil, nil, nil, rcgvr)
 
 	if err != nil {
 		t.Fatalf("unexpected error occurred = %v while scaling the resource", err)
@@ -130,7 +152,7 @@ func TestReplicationControllerScaleFailsPreconditions(t *testing.T) {
 	preconditions := ScalePrecondition{2, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "", Resource: "replicationcontrollers"})
+	err := scaler.Scale("default", name, count, &preconditions, nil, nil, rcgvr)
 	if err == nil {
 		t.Fatal("expected to get an error but none was returned")
 	}
@@ -147,17 +169,16 @@ func TestReplicationControllerScaleFailsPreconditions(t *testing.T) {
 
 func TestDeploymentScaleRetry(t *testing.T) {
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
+		"patch": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
 	}
-	scaleClientExpectedAction := []string{"get", "update", "get"}
+	scaleClientExpectedAction := []string{"patch", "get"}
 	scaleClient := createFakeScaleClient("deployments", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := &ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "deployments"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, deploygvr)
 	pass, err := scaleFunc()
 	if pass != false {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -165,8 +186,8 @@ func TestDeploymentScaleRetry(t *testing.T) {
 	if err != nil {
 		t.Errorf("Did not expect an error on update failure, got %v", err)
 	}
-	preconditions = &ScalePrecondition{3, ""}
-	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "deployments"})
+	preconditions := &ScalePrecondition{3, ""}
+	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, deploygvr)
 	pass, err = scaleFunc()
 	if err == nil {
 		t.Error("Expected error on precondition failure")
@@ -183,13 +204,12 @@ func TestDeploymentScaleRetry(t *testing.T) {
 }
 
 func TestDeploymentScale(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("deployments", "foo", 2, nil)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "apps", Resource: "deployments"})
+	err := scaler.Scale("default", name, count, nil, nil, nil, deploygvr)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -205,18 +225,17 @@ func TestDeploymentScale(t *testing.T) {
 }
 
 func TestDeploymentScaleInvalid(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
+		"patch": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
 	}
 	scaleClient := createFakeScaleClient("deployments", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "deployments"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, deploygvr)
 	pass, err := scaleFunc()
 	if pass {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -242,7 +261,7 @@ func TestDeploymentScaleFailsPreconditions(t *testing.T) {
 	preconditions := ScalePrecondition{2, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "apps", Resource: "deployments"})
+	err := scaler.Scale("default", name, count, &preconditions, nil, nil, deploygvr)
 	if err == nil {
 		t.Fatal("exptected to get an error but none was returned")
 	}
@@ -258,13 +277,12 @@ func TestDeploymentScaleFailsPreconditions(t *testing.T) {
 }
 
 func TestStatefulSetScale(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("statefulsets", "foo", 2, nil)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "apps", Resource: "statefulset"})
+	err := scaler.Scale("default", name, count, nil, nil, nil, stsgvr)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -280,18 +298,17 @@ func TestStatefulSetScale(t *testing.T) {
 }
 
 func TestStatefulSetScaleRetry(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update", "get"}
+	scaleClientExpectedAction := []string{"patch", "get"}
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
+		"patch": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
 	}
 	scaleClient := createFakeScaleClient("statefulsets", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := &ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "statefulsets"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, stsgvr)
 	pass, err := scaleFunc()
 	if pass != false {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -299,8 +316,8 @@ func TestStatefulSetScaleRetry(t *testing.T) {
 	if err != nil {
 		t.Errorf("Did not expect an error on update failure, got %v", err)
 	}
-	preconditions = &ScalePrecondition{3, ""}
-	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "statefulsets"})
+	preconditions := &ScalePrecondition{3, ""}
+	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, stsgvr)
 	pass, err = scaleFunc()
 	if err == nil {
 		t.Error("Expected error on precondition failure")
@@ -317,18 +334,17 @@ func TestStatefulSetScaleRetry(t *testing.T) {
 }
 
 func TestStatefulSetScaleInvalid(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
+		"patch": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
 	}
 	scaleClient := createFakeScaleClient("statefulsets", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "apps", Resource: "statefulsets"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, stsgvr)
 	pass, err := scaleFunc()
 	if pass {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -354,7 +370,7 @@ func TestStatefulSetScaleFailsPreconditions(t *testing.T) {
 	preconditions := ScalePrecondition{2, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "apps", Resource: "statefulsets"})
+	err := scaler.Scale("default", name, count, &preconditions, nil, nil, stsgvr)
 	if err == nil {
 		t.Fatal("expected to get an error but none was returned")
 	}
@@ -370,13 +386,12 @@ func TestStatefulSetScaleFailsPreconditions(t *testing.T) {
 }
 
 func TestReplicaSetScale(t *testing.T) {
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("replicasets", "foo", 10, nil)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "extensions", Resource: "replicasets"})
+	err := scaler.Scale("default", name, count, nil, nil, nil, rsgvr)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -393,17 +408,16 @@ func TestReplicaSetScale(t *testing.T) {
 
 func TestReplicaSetScaleRetry(t *testing.T) {
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
+		"patch": kerrors.NewConflict(api.Resource("Status"), "foo", nil),
 	}
-	scaleClientExpectedAction := []string{"get", "update", "get"}
+	scaleClientExpectedAction := []string{"patch", "get"}
 	scaleClient := createFakeScaleClient("replicasets", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := &ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "extensions", Resource: "replicasets"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, rsgvr)
 	pass, err := scaleFunc()
 	if pass != false {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -411,8 +425,8 @@ func TestReplicaSetScaleRetry(t *testing.T) {
 	if err != nil {
 		t.Errorf("Did not expect an error on update failure, got %v", err)
 	}
-	preconditions = &ScalePrecondition{3, ""}
-	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, schema.GroupResource{Group: "extensions", Resource: "replicasets"})
+	preconditions := &ScalePrecondition{3, ""}
+	scaleFunc = ScaleCondition(scaler, preconditions, namespace, name, count, nil, rsgvr)
 	pass, err = scaleFunc()
 	if err == nil {
 		t.Error("Expected error on precondition failure")
@@ -430,17 +444,16 @@ func TestReplicaSetScaleRetry(t *testing.T) {
 
 func TestReplicaSetScaleInvalid(t *testing.T) {
 	verbsOnError := map[string]*kerrors.StatusError{
-		"update": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
+		"patch": kerrors.NewInvalid(api.Kind("Status"), "foo", nil),
 	}
-	scaleClientExpectedAction := []string{"get", "update"}
+	scaleClientExpectedAction := []string{"patch"}
 	scaleClient := createFakeScaleClient("replicasets", "foo", 2, verbsOnError)
 	scaler := NewScaler(scaleClient)
-	preconditions := ScalePrecondition{-1, ""}
 	count := uint(3)
 	name := "foo"
 	namespace := "default"
 
-	scaleFunc := ScaleCondition(scaler, &preconditions, namespace, name, count, nil, schema.GroupResource{Group: "extensions", Resource: "replicasets"})
+	scaleFunc := ScaleCondition(scaler, nil, namespace, name, count, nil, rsgvr)
 	pass, err := scaleFunc()
 	if pass {
 		t.Errorf("Expected an update failure to return pass = false, got pass = %v", pass)
@@ -466,7 +479,7 @@ func TestReplicaSetsGetterFailsPreconditions(t *testing.T) {
 	preconditions := ScalePrecondition{2, ""}
 	count := uint(3)
 	name := "foo"
-	err := scaler.Scale("default", name, count, &preconditions, nil, nil, schema.GroupResource{Group: "extensions", Resource: "replicasets"})
+	err := scaler.Scale("default", name, count, &preconditions, nil, nil, rsgvr)
 	if err == nil {
 		t.Fatal("expected to get an error but non was returned")
 	}
@@ -484,33 +497,44 @@ func TestReplicaSetsGetterFailsPreconditions(t *testing.T) {
 // TestGenericScaleSimple exercises GenericScaler.ScaleSimple method
 func TestGenericScaleSimple(t *testing.T) {
 	// test data
-	scaleClient := createFakeScaleClient("deployments", "abc", 10, nil)
+	scaleClient := createFakeScaleClient("deployments", "abc", 5, nil)
+	// expected actions
+	scaleClientExpectedAction := []string{"patch", "get", "update", "get", "update", "get", "get", "update", "get"}
 
 	// test scenarios
 	scenarios := []struct {
 		name         string
-		precondition ScalePrecondition
+		precondition *ScalePrecondition
 		newSize      int
-		targetGR     schema.GroupResource
+		targetGVR    schema.GroupVersionResource
 		resName      string
 		scaleGetter  scale.ScalesGetter
 		expectError  bool
 	}{
+		// scenario 0: scale up the "abc" deployment without precondition
+		{
+			name:         "scale up the \"abc\" deployment without precondition",
+			precondition: nil,
+			newSize:      10,
+			targetGVR:    deploygvr,
+			resName:      "abc",
+			scaleGetter:  scaleClient,
+		},
 		// scenario 1: scale up the "abc" deployment
 		{
 			name:         "scale up the \"abc\" deployment",
-			precondition: ScalePrecondition{10, ""},
+			precondition: &ScalePrecondition{10, ""},
 			newSize:      20,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 		},
 		// scenario 2: scale down the "abc" deployment
 		{
 			name:         "scale down the \"abs\" deployment",
-			precondition: ScalePrecondition{20, ""},
+			precondition: &ScalePrecondition{20, ""},
 			newSize:      5,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 		},
@@ -518,9 +542,9 @@ func TestGenericScaleSimple(t *testing.T) {
 		// note that the previous scenario (2) set the size to 5
 		{
 			name:         "precondition error, expected size is 1",
-			precondition: ScalePrecondition{1, ""},
+			precondition: &ScalePrecondition{1, ""},
 			newSize:      5,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 			expectError:  true,
@@ -528,18 +552,18 @@ func TestGenericScaleSimple(t *testing.T) {
 		// scenario 4: precondition is not validated when the precondition size is set to -1
 		{
 			name:         "precondition is not validated when the size is set to -1",
-			precondition: ScalePrecondition{-1, ""},
+			precondition: &ScalePrecondition{-1, ""},
 			newSize:      5,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 		},
 		// scenario 5: precondition error, resource version mismatch
 		{
 			name:         "precondition error, resource version mismatch",
-			precondition: ScalePrecondition{5, "v1"},
+			precondition: &ScalePrecondition{5, "v1"},
 			newSize:      5,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 			expectError:  true,
@@ -551,7 +575,7 @@ func TestGenericScaleSimple(t *testing.T) {
 		t.Run(fmt.Sprintf("running scenario %d: %s", index+1, scenario.name), func(t *testing.T) {
 			target := NewScaler(scenario.scaleGetter)
 
-			resVersion, err := target.ScaleSimple("default", scenario.resName, &scenario.precondition, uint(scenario.newSize), scenario.targetGR)
+			resVersion, err := target.ScaleSimple("default", scenario.resName, scenario.precondition, uint(scenario.newSize), scenario.targetGVR)
 
 			if scenario.expectError && err == nil {
 				t.Fatal("expected an error but was not returned")
@@ -564,39 +588,61 @@ func TestGenericScaleSimple(t *testing.T) {
 			}
 		})
 	}
+
+	// check actions
+	actions := scaleClient.Actions()
+	if len(actions) != len(scaleClientExpectedAction) {
+		t.Errorf("unexpected actions: %v, expected %d actions got %d", actions, len(scaleClientExpectedAction), len(actions))
+	}
+	for i, verb := range scaleClientExpectedAction {
+		if actions[i].GetVerb() != verb {
+			t.Errorf("unexpected action: %+v, expected %s", actions[i].GetVerb(), verb)
+		}
+	}
 }
 
 // TestGenericScale exercises GenericScaler.Scale method
 func TestGenericScale(t *testing.T) {
 	// test data
-	scaleClient := createFakeScaleClient("deployments", "abc", 10, nil)
+	scaleClient := createFakeScaleClient("deployments", "abc", 5, nil)
+	// expected actions
+	scaleClientExpectedAction := []string{"patch", "get", "update", "get", "get"}
 
 	// test scenarios
 	scenarios := []struct {
 		name            string
-		precondition    ScalePrecondition
+		precondition    *ScalePrecondition
 		newSize         int
-		targetGR        schema.GroupResource
+		targetGVR       schema.GroupVersionResource
 		resName         string
 		scaleGetter     scale.ScalesGetter
 		waitForReplicas *RetryParams
 		expectError     bool
 	}{
+		// scenario 0: scale up the "abc" deployment without precondition
+		{
+			name:         "scale up the \"abc\" deployment without precondition",
+			precondition: nil,
+			newSize:      10,
+			targetGVR:    deploygvr,
+			resName:      "abc",
+			scaleGetter:  scaleClient,
+		},
 		// scenario 1: scale up the "abc" deployment
 		{
 			name:         "scale up the \"abc\" deployment",
-			precondition: ScalePrecondition{10, ""},
+			precondition: &ScalePrecondition{10, ""},
 			newSize:      20,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "abc",
 			scaleGetter:  scaleClient,
 		},
 		//scenario 2: a resource name cannot be empty
 		{
 			name:         "a resource name cannot be empty",
-			precondition: ScalePrecondition{10, ""},
+			precondition: &ScalePrecondition{10, ""},
 			newSize:      20,
-			targetGR:     schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:    deploygvr,
 			resName:      "",
 			scaleGetter:  scaleClient,
 			expectError:  true,
@@ -604,9 +650,9 @@ func TestGenericScale(t *testing.T) {
 		// scenario 3: wait for replicas error due to status.Replicas != spec.Replicas
 		{
 			name:            "wait for replicas error due to status.Replicas != spec.Replicas",
-			precondition:    ScalePrecondition{10, ""},
+			precondition:    &ScalePrecondition{10, ""},
 			newSize:         20,
-			targetGR:        schema.GroupResource{Group: "apps", Resource: "deployments"},
+			targetGVR:       deploygvr,
 			resName:         "abc",
 			scaleGetter:     scaleClient,
 			waitForReplicas: &RetryParams{time.Duration(5 * time.Second), time.Duration(5 * time.Second)},
@@ -619,7 +665,7 @@ func TestGenericScale(t *testing.T) {
 		t.Run(scenario.name, func(t *testing.T) {
 			target := NewScaler(scenario.scaleGetter)
 
-			err := target.Scale("default", scenario.resName, uint(scenario.newSize), &scenario.precondition, nil, scenario.waitForReplicas, scenario.targetGR)
+			err := target.Scale("default", scenario.resName, uint(scenario.newSize), scenario.precondition, nil, scenario.waitForReplicas, scenario.targetGVR)
 
 			if scenario.expectError && err == nil {
 				t.Fatal("expected an error but was not returned")
@@ -629,6 +675,17 @@ func TestGenericScale(t *testing.T) {
 			}
 		})
 	}
+
+	// check actions
+	actions := scaleClient.Actions()
+	if len(actions) != len(scaleClientExpectedAction) {
+		t.Errorf("unexpected actions: %v, expected %d actions got %d", actions, len(scaleClientExpectedAction), len(actions))
+	}
+	for i, verb := range scaleClientExpectedAction {
+		if actions[i].GetVerb() != verb {
+			t.Errorf("unexpected action: %+v, expected %s", actions[i].GetVerb(), verb)
+		}
+	}
 }
 
 func createFakeScaleClient(resource string, resourceName string, replicas int, errorsOnVerb map[string]*kerrors.StatusError) *fakescale.FakeScaleClient {
@@ -659,6 +716,7 @@ func createFakeScaleClient(resource string, resourceName string, replicas int, e
 		}
 		return true, obj, nil
 	})
+
 	scaleClient.AddReactor("update", resource, func(rawAction testcore.Action) (handled bool, ret runtime.Object, err error) {
 		action := rawAction.(testcore.UpdateAction)
 		obj := action.GetObject().(*autoscalingv1.Scale)
@@ -679,5 +737,35 @@ func createFakeScaleClient(resource string, resourceName string, replicas int, e
 			},
 		}, nil
 	})
+
+	scaleClient.AddReactor("patch", resource, func(rawAction testcore.Action) (handled bool, ret runtime.Object, err error) {
+		action := rawAction.(testcore.PatchAction)
+		pt := action.GetPatchType()
+		if pt != types.MergePatchType {
+			return true, nil, fmt.Errorf("unexpected patch type: expected = %s, got = %s", types.MergePatchType, pt)
+		}
+		var scale autoscalingv1.Scale
+		err = json.Unmarshal(action.GetPatch(), &scale)
+		if err != nil {
+			return true, nil, fmt.Errorf("invalid patch: %s", err)
+		}
+		name := action.GetName()
+		if name != resourceName {
+			return true, nil, fmt.Errorf("expected = %s, got = %s", resourceName, name)
+		}
+		if anError, should := shouldReturnAnError("patch"); should {
+			return true, nil, anError
+		}
+		newReplicas = scale.Spec.Replicas
+		return true, &autoscalingv1.Scale{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      name,
+				Namespace: action.GetNamespace(),
+			},
+			Spec: autoscalingv1.ScaleSpec{
+				Replicas: newReplicas,
+			},
+		}, nil
+	})
 	return scaleClient
 }

test/e2e/framework/rc_util.go

@@ -120,7 +120,7 @@ func DeleteRCAndWaitForGC(c clientset.Interface, ns, name string) error {
 
 // ScaleRC scales Replication Controller to be desired size.
 func ScaleRC(clientset clientset.Interface, scalesGetter scaleclient.ScalesGetter, ns, name string, size uint, wait bool) error {
-	return ScaleResource(clientset, scalesGetter, ns, name, size, wait, api.Kind("ReplicationController"), api.Resource("replicationcontrollers"))
+	return ScaleResource(clientset, scalesGetter, ns, name, size, wait, api.Kind("ReplicationController"), api.SchemeGroupVersion.WithResource("replicationcontrollers"))
 }
 
 // RunRC Launches (and verifies correctness) of a Replication Controller

test/e2e/framework/util.go

@@ -2183,10 +2183,10 @@ func ScaleResource(
 	size uint,
 	wait bool,
 	kind schema.GroupKind,
-	gr schema.GroupResource,
+	gvr schema.GroupVersionResource,
 ) error {
 	ginkgo.By(fmt.Sprintf("Scaling %v %s in namespace %s to %d", kind, name, ns, size))
-	if err := testutils.ScaleResourceWithRetries(scalesGetter, ns, name, size, gr); err != nil {
+	if err := testutils.ScaleResourceWithRetries(scalesGetter, ns, name, size, gvr); err != nil {
 		return fmt.Errorf("error while scaling RC %s to %d replicas: %v", name, size, err)
 	}
 	if !wait {

test/e2e/scalability/load.go

@@ -691,7 +691,7 @@ func scaleResource(wg *sync.WaitGroup, config testutils.RunObjectConfig, scaling
 		newSize,
 		true,
 		config.GetKind(),
-		config.GetGroupResource(),
+		config.GetGroupVersionResource(),
 	),
 		fmt.Sprintf("scaling %v %v", config.GetKind(), config.GetName()))
 

test/utils/runners.go

@@ -107,6 +107,7 @@ type RunObjectConfig interface {
 	GetReplicas() int
 	GetLabelValue(string) (string, bool)
 	GetGroupResource() schema.GroupResource
+	GetGroupVersionResource() schema.GroupVersionResource
 }
 
 type RCConfig struct {
@@ -298,6 +299,10 @@ func (config *DeploymentConfig) GetGroupResource() schema.GroupResource {
 	return extensionsinternal.Resource("deployments")
 }
 
+func (config *DeploymentConfig) GetGroupVersionResource() schema.GroupVersionResource {
+	return extensionsinternal.SchemeGroupVersion.WithResource("deployments")
+}
+
 func (config *DeploymentConfig) create() error {
 	deployment := &apps.Deployment{
 		ObjectMeta: metav1.ObjectMeta{
@@ -374,6 +379,10 @@ func (config *ReplicaSetConfig) GetGroupResource() schema.GroupResource {
 	return extensionsinternal.Resource("replicasets")
 }
 
+func (config *ReplicaSetConfig) GetGroupVersionResource() schema.GroupVersionResource {
+	return extensionsinternal.SchemeGroupVersion.WithResource("replicasets")
+}
+
 func (config *ReplicaSetConfig) create() error {
 	rs := &apps.ReplicaSet{
 		ObjectMeta: metav1.ObjectMeta{
@@ -446,6 +455,10 @@ func (config *JobConfig) GetGroupResource() schema.GroupResource {
 	return batchinternal.Resource("jobs")
 }
 
+func (config *JobConfig) GetGroupVersionResource() schema.GroupVersionResource {
+	return batchinternal.SchemeGroupVersion.WithResource("jobs")
+}
+
 func (config *JobConfig) create() error {
 	job := &batch.Job{
 		ObjectMeta: metav1.ObjectMeta{
@@ -522,6 +535,10 @@ func (config *RCConfig) GetGroupResource() schema.GroupResource {
 	return api.Resource("replicationcontrollers")
 }
 
+func (config *RCConfig) GetGroupVersionResource() schema.GroupVersionResource {
+	return api.SchemeGroupVersion.WithResource("replicationcontrollers")
+}
+
 func (config *RCConfig) GetClient() clientset.Interface {
 	return config.Client
 }

test/utils/update_resources.go

@@ -45,17 +45,17 @@ func RetryErrorCondition(condition wait.ConditionFunc) wait.ConditionFunc {
 	}
 }
 
-func ScaleResourceWithRetries(scalesGetter scaleclient.ScalesGetter, namespace, name string, size uint, gr schema.GroupResource) error {
+func ScaleResourceWithRetries(scalesGetter scaleclient.ScalesGetter, namespace, name string, size uint, gvr schema.GroupVersionResource) error {
 	scaler := scale.NewScaler(scalesGetter)
 	preconditions := &scale.ScalePrecondition{
 		Size:            -1,
 		ResourceVersion: "",
 	}
 	waitForReplicas := scale.NewRetryParams(waitRetryInterval, waitRetryTimeout)
-	cond := RetryErrorCondition(scale.ScaleCondition(scaler, preconditions, namespace, name, size, nil, gr))
+	cond := RetryErrorCondition(scale.ScaleCondition(scaler, preconditions, namespace, name, size, nil, gvr))
 	err := wait.PollImmediate(updateRetryInterval, updateRetryTimeout, cond)
 	if err == nil {
-		err = scale.WaitForScaleHasDesiredReplicas(scalesGetter, gr, name, namespace, size, waitForReplicas)
+		err = scale.WaitForScaleHasDesiredReplicas(scalesGetter, gvr.GroupResource(), name, namespace, size, waitForReplicas)
 	}
 	if err != nil {
 		return fmt.Errorf("Error while scaling %s to %d replicas: %v", name, size, err)