Merge pull request #55221 from CaoShuFeng/priority

Automatic merge from submit-queue (batch tested with PRs 54987, 55221, 54099, 55144, 54215). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. not calculate new priority when user update other spec of a pod motivation of this change: If we update the priority, pod validation mechanism will prevent this update request, this is not expected. **Release note**: ``` Priority admission controller: not calculate new priority when user update a pod ```

Merge pull request #55221 from CaoShuFeng/priority
ecdf31d5 · Kubernetes Submit Queue · GitHub · fc61d9bc · 1440949d · ecdf31d5
Unverified Commit ecdf31d5 authored Nov 10, 2017 by Kubernetes Submit Queue Committed by GitHub Nov 10, 2017
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admission.go plugin/pkg/admission/priority/admission.go +2 -2

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--- a/plugin/pkg/admission/priority/admission.go
+++ b/plugin/pkg/admission/priority/admission.go
@@ -105,6 +105,7 @@ var (
 )
 // Admit checks Pods and admits or rejects them. It also resolves the priority of pods based on their PriorityClass.
+// Note that pod validation mechanism prevents update of a pod priority.
 func (p *PriorityPlugin) Admit(a admission.Attributes) error {
 	operation := a.GetOperation()
 	// Ignore all calls to subresources
@@ -114,7 +115,7 @@ func (p *PriorityPlugin) Admit(a admission.Attributes) error {
 	switch a.GetResource().GroupResource() {
 	case podResource:
-		if operation == admission.Create || operation == admission.Update {
+		if operation == admission.Create {
 			return p.admitPod(a)
 		}
 		return nil
@@ -149,7 +150,6 @@ func (p *PriorityPlugin) Validate(a admission.Attributes) error {
 }
 // admitPod makes sure a new pod does not set spec.Priority field. It also makes sure that the PriorityClassName exists if it is provided and resolves the pod priority from the PriorityClassName.
-// Note that pod validation mechanism prevents update of a pod priority.
 func (p *PriorityPlugin) admitPod(a admission.Attributes) error {
 	operation := a.GetOperation()
 	pod, ok := a.GetObject().(*api.Pod)