Merge pull request kubernetes#91099 from snowplayfire/skip_unnecessary_scheduling

skip unnecessary scheduling attempt when pod has its Finalizers updated

Author: k8s-ci-robot

pkg/scheduler/eventhandlers.go

@@ -306,7 +306,7 @@ func responsibleForPod(pod *v1.Pod, profiles profile.Map) bool {
 // skipPodUpdate checks whether the specified pod update should be ignored.
 // This function will return true if
 //   - The pod has already been assumed, AND
-//   - The pod has only its ResourceVersion, Spec.NodeName and/or Annotations
+//   - The pod has only its ResourceVersion, Spec.NodeName, Annotations, ManagedFields and/or Finalizers
 //     updated.
 func (sched *Scheduler) skipPodUpdate(pod *v1.Pod) bool {
 	// Non-assumed pods should never be skipped.
@@ -343,6 +343,8 @@ func (sched *Scheduler) skipPodUpdate(pod *v1.Pod) bool {
 		// Same as above, when annotations are modified with ServerSideApply,
 		// ManagedFields may also change and must be excluded
 		p.ManagedFields = nil
+		// Finalizers must be excluded because scheduled result can not be affected
+		p.Finalizers = nil
 		return p
 	}
 	assumedPodCopy, podCopy := f(assumedPod), f(pod)

pkg/scheduler/eventhandlers_test.go

@@ -183,6 +183,27 @@ func TestSkipPodUpdate(t *testing.T) {
 			},
 			expected: false,
 		},
+		{
+			name: "with changes on Finalizers",
+			pod: &v1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:       "pod-0",
+					Finalizers: []string{"a", "b"},
+				},
+			},
+			isAssumedPodFunc: func(*v1.Pod) bool {
+				return true
+			},
+			getPodFunc: func(*v1.Pod) *v1.Pod {
+				return &v1.Pod{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:       "pod-0",
+						Finalizers: []string{"c", "d"},
+					},
+				}
+			},
+			expected: true,
+		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			c := &Scheduler{