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Fix a bug where the target pod doesn't become schedulable within 5 minutes when a deleted pod uses the same PVC with the ReadWriteOncePod access mode. (#126263)
Co-authored-by: Kensei Nakada <handbomusic@gmail.com>
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@ -362,7 +362,6 @@ func (pl *VolumeRestrictions) isSchedulableAfterPersistentVolumeClaimAdded(logge
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// isSchedulableAfterPodDeleted is invoked whenever a pod deleted,
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// It checks whether the deleted pod will conflict with volumes of other pods on the same node
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// TODO If we observe good throughput, we will add a check for conflicts between the deleted Pod and the readWriteOncePodPVC of the current Pod.
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func (pl *VolumeRestrictions) isSchedulableAfterPodDeleted(logger klog.Logger, pod *v1.Pod, oldObj, newObj interface{}) (framework.QueueingHint, error) {
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deletedPod, _, err := util.As[*v1.Pod](oldObj, newObj)
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if err != nil {
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@ -375,9 +374,30 @@ func (pl *VolumeRestrictions) isSchedulableAfterPodDeleted(logger klog.Logger, p
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nodeInfo := framework.NewNodeInfo(deletedPod)
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if !satisfyVolumeConflicts(pod, nodeInfo) {
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logger.V(5).Info("Pod with the volume that the target pod requires was deleted, which might make this pod schedulable", "pod", klog.KObj(pod), "deletedPod", klog.KObj(deletedPod))
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return framework.Queue, nil
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}
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// Return Queue if a deleted pod uses the same PVC since the pod may be unschedulable due to the ReadWriteOncePod access mode of the PVC.
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//
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// For now, we don't actually fetch PVC and check the access mode because that operation could be expensive.
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// Once the observability around QHint is established,
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// we may want to do that depending on how much the operation would impact the QHint latency negatively.
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// https://github.com/kubernetes/kubernetes/issues/124566
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claims := sets.New[string]()
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for _, volume := range pod.Spec.Volumes {
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if volume.PersistentVolumeClaim != nil {
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claims.Insert(volume.PersistentVolumeClaim.ClaimName)
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}
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}
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for _, volume := range deletedPod.Spec.Volumes {
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if volume.PersistentVolumeClaim != nil && claims.Has(volume.PersistentVolumeClaim.ClaimName) {
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logger.V(5).Info("Pod with the same PVC that the target pod requires was deleted, which might make this pod schedulable", "pod", klog.KObj(pod), "deletedPod", klog.KObj(deletedPod))
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return framework.Queue, nil
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}
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}
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logger.V(5).Info("An irrelevant Pod was deleted, which doesn't make this pod schedulable", "pod", klog.KObj(pod), "deletedPod", klog.KObj(deletedPod))
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return framework.QueueSkip, nil
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}
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@ -640,6 +640,22 @@ func Test_isSchedulableAfterPodDeleted(t *testing.T) {
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expectedHint: framework.QueueSkip,
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expectedErr: false,
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},
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"queue-has-same-claim": {
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pod: st.MakePod().Name("pod1").PVC("claim-rwop").Obj(),
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oldObj: st.MakePod().Name("pod2").PVC("claim-rwop").Obj(),
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existingPods: []*v1.Pod{},
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existingPVC: &v1.PersistentVolumeClaim{},
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expectedHint: framework.Queue,
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expectedErr: false,
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},
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"skip-no-same-claim": {
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pod: st.MakePod().Name("pod1").PVC("claim-1-rwop").Obj(),
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oldObj: st.MakePod().Name("pod2").PVC("claim-2-rwop").Obj(),
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existingPods: []*v1.Pod{},
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existingPVC: &v1.PersistentVolumeClaim{},
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expectedHint: framework.QueueSkip,
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expectedErr: false,
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},
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}
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for name, tc := range testcases {
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