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scheduler: fail the volume attach limit when PVC is missing

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Previously, the situation was ignored, which might have had the effect that Pod
scheduling continued (?) even though the Pod+PVC weren't known to be in an
acceptable state.
This commit is contained in:
Patrick Ohly 2021-09-06 12:05:24 +02:00
parent 1e26115df5
commit 1d181ad84f
4 changed files with 19 additions and 3 deletions
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8
pkg/scheduler/framework/plugins/nodevolumelimits/csi.go
View File

@ -180,6 +180,14 @@ func (pl *CSILimits) filterAttachableVolumes(
pvc, err := pl.pvcLister.PersistentVolumeClaims(pod.Namespace).Get(pvcName)
if err != nil {
if newPod {
// The PVC is required to proceed with
// scheduling of a new pod because it cannot
// run without it. Bail out immediately.
return fmt.Errorf("looking up PVC %s/%s: %v", pod.Namespace, pvcName, err)
}
// If the PVC is invalid, we don't count the volume because
// there's no guarantee that it belongs to the running predicate.
klog.V(5).InfoS("Unable to look up PVC info", "PVC", fmt.Sprintf("%s/%s", pod.Namespace, pvcName))
continue
}

1
pkg/scheduler/framework/plugins/nodevolumelimits/csi_test.go
View File

@ -559,6 +559,7 @@ func TestCSILimits(t *testing.T) {
ephemeralEnabled: true,
driverNames: []string{ebsCSIDriverName},
test: "ephemeral volume missing",
wantStatus: framework.NewStatus(framework.Error, `looking up PVC test/abc-xyz: persistentvolumeclaim "abc-xyz" not found`),
},
{
newPod: ephemeralVolumePod,

12
pkg/scheduler/framework/plugins/nodevolumelimits/non_csi.go
View File

@ -221,7 +221,7 @@ func (pl *nonCSILimits) Filter(ctx context.Context, _ *framework.CycleState, pod
}
newVolumes := make(sets.String)
if err := pl.filterVolumes(pod, newVolumes); err != nil {
if err := pl.filterVolumes(pod, true /* new pod */, newVolumes); err != nil {
return framework.AsStatus(err)
}
@ -254,7 +254,7 @@ func (pl *nonCSILimits) Filter(ctx context.Context, _ *framework.CycleState, pod
// count unique volumes
existingVolumes := make(sets.String)
for _, existingPod := range nodeInfo.Pods {
if err := pl.filterVolumes(existingPod.Pod, existingVolumes); err != nil {
if err := pl.filterVolumes(existingPod.Pod, false /* existing pod */, existingVolumes); err != nil {
return framework.AsStatus(err)
}
}
@ -278,7 +278,7 @@ func (pl *nonCSILimits) Filter(ctx context.Context, _ *framework.CycleState, pod
return nil
}
func (pl *nonCSILimits) filterVolumes(pod *v1.Pod, filteredVolumes sets.String) error {
func (pl *nonCSILimits) filterVolumes(pod *v1.Pod, newPod bool, filteredVolumes sets.String) error {
volumes := pod.Spec.Volumes
for i := range volumes {
vol := &volumes[i]
@ -319,6 +319,12 @@ func (pl *nonCSILimits) filterVolumes(pod *v1.Pod, filteredVolumes sets.String)
pvc, err := pl.pvcLister.PersistentVolumeClaims(pod.Namespace).Get(pvcName)
if err != nil {
if newPod {
// The PVC is required to proceed with
// scheduling of a new pod because it cannot
// run without it. Bail out immediately.
return fmt.Errorf("looking up PVC %s/%s: %v", pod.Namespace, pvcName, err)
}
// If the PVC is invalid, we don't count the volume because
// there's no guarantee that it belongs to the running predicate.
klog.V(4).InfoS("Unable to look up PVC info, assuming PVC doesn't match predicate when counting limits", "PVC", fmt.Sprintf("%s/%s", pod.Namespace, pvcName), "err", err)

1
pkg/scheduler/framework/plugins/nodevolumelimits/non_csi_test.go
View File

@ -95,6 +95,7 @@ func TestEphemeralLimits(t *testing.T) {
newPod: ephemeralVolumePod,
ephemeralEnabled: true,
test: "volume missing",
wantStatus: framework.NewStatus(framework.Error, `looking up PVC test/abc-xyz: persistentvolumeclaim "abc-xyz" not found`),
},
{
newPod: ephemeralVolumePod,