Fix PV counter predicate in eclass

plugin/pkg/scheduler/core/equivalence_cache.go

@@ -188,6 +188,23 @@ func (ec *EquivalenceCache) InvalidateCachedPredicateItemForPodAdd(pod *v1.Pod,
 
 	// GeneralPredicates: will always be affected by adding a new pod
 	invalidPredicates := sets.NewString("GeneralPredicates")
+
+	// MaxPDVolumeCountPredicate: we check the volumes of pod to make decision.
+	for _, vol := range pod.Spec.Volumes {
+		if vol.PersistentVolumeClaim != nil {
+			invalidPredicates.Insert("MaxEBSVolumeCount", "MaxGCEPDVolumeCount", "MaxAzureDiskVolumeCount")
+		} else {
+			if vol.AWSElasticBlockStore != nil {
+				invalidPredicates.Insert("MaxEBSVolumeCount")
+			}
+			if vol.GCEPersistentDisk != nil {
+				invalidPredicates.Insert("MaxGCEPDVolumeCount")
+			}
+			if vol.AzureDisk != nil {
+				invalidPredicates.Insert("MaxAzureDiskVolumeCount")
+			}
+		}
+	}
 	ec.InvalidateCachedPredicateItem(nodeName, invalidPredicates)
 }
 

plugin/pkg/scheduler/factory/factory.go

@@ -72,10 +72,10 @@ const (
 
 var (
 	serviceAffinitySet            = sets.NewString("ServiceAffinity")
-	maxPDVolumeCountPredicateSet = sets.NewString("MaxPDVolumeCountPredicate")
 	matchInterPodAffinitySet      = sets.NewString("MatchInterPodAffinity")
 	generalPredicatesSets         = sets.NewString("GeneralPredicates")
 	noDiskConflictSet             = sets.NewString("NoDiskConflict")
+	maxPDVolumeCountPredicateKeys = []string{"MaxGCEPDVolumeCount", "MaxAzureDiskVolumeCount", "MaxEBSVolumeCount"}
 )
 
 // configFactory is the default implementation of the scheduler.Configurator interface.
@@ -384,7 +384,11 @@ func (c *configFactory) onPvDelete(obj interface{}) {
 }
 
 func (c *configFactory) invalidatePredicatesForPv(pv *v1.PersistentVolume) {
-	invalidPredicates := sets.NewString("MaxPDVolumeCountPredicate")
+	// You could have a PVC that points to a PV, but the PV object doesn't exist.
+	// So when the PV object gets added, we can recount.
+	invalidPredicates := sets.NewString()
+
+	// PV types which impact MaxPDVolumeCountPredicate
 	if pv.Spec.AWSElasticBlockStore != nil {
 		invalidPredicates.Insert("MaxEBSVolumeCount")
 	}
@@ -395,6 +399,14 @@ func (c *configFactory) invalidatePredicatesForPv(pv *v1.PersistentVolume) {
 		invalidPredicates.Insert("MaxAzureDiskVolumeCount")
 	}
 
+	// If PV contains zone related label, it may impact cached NoVolumeZoneConflict
+	for k := range pv.ObjectMeta.Labels {
+		if k == kubeletapis.LabelZoneFailureDomain || k == kubeletapis.LabelZoneRegion {
+			invalidPredicates.Insert("NoVolumeZoneConflict")
+			break
+		}
+	}
+
 	if utilfeature.DefaultFeatureGate.Enabled(features.VolumeScheduling) {
 		// Add/delete impacts the available PVs to choose from
 		invalidPredicates.Insert(predicates.CheckVolumeBinding)
@@ -458,24 +470,34 @@ func (c *configFactory) onPvcDelete(obj interface{}) {
 }
 
 func (c *configFactory) invalidatePredicatesForPvc(pvc *v1.PersistentVolumeClaim) {
-	if pvc.Spec.VolumeName != "" {
+	// We need to do this here because the ecache uses PVC uid as part of equivalence hash of pod
-		c.equivalencePodCache.InvalidateCachedPredicateItemOfAllNodes(maxPDVolumeCountPredicateSet)
+	// The binded volume type may change
+	invalidPredicates := sets.NewString(maxPDVolumeCountPredicateKeys...)
+	// // The binded volume's label may change
+	invalidPredicates.Insert("NoVolumeZoneConflict")
+
+	if utilfeature.DefaultFeatureGate.Enabled(features.VolumeScheduling) {
+		// Add/delete impacts the available PVs to choose from
+		invalidPredicates.Insert(predicates.CheckVolumeBinding)
 	}
+	c.equivalencePodCache.InvalidateCachedPredicateItemOfAllNodes(invalidPredicates)
 }
 
 func (c *configFactory) invalidatePredicatesForPvcUpdate(old, new *v1.PersistentVolumeClaim) {
 	invalidPredicates := sets.NewString()
 
-	if utilfeature.DefaultFeatureGate.Enabled(features.VolumeScheduling) {
 	if old.Spec.VolumeName != new.Spec.VolumeName {
+		if utilfeature.DefaultFeatureGate.Enabled(features.VolumeScheduling) {
 			// PVC volume binding has changed
 			invalidPredicates.Insert(predicates.CheckVolumeBinding)
 		}
+		// The binded volume type may change
+		invalidPredicates.Insert(maxPDVolumeCountPredicateKeys...)
+		// The binded volume's label may change
+		invalidPredicates.Insert("NoVolumeZoneConflict")
 	}
 
-	if invalidPredicates.Len() > 0 {
 	c.equivalencePodCache.InvalidateCachedPredicateItemOfAllNodes(invalidPredicates)
-	}
 }
 
 func (c *configFactory) onServiceAdd(obj interface{}) {
@@ -541,7 +563,7 @@ func (c *configFactory) addPodToCache(obj interface{}) {
 	c.podQueue.AssignedPodAdded(pod)
 
 	// NOTE: Updating equivalence cache of addPodToCache has been
-	// handled optimistically in InvalidateCachedPredicateItemForPodAdd.
+	// handled optimistically in: plugin/pkg/scheduler/scheduler.go#assume()
 }
 
 func (c *configFactory) updatePodInCache(oldObj, newObj interface{}) {