tracking nodes with pod with affinity

Author: ahg-g

pkg/scheduler/algorithm/predicates/metadata.go

@@ -338,13 +338,20 @@ func GetPredicateMetadata(pod *v1.Pod, sharedLister schedulerlisters.SharedListe
 	}
 
 	var allNodes []*schedulernodeinfo.NodeInfo
+	var havePodsWithAffinityNodes []*schedulernodeinfo.NodeInfo
 	if sharedLister != nil {
-		n, err := sharedLister.NodeInfos().List()
+		var err error
+		allNodes, err = sharedLister.NodeInfos().List()
 		if err != nil {
 			klog.Errorf("failed to list NodeInfos: %v", err)
 			return nil
 		}
-		allNodes = n
+		havePodsWithAffinityNodes, err = sharedLister.NodeInfos().HavePodsWithAffinityList()
+		if err != nil {
+			klog.Errorf("failed to list NodeInfos: %v", err)
+			return nil
+		}
+
 	}
 
 	// evenPodsSpreadMetadata represents how existing pods match "pod"
@@ -355,7 +362,7 @@ func GetPredicateMetadata(pod *v1.Pod, sharedLister schedulerlisters.SharedListe
 		return nil
 	}
 
-	podAffinityMetadata, err := getPodAffinityMetadata(pod, allNodes)
+	podAffinityMetadata, err := getPodAffinityMetadata(pod, allNodes, havePodsWithAffinityNodes)
 	if err != nil {
 		klog.Errorf("Error calculating podAffinityMetadata: %v", err)
 		return nil
@@ -387,9 +394,9 @@ func getPodFitsResourcesMetedata(pod *v1.Pod) *podFitsResourcesMetadata {
 	}
 }
 
-func getPodAffinityMetadata(pod *v1.Pod, allNodes []*schedulernodeinfo.NodeInfo) (*podAffinityMetadata, error) {
+func getPodAffinityMetadata(pod *v1.Pod, allNodes []*schedulernodeinfo.NodeInfo, havePodsWithAffinityNodes []*schedulernodeinfo.NodeInfo) (*podAffinityMetadata, error) {
 	// existingPodAntiAffinityMap will be used later for efficient check on existing pods' anti-affinity
-	existingPodAntiAffinityMap, err := getTPMapMatchingExistingAntiAffinity(pod, allNodes)
+	existingPodAntiAffinityMap, err := getTPMapMatchingExistingAntiAffinity(pod, havePodsWithAffinityNodes)
 	if err != nil {
 		return nil, err
 	}
@@ -759,7 +766,9 @@ func getTPMapMatchingExistingAntiAffinity(pod *v1.Pod, allNodes []*schedulernode
 				errCh.SendErrorWithCancel(err, cancel)
 				return
 			}
-			appendTopologyPairsMaps(existingPodTopologyMaps)
+			if existingPodTopologyMaps != nil {
+				appendTopologyPairsMaps(existingPodTopologyMaps)
+			}
 		}
 	}
 	workqueue.ParallelizeUntil(ctx, 16, len(allNodes), processNode)

pkg/scheduler/algorithm/priorities/interpod_affinity.go

@@ -106,10 +106,17 @@ func (ipa *InterPodAffinity) CalculateInterPodAffinityPriority(pod *v1.Pod, shar
 
 	// pm stores (1) all nodes that should be considered and (2) the so-far computed score for each node.
 	pm := newPodAffinityPriorityMap(nodes)
-	allNodes, err := sharedLister.NodeInfos().List()
+
+	allNodes, err := sharedLister.NodeInfos().HavePodsWithAffinityList()
 	if err != nil {
 		return nil, err
 	}
+	if hasAffinityConstraints || hasAntiAffinityConstraints {
+		allNodes, err = sharedLister.NodeInfos().List()
+		if err != nil {
+			return nil, err
+		}
+	}
 
 	// convert the topology key based weights to the node name based weights
 	var maxCount, minCount int64

pkg/scheduler/core/generic_scheduler.go

@@ -179,7 +179,6 @@ func (g *genericScheduler) snapshot() error {
 // for cluster autoscaler integration.
 func (g *genericScheduler) PredicateMetadataProducer() predicates.PredicateMetadataProducer {
 	return g.predicateMetaProducer
-
 }
 
 // Schedule tries to schedule the given pod to one of the nodes in the node list.

pkg/scheduler/internal/cache/cache.go

@@ -239,10 +239,14 @@ func (cache *schedulerCache) UpdateNodeInfoSnapshot(nodeSnapshot *nodeinfosnapsh
 
 	// Take a snapshot of the nodes order in the tree
 	nodeSnapshot.NodeInfoList = make([]*schedulernodeinfo.NodeInfo, 0, cache.nodeTree.numNodes)
+	nodeSnapshot.HavePodsWithAffinityNodeInfoList = make([]*schedulernodeinfo.NodeInfo, 0, cache.nodeTree.numNodes)
 	for i := 0; i < cache.nodeTree.numNodes; i++ {
 		nodeName := cache.nodeTree.next()
 		if n := nodeSnapshot.NodeInfoMap[nodeName]; n != nil {
 			nodeSnapshot.NodeInfoList = append(nodeSnapshot.NodeInfoList, n)
+			if len(n.PodsWithAffinity()) > 0 {
+				nodeSnapshot.HavePodsWithAffinityNodeInfoList = append(nodeSnapshot.HavePodsWithAffinityNodeInfoList, n)
+			}
 		} else {
 			klog.Errorf("node %q exist in nodeTree but not in NodeInfoMap, this should not happen.", nodeName)
 		}

pkg/scheduler/listers/fake/listers.go

@@ -262,6 +262,12 @@ func (nodes NodeInfoLister) List() ([]*schedulernodeinfo.NodeInfo, error) {
 	return nodes, nil
 }
 
+// HavePodsWithAffinityList is supposed to list nodes with at least one pod with affinity. For the fake lister
+// we just return everything.
+func (nodes NodeInfoLister) HavePodsWithAffinityList() ([]*schedulernodeinfo.NodeInfo, error) {
+	return nodes, nil
+}
+
 // NewNodeInfoLister create a new fake NodeInfoLister from a slice of v1.Nodes.
 func NewNodeInfoLister(nodes []*v1.Node) schedulerlisters.NodeInfoLister {
 	nodeInfoList := make([]*schedulernodeinfo.NodeInfo, len(nodes))

pkg/scheduler/listers/listers.go

@@ -38,6 +38,8 @@ type PodLister interface {
 type NodeInfoLister interface {
 	// Returns the list of NodeInfos.
 	List() ([]*schedulernodeinfo.NodeInfo, error)
+	// Returns the list of NodeInfos of nodes with pods with affinity terms.
+	HavePodsWithAffinityList() ([]*schedulernodeinfo.NodeInfo, error)
 	// Returns the NodeInfo of the given node name.
 	Get(nodeName string) (*schedulernodeinfo.NodeInfo, error)
 }

pkg/scheduler/nodeinfo/snapshot/snapshot.go

@@ -32,7 +32,9 @@ type Snapshot struct {
 	NodeInfoMap map[string]*schedulernodeinfo.NodeInfo
 	// NodeInfoList is the list of nodes as ordered in the cache's nodeTree.
 	NodeInfoList []*schedulernodeinfo.NodeInfo
-	Generation   int64
+	// HavePodsWithAffinityNodeInfoList is the list of nodes with at least one pod declaring affinity terms.
+	HavePodsWithAffinityNodeInfoList []*schedulernodeinfo.NodeInfo
+	Generation                       int64
 }
 
 var _ schedulerlisters.SharedLister = &Snapshot{}
@@ -48,13 +50,18 @@ func NewEmptySnapshot() *Snapshot {
 func NewSnapshot(pods []*v1.Pod, nodes []*v1.Node) *Snapshot {
 	nodeInfoMap := schedulernodeinfo.CreateNodeNameToInfoMap(pods, nodes)
 	nodeInfoList := make([]*schedulernodeinfo.NodeInfo, 0, len(nodes))
+	havePodsWithAffinityNodeInfoList := make([]*schedulernodeinfo.NodeInfo, 0, len(nodes))
 	for _, v := range nodeInfoMap {
 		nodeInfoList = append(nodeInfoList, v)
+		if len(v.PodsWithAffinity()) > 0 {
+			havePodsWithAffinityNodeInfoList = append(havePodsWithAffinityNodeInfoList, v)
+		}
 	}
 
 	s := NewEmptySnapshot()
 	s.NodeInfoMap = nodeInfoMap
 	s.NodeInfoList = nodeInfoList
+	s.HavePodsWithAffinityNodeInfoList = havePodsWithAffinityNodeInfoList
 
 	return s
 }
@@ -119,6 +126,11 @@ func (n *nodeInfoLister) List() ([]*schedulernodeinfo.NodeInfo, error) {
 	return n.snapshot.NodeInfoList, nil
 }
 
+// HavePodsWithAffinityList returns the list of nodes with at least one pods with inter-pod affinity
+func (n *nodeInfoLister) HavePodsWithAffinityList() ([]*schedulernodeinfo.NodeInfo, error) {
+	return n.snapshot.HavePodsWithAffinityNodeInfoList, nil
+}
+
 // Returns the NodeInfo of the given node name.
 func (n *nodeInfoLister) Get(nodeName string) (*schedulernodeinfo.NodeInfo, error) {
 	if v, ok := n.snapshot.NodeInfoMap[nodeName]; ok {