Do not create selector and namespaces in a loop where possible

Change-Id: Ib8e62df92a3ea6b8ee6b90cb0b73af71332481d7

plugin/pkg/scheduler/algorithm/predicates/predicates.go

@@ -909,11 +909,13 @@ func (c *PodAffinityChecker) InterPodAffinityMatches(pod *v1.Pod, meta interface
 // TODO: Do we really need any pod matching, or all pods matching? I think the latter.
 func (c *PodAffinityChecker) anyPodMatchesPodAffinityTerm(pod *v1.Pod, allPods []*v1.Pod, node *v1.Node, term *v1.PodAffinityTerm) (bool, bool, error) {
 	matchingPodExists := false
-	for _, existingPod := range allPods {
-		match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(existingPod, pod, term)
+	namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(pod, term)
+	selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 	if err != nil {
-			return false, matchingPodExists, err
+		return false, false, err
 	}
+	for _, existingPod := range allPods {
+		match := priorityutil.PodMatchesTermsNamespaceAndSelector(existingPod, namespaces, selector)
 		if match {
 			matchingPodExists = true
 			existingPodNode, err := c.info.GetNodeInfo(existingPod.Spec.NodeName)
@@ -994,11 +996,13 @@ func getMatchingAntiAffinityTerms(pod *v1.Pod, nodeInfoMap map[string]*scheduler
 				continue
 			}
 			for _, term := range getPodAntiAffinityTerms(affinity.PodAntiAffinity) {
-				match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, existingPod, &term)
+				namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(pod, &term)
+				selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 				if err != nil {
 					catchError(err)
 					return
 				}
+				match := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, namespaces, selector)
 				if match {
 					nodeResult = append(nodeResult, matchingPodAntiAffinityTerm{term: &term, node: node})
 				}
@@ -1025,10 +1029,12 @@ func (c *PodAffinityChecker) getMatchingAntiAffinityTerms(pod *v1.Pod, allPods [
 				return nil, err
 			}
 			for _, term := range getPodAntiAffinityTerms(affinity.PodAntiAffinity) {
-				match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, existingPod, &term)
+				namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(existingPod, &term)
+				selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 				if err != nil {
 					return nil, err
 				}
+				match := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, namespaces, selector)
 				if match {
 					result = append(result, matchingPodAntiAffinityTerm{term: &term, node: existingPodNode})
 				}
@@ -1090,8 +1096,15 @@ func (c *PodAffinityChecker) satisfiesPodsAffinityAntiAffinity(pod *v1.Pod, node
 			// If the requirement matches a pod's own labels are namespace, and there are
 			// no other such pods, then disregard the requirement. This is necessary to
 			// not block forever because the first pod of the collection can't be scheduled.
-			match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, pod, &term)
-			if err != nil || !match || matchingPodExists {
+			namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(pod, &term)
+			selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
+			if err != nil {
+				glog.V(10).Infof("Cannot parse selector on term %v for pod %v. Details %v",
+					term, podName(pod), err)
+				return false
+			}
+			match := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, namespaces, selector)
+			if !match || matchingPodExists {
 				glog.V(10).Infof("Cannot schedule pod %+v onto node %v,because of PodAffinityTerm %v, err: %v",
 					podName(pod), node.Name, term, err)
 				return false

plugin/pkg/scheduler/algorithm/priorities/interpod_affinity.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api/v1"
+	metav1 "k8s.io/kubernetes/pkg/apis/meta/v1"
 	"k8s.io/kubernetes/pkg/util/workqueue"
 	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
 	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
@@ -84,11 +85,13 @@ func (p *podAffinityPriorityMap) setError(err error) {
 }
 
 func (p *podAffinityPriorityMap) processTerm(term *v1.PodAffinityTerm, podDefiningAffinityTerm, podToCheck *v1.Pod, fixedNode *v1.Node, weight float64) {
-	match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(podToCheck, podDefiningAffinityTerm, term)
+	namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(podDefiningAffinityTerm, term)
+	selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 	if err != nil {
 		p.setError(err)
 		return
 	}
+	match := priorityutil.PodMatchesTermsNamespaceAndSelector(podToCheck, namespaces, selector)
 	if match {
 		func() {
 			p.Lock()

plugin/pkg/scheduler/algorithm/priorities/util/BUILD

@@ -20,7 +20,6 @@ go_library(
     tags = ["automanaged"],
     deps = [
         "//pkg/api/v1:go_default_library",
-        "//pkg/apis/meta/v1:go_default_library",
         "//pkg/labels:go_default_library",
         "//pkg/util/sets:go_default_library",
     ],

plugin/pkg/scheduler/algorithm/priorities/util/topologies.go

@@ -18,7 +18,6 @@ package util
 
 import (
 	"k8s.io/kubernetes/pkg/api/v1"
-	metav1 "k8s.io/kubernetes/pkg/apis/meta/v1"
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/util/sets"
 )
@@ -27,7 +26,7 @@ import (
 // according to the namespaces indicated in podAffinityTerm.
 // 1. If the namespaces is nil considers the given pod's namespace
 // 2. If the namespaces is empty list then considers all the namespaces
-func getNamespacesFromPodAffinityTerm(pod *v1.Pod, podAffinityTerm v1.PodAffinityTerm) sets.String {
+func GetNamespacesFromPodAffinityTerm(pod *v1.Pod, podAffinityTerm *v1.PodAffinityTerm) sets.String {
 	names := sets.String{}
 	if podAffinityTerm.Namespaces == nil {
 		names.Insert(pod.Namespace)
@@ -39,17 +38,15 @@ func getNamespacesFromPodAffinityTerm(pod *v1.Pod, podAffinityTerm v1.PodAffinit
 
 // PodMatchesTermsNamespaceAndSelector returns true if the given <pod>
 // matches the namespace and selector defined by <affinityPod>`s <term>.
-func PodMatchesTermsNamespaceAndSelector(pod *v1.Pod, affinityPod *v1.Pod, term *v1.PodAffinityTerm) (bool, error) {
-	namespaces := getNamespacesFromPodAffinityTerm(affinityPod, *term)
+func PodMatchesTermsNamespaceAndSelector(pod *v1.Pod, namespaces sets.String, selector labels.Selector) bool {
 	if len(namespaces) != 0 && !namespaces.Has(pod.Namespace) {
-		return false, nil
+		return false
 	}
 
-	selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
-	if err != nil || !selector.Matches(labels.Set(pod.Labels)) {
-		return false, err
+	if !selector.Matches(labels.Set(pod.Labels)) {
+		return false
 	}
-	return true, nil
+	return true
 }
 
 // nodesHaveSameTopologyKeyInternal checks if nodeA and nodeB have same label value with given topologyKey as label key.