optimize pod affinity when predicate

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

@@ -1096,6 +1096,11 @@ 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.
+			if 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
+			}
 			namespaces := priorityutil.GetNamespacesFromPodAffinityTerm(pod, &term)
 			selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
 			if err != nil {
@@ -1104,7 +1109,7 @@ func (c *PodAffinityChecker) satisfiesPodsAffinityAntiAffinity(pod *v1.Pod, node
 				return false
 			}
 			match := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, namespaces, selector)
-			if !match || matchingPodExists {
+			if !match {
 				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