Golang api.GetAffinityFromPodAnnotations函數代碼示例

func hasPodAffinityConstraints(pod *api.Pod) bool {
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil || affinity == nil {
		return false
	}
	return affinity.PodAffinity != nil || affinity.PodAntiAffinity != nil
}

func (c *PodAffinityChecker) getMatchingAntiAffinityTerms(pod *api.Pod, allPods []*api.Pod) ([]matchingPodAntiAffinityTerm, error) {
	var result []matchingPodAntiAffinityTerm
	for _, existingPod := range allPods {
		affinity, err := api.GetAffinityFromPodAnnotations(existingPod.Annotations)
		if err != nil {
			return nil, err
		}
		if affinity != nil && affinity.PodAntiAffinity != nil {
			existingPodNode, err := c.info.GetNodeInfo(existingPod.Spec.NodeName)
			if err != nil {
				return nil, err
			}
			for _, term := range getPodAntiAffinityTerms(affinity.PodAntiAffinity) {
				match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, existingPod, &term)
				if err != nil {
					return nil, err
				}
				if match {
					result = append(result, matchingPodAntiAffinityTerm{term: &term, node: existingPodNode})
				}
			}
		}
	}
	return result, nil
}

// Admit will deny any pod that defines AntiAffinity topology key other than metav1.LabelHostname i.e. "kubernetes.io/hostname"
// in  requiredDuringSchedulingRequiredDuringExecution and requiredDuringSchedulingIgnoredDuringExecution.
func (p *plugin) Admit(attributes admission.Attributes) (err error) {
	// Ignore all calls to subresources or resources other than pods.
	if len(attributes.GetSubresource()) != 0 || attributes.GetResource().GroupResource() != api.Resource("pods") {
		return nil
	}
	pod, ok := attributes.GetObject().(*api.Pod)
	if !ok {
		return apierrors.NewBadRequest("Resource was marked with kind Pod but was unable to be converted")
	}
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		glog.V(5).Infof("Invalid Affinity detected, but we will leave handling of this to validation phase")
		return nil
	}
	if affinity != nil && affinity.PodAntiAffinity != nil {
		var podAntiAffinityTerms []api.PodAffinityTerm
		if len(affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
			podAntiAffinityTerms = affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution
		}
		// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
		//if len(affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
		//        podAntiAffinityTerms = append(podAntiAffinityTerms, affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
		//}
		for _, v := range podAntiAffinityTerms {
			if v.TopologyKey != metav1.LabelHostname {
				return apierrors.NewForbidden(attributes.GetResource().GroupResource(), pod.Name, fmt.Errorf("affinity.PodAntiAffinity.RequiredDuringScheduling has TopologyKey %v but only key %v is allowed", v.TopologyKey, metav1.LabelHostname))
			}
		}
	}
	return nil
}

func (checker *PodAffinityChecker) InterPodAffinityMatches(pod *api.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, error) {
	node := nodeInfo.Node()
	if node == nil {
		return false, fmt.Errorf("node not found")
	}
	allPods, err := checker.podLister.List(labels.Everything())
	if err != nil {
		return false, err
	}
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return false, err
	}

	// Check if the current node match the inter-pod affinity scheduling constraints.
	// Hard inter-pod affinity is not symmetric, check only when affinity.PodAffinity exists.
	if affinity.PodAffinity != nil {
		if !checker.NodeMatchesHardPodAffinity(pod, allPods, node, affinity.PodAffinity) {
			return false, ErrPodAffinityNotMatch
		}
	}

	// Hard inter-pod anti-affinity is symmetric, we should always check it.
	if !checker.NodeMatchesHardPodAntiAffinity(pod, allPods, node, affinity.PodAntiAffinity) {
		return false, ErrPodAffinityNotMatch
	}

	return true, nil
}

// Admit will deny any pod that defines AntiAffinity topology key other than unversioned.LabelHostname i.e. "kubernetes.io/hostname"
// in  requiredDuringSchedulingRequiredDuringExecution and requiredDuringSchedulingIgnoredDuringExecution.
func (p *plugin) Admit(attributes admission.Attributes) (err error) {
	if attributes.GetResource().GroupResource() != api.Resource("pods") {
		return nil
	}
	pod, ok := attributes.GetObject().(*api.Pod)
	if !ok {
		return apierrors.NewBadRequest("Resource was marked with kind Pod but was unable to be converted")
	}
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		// this is validated later
		return nil
	}
	if affinity.PodAntiAffinity != nil {
		var podAntiAffinityTerms []api.PodAffinityTerm
		if len(affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
			podAntiAffinityTerms = affinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution
		}
		// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
		//if len(affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
		//        podAntiAffinityTerms = append(podAntiAffinityTerms, affinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
		//}
		for _, v := range podAntiAffinityTerms {
			if v.TopologyKey != unversioned.LabelHostname {
				return apierrors.NewForbidden(attributes.GetResource().GroupResource(), pod.Name, fmt.Errorf("affinity.PodAntiAffinity.RequiredDuringScheduling has TopologyKey %v but only key %v is allowed", v.TopologyKey, unversioned.LabelHostname))
			}
		}
	}
	return nil
}

func (c *PodAffinityChecker) InterPodAffinityMatches(pod *api.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
	node := nodeInfo.Node()
	if node == nil {
		return false, nil, fmt.Errorf("node not found")
	}
	if !c.satisfiesExistingPodsAntiAffinity(pod, meta, node) {
		return false, []algorithm.PredicateFailureReason{ErrPodAffinityNotMatch}, nil
	}

	// Now check if <pod> requirements will be satisfied on this node.
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return false, nil, err
	}
	if affinity == nil || (affinity.PodAffinity == nil && affinity.PodAntiAffinity == nil) {
		return true, nil, nil
	}
	if !c.satisfiesPodsAffinityAntiAffinity(pod, node, affinity) {
		return false, []algorithm.PredicateFailureReason{ErrPodAffinityNotMatch}, nil
	}

	if glog.V(10) {
		// We explicitly don't do glog.V(10).Infof() to avoid computing all the parameters if this is
		// not logged. There is visible performance gain from it.
		glog.Infof("Schedule Pod %+v on Node %+v is allowed, pod (anti)affinity constraints satisfied",
			podName(pod), node.Name)
	}
	return true, nil, nil
}

// CalculateNodeAffinityPriority prioritizes nodes according to node affinity scheduling preferences
// indicated in PreferredDuringSchedulingIgnoredDuringExecution. Each time a node match a preferredSchedulingTerm,
// it will a get an add of preferredSchedulingTerm.Weight. Thus, the more preferredSchedulingTerms
// the node satisfies and the more the preferredSchedulingTerm that is satisfied weights, the higher
// score the node gets.
func CalculateNodeAffinityPriority(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodeLister algorithm.NodeLister) (schedulerapi.HostPriorityList, error) {
	nodes, err := nodeLister.List()
	if err != nil {
		return nil, err
	}

	var maxCount float64
	counts := make(map[string]float64, len(nodes.Items))

	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return nil, err
	}

	// A nil element of PreferredDuringSchedulingIgnoredDuringExecution matches no objects.
	// An element of PreferredDuringSchedulingIgnoredDuringExecution that refers to an
	// empty PreferredSchedulingTerm matches all objects.
	if affinity.NodeAffinity != nil && affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution != nil {
		// Match PreferredDuringSchedulingIgnoredDuringExecution term by term.
		for _, preferredSchedulingTerm := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
			if preferredSchedulingTerm.Weight == 0 {
				continue
			}

			nodeSelector, err := api.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
			if err != nil {
				return nil, err
			}

			for _, node := range nodes.Items {
				if nodeSelector.Matches(labels.Set(node.Labels)) {
					counts[node.Name] += float64(preferredSchedulingTerm.Weight)
				}

				if counts[node.Name] > maxCount {
					maxCount = counts[node.Name]
				}
			}
		}
	}

	result := make(schedulerapi.HostPriorityList, 0, len(nodes.Items))
	for i := range nodes.Items {
		node := &nodes.Items[i]
		if maxCount > 0 {
			fScore := 10 * (counts[node.Name] / maxCount)
			result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: int(fScore)})
			if glog.V(10) {
				// We explicitly don't do glog.V(10).Infof() to avoid computing all the parameters if this is
				// not logged. There is visible performance gain from it.
				glog.Infof("%v -> %v: NodeAffinityPriority, Score: (%d)", pod.Name, node.Name, int(fScore))
			}
		} else {
			result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: 0})
		}
	}
	return result, nil
}

// CalculateNodeAffinityPriority prioritizes nodes according to node affinity scheduling preferences
// indicated in PreferredDuringSchedulingIgnoredDuringExecution. Each time a node match a preferredSchedulingTerm,
// it will a get an add of preferredSchedulingTerm.Weight. Thus, the more preferredSchedulingTerms
// the node satisfies and the more the preferredSchedulingTerm that is satisfied weights, the higher
// score the node gets.
func (s *NodeAffinity) CalculateNodeAffinityPriority(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodeLister algorithm.NodeLister) (schedulerapi.HostPriorityList, error) {

	var maxCount int
	counts := map[string]int{}

	nodes, err := nodeLister.List()
	if err != nil {
		return nil, err
	}

	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return nil, err
	}

	// A nil element of PreferredDuringSchedulingIgnoredDuringExecution matches no objects.
	// An element of PreferredDuringSchedulingIgnoredDuringExecution that refers to an
	// empty PreferredSchedulingTerm matches all objects.
	if affinity.NodeAffinity != nil && affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution != nil {
		// Match PreferredDuringSchedulingIgnoredDuringExecution term by term.
		for _, preferredSchedulingTerm := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
			if preferredSchedulingTerm.Weight == 0 {
				continue
			}

			nodeSelector, err := api.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
			if err != nil {
				return nil, err
			}

			for _, node := range nodes.Items {
				if nodeSelector.Matches(labels.Set(node.Labels)) {
					counts[node.Name] += preferredSchedulingTerm.Weight
				}

				if counts[node.Name] > maxCount {
					maxCount = counts[node.Name]
				}
			}
		}
	}

	result := []schedulerapi.HostPriority{}
	for _, node := range nodes.Items {
		fScore := float64(0)
		if maxCount > 0 {
			fScore = 10 * (float64(counts[node.Name]) / float64(maxCount))
		}
		result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: int(fScore)})
		glog.V(10).Infof("%v -> %v: NodeAffinityPriority, Score: (%d)", pod.Name, node.Name, int(fScore))
	}
	return result, nil
}

// The pod can only schedule onto nodes that satisfy requirements in both NodeAffinity and nodeSelector.
func podMatchesNodeLabels(pod *api.Pod, node *api.Node) bool {
	// Check if node.Labels match pod.Spec.NodeSelector.
	if len(pod.Spec.NodeSelector) > 0 {
		selector := labels.SelectorFromSet(pod.Spec.NodeSelector)
		if !selector.Matches(labels.Set(node.Labels)) {
			return false
		}
	}

	// Parse required node affinity scheduling requirements
	// and check if the current node match the requirements.
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		glog.V(10).Infof("Failed to get Affinity from Pod %+v, err: %+v", podName(pod), err)
		return false
	}

	// 1. nil NodeSelector matches all nodes (i.e. does not filter out any nodes)
	// 2. nil []NodeSelectorTerm (equivalent to non-nil empty NodeSelector) matches no nodes
	// 3. zero-length non-nil []NodeSelectorTerm matches no nodes also, just for simplicity
	// 4. nil []NodeSelectorRequirement (equivalent to non-nil empty NodeSelectorTerm) matches no nodes
	// 5. zero-length non-nil []NodeSelectorRequirement matches no nodes also, just for simplicity
	// 6. non-nil empty NodeSelectorRequirement is not allowed
	nodeAffinityMatches := true
	if affinity.NodeAffinity != nil {
		nodeAffinity := affinity.NodeAffinity
		// if no required NodeAffinity requirements, will do no-op, means select all nodes.
		// TODO: Replace next line with subsequent commented-out line when implement RequiredDuringSchedulingRequiredDuringExecution.
		if nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution == nil {
			// if nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution == nil && nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution == nil {
			return true
		}

		// Match node selector for requiredDuringSchedulingRequiredDuringExecution.
		// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
		// if nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution != nil {
		// 	nodeSelectorTerms := nodeAffinity.RequiredDuringSchedulingRequiredDuringExecution.NodeSelectorTerms
		// 	glog.V(10).Infof("Match for RequiredDuringSchedulingRequiredDuringExecution node selector terms %+v", nodeSelectorTerms)
		// 	nodeAffinityMatches = nodeMatchesNodeSelectorTerms(node, nodeSelectorTerms)
		// }

		// Match node selector for requiredDuringSchedulingIgnoredDuringExecution.
		if nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution != nil {
			nodeSelectorTerms := nodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms
			glog.V(10).Infof("Match for RequiredDuringSchedulingIgnoredDuringExecution node selector terms %+v", nodeSelectorTerms)
			nodeAffinityMatches = nodeAffinityMatches && nodeMatchesNodeSelectorTerms(node, nodeSelectorTerms)
		}

	}
	return nodeAffinityMatches
}

// Checks whether the given node has pods which satisfy all the
// required pod anti-affinity scheduling rules.
// Also checks whether putting the pod onto the node would break
// any anti-affinity scheduling rules indicated by existing pods.
// If node has pods which satisfy all the required pod anti-affinity
// scheduling rules and scheduling the pod onto the node won't
// break any existing pods' anti-affinity rules, then return true.
func (checker *PodAffinityChecker) NodeMatchesHardPodAntiAffinity(pod *api.Pod, allPods []*api.Pod, node *api.Node, podAntiAffinity *api.PodAntiAffinity) bool {
	// foreach element podAntiAffinityTerm of podAntiAffinityTerms
	// if the pod matches the term (breaks the anti-affinity),
	// don't schedule the pod onto this node.
	for _, podAntiAffinityTerm := range getPodAntiAffinityTerms(podAntiAffinity) {
		podAntiAffinityTermMatches, _, err := checker.AnyPodMatchesPodAffinityTerm(pod, allPods, node, podAntiAffinityTerm)
		if err != nil || podAntiAffinityTermMatches {
			glog.V(10).Infof("Cannot schedule pod %+v onto node %v, because not all the existing pods on this node satisfy the PodAntiAffinityTerm %v, err: %v",
				podName(pod), node.Name, podAntiAffinityTerm, err)
			return false
		}
	}

	// Check if scheduling the pod onto this node would break
	// any anti-affinity rules indicated by the existing pods on the node.
	// If it would break, system should not schedule pod onto this node.
	for _, ep := range allPods {
		epAffinity, err := api.GetAffinityFromPodAnnotations(ep.Annotations)
		if err != nil {
			glog.V(10).Infof("Failed to get Affinity from Pod %+v, err: %+v", podName(pod), err)
			return false
		}
		if epAffinity == nil {
			continue
		}
		epNode, err := checker.info.GetNodeInfo(ep.Spec.NodeName)
		if err != nil {
			glog.V(10).Infof("Failed to get node from Pod %+v, err: %+v", podName(ep), err)
			return false
		}
		for _, epAntiAffinityTerm := range getPodAntiAffinityTerms(epAffinity.PodAntiAffinity) {
			match, err := priorityutil.PodMatchesTermsNamespaceAndSelector(pod, ep, &epAntiAffinityTerm)
			if err != nil {
				glog.V(10).Infof("Failed to get label selector from anti-affinityterm %+v of existing pod %+v, err: %+v", epAntiAffinityTerm, podName(pod), err)
				return false
			}
			if match && checker.failureDomains.NodesHaveSameTopologyKey(node, epNode, epAntiAffinityTerm.TopologyKey) {
				glog.V(10).Infof("Cannot schedule Pod %+v, onto node %v because the pod would break the PodAntiAffinityTerm %+v, of existing pod %+v, err: %v",
					podName(pod), node.Name, epAntiAffinityTerm, podName(ep), err)
				return false
			}
		}
	}
	// all the required pod anti-affinity scheduling rules are satisfied
	glog.V(10).Infof("Can schedule Pod %+v, on node %v because all the required pod anti-affinity scheduling rules are satisfied", podName(pod), node.Name)
	return true
}

// CalculateNodeAffinityPriority prioritizes nodes according to node affinity scheduling preferences
// indicated in PreferredDuringSchedulingIgnoredDuringExecution. Each time a node match a preferredSchedulingTerm,
// it will a get an add of preferredSchedulingTerm.Weight. Thus, the more preferredSchedulingTerms
// the node satisfies and the more the preferredSchedulingTerm that is satisfied weights, the higher
// score the node gets.
func CalculateNodeAffinityPriorityMap(pod *api.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error) {
	node := nodeInfo.Node()
	if node == nil {
		return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
	}

	var affinity *api.Affinity
	if priorityMeta, ok := meta.(*priorityMetadata); ok {
		affinity = priorityMeta.affinity
	} else {
		// We couldn't parse metadata - fallback to computing it.
		var err error
		affinity, err = api.GetAffinityFromPodAnnotations(pod.Annotations)
		if err != nil {
			return schedulerapi.HostPriority{}, err
		}
	}

	var count int32
	// A nil element of PreferredDuringSchedulingIgnoredDuringExecution matches no objects.
	// An element of PreferredDuringSchedulingIgnoredDuringExecution that refers to an
	// empty PreferredSchedulingTerm matches all objects.
	if affinity != nil && affinity.NodeAffinity != nil && affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution != nil {
		// Match PreferredDuringSchedulingIgnoredDuringExecution term by term.
		for i := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
			preferredSchedulingTerm := &affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution[i]
			if preferredSchedulingTerm.Weight == 0 {
				continue
			}

			// TODO: Avoid computing it for all nodes if this becomes a performance problem.
			nodeSelector, err := api.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
			if err != nil {
				return schedulerapi.HostPriority{}, err
			}
			if nodeSelector.Matches(labels.Set(node.Labels)) {
				count += preferredSchedulingTerm.Weight
			}
		}
	}

	return schedulerapi.HostPriority{
		Host:  node.Name,
		Score: int(count),
	}, nil
}

// NodeMatchPodAffinityAntiAffinity checks if the node matches
// the requiredDuringScheduling affinity/anti-affinity rules indicated by the pod.
func (checker *PodAffinityChecker) NodeMatchPodAffinityAntiAffinity(pod *api.Pod, allPods []*api.Pod, node *api.Node) bool {
	// Parse required affinity scheduling rules.
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		glog.V(10).Infof("Failed to get Affinity from Pod %+v, err: %+v", podName(pod), err)
		return false
	}

	// check if the current node match the inter-pod affinity scheduling rules.
	// hard inter-pod affinity is not symmetric, check only when affinity.PodAffinity is not nil.
	if affinity.PodAffinity != nil {
		if !checker.NodeMatchesHardPodAffinity(pod, allPods, node, affinity.PodAffinity) {
			return false
		}
	}

	// hard inter-pod anti-affinity is symmetric, check both when affinity.PodAntiAffinity is nil and not nil.
	return checker.NodeMatchesHardPodAntiAffinity(pod, allPods, node, affinity.PodAntiAffinity)
}

func PriorityMetadata(pod *api.Pod) interface{} {
	// If we cannot compute metadata, just return nil
	if pod == nil {
		return nil
	}
	tolerations, err := getTolerationListFromPod(pod)
	if err != nil {
		return nil
	}
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return nil
	}
	return &priorityMetadata{
		nonZeroRequest: getNonZeroRequests(pod),
		podTolerations: tolerations,
		affinity:       affinity,
	}
}

// Checks whether the given node has pods which satisfy all the
// required pod anti-affinity scheduling rules.
// Also checks whether putting the pod onto the node would break
// any anti-affinity scheduling rules indicated by existing pods.
// If node has pods which satisfy all the required pod anti-affinity
// scheduling rules and scheduling the pod onto the node won't
// break any existing pods' anti-affinity rules, then return true.
func (checker *PodAffinityChecker) NodeMatchesHardPodAntiAffinity(pod *api.Pod, allPods []*api.Pod, node *api.Node, podAntiAffinity *api.PodAntiAffinity) bool {
	var podAntiAffinityTerms []api.PodAffinityTerm
	if len(podAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
		podAntiAffinityTerms = podAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution
	}
	// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
	//if len(podAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
	//	podAntiAffinityTerms = append(podAntiAffinityTerms, podAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
	//}

	// foreach element podAntiAffinityTerm of podAntiAffinityTerms
	// if the pod matches the term (breaks the anti-affinity),
	// don't schedule the pod onto this node.
	for _, podAntiAffinityTerm := range podAntiAffinityTerms {
		podAntiAffinityTermMatches, err := checker.AnyPodMatchesPodAffinityTerm(pod, allPods, node, podAntiAffinityTerm)
		if err != nil || podAntiAffinityTermMatches == true {
			glog.V(10).Infof("Cannot schedule pod %+v onto node %v, because not all the existing pods on this node satisfy the PodAntiAffinityTerm %v, err: %v",
				podName(pod), node.Name, podAntiAffinityTerm, err)
			return false
		}
	}

	// Check if scheduling the pod onto this node would break
	// any anti-affinity rules indicated by the existing pods on the node.
	// If it would break, system should not schedule pod onto this node.
	for _, ep := range allPods {
		epAffinity, err := api.GetAffinityFromPodAnnotations(ep.Annotations)
		if err != nil {
			glog.V(10).Infof("Failed to get Affinity from Pod %+v, err: %+v", podName(pod), err)
			return false
		}
		if epAffinity.PodAntiAffinity != nil {
			var epAntiAffinityTerms []api.PodAffinityTerm
			if len(epAffinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
				epAntiAffinityTerms = epAffinity.PodAntiAffinity.RequiredDuringSchedulingIgnoredDuringExecution
			}
			// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
			//if len(epAffinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
			//	epAntiAffinityTerms = append(epAntiAffinityTerms, epAffinity.PodAntiAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
			//}

			for _, epAntiAffinityTerm := range epAntiAffinityTerms {
				labelSelector, err := unversioned.LabelSelectorAsSelector(epAntiAffinityTerm.LabelSelector)
				if err != nil {
					glog.V(10).Infof("Failed to get label selector from anti-affinityterm %+v of existing pod %+v, err: %+v", epAntiAffinityTerm, podName(pod), err)
					return false
				}

				names := priorityutil.GetNamespacesFromPodAffinityTerm(ep, epAntiAffinityTerm)
				if (len(names) == 0 || names.Has(pod.Namespace)) && labelSelector.Matches(labels.Set(pod.Labels)) {
					epNode, err := checker.info.GetNodeInfo(ep.Spec.NodeName)
					if err != nil || checker.failureDomains.NodesHaveSameTopologyKey(node, epNode, epAntiAffinityTerm.TopologyKey) {
						glog.V(10).Infof("Cannot schedule Pod %+v, onto node %v because the pod would break the PodAntiAffinityTerm %+v, of existing pod %+v, err: %v",
							podName(pod), node.Name, epAntiAffinityTerm, podName(ep), err)
						return false
					}
				}
			}
		}
	}
	// all the required pod anti-affinity scheduling rules are satisfied
	glog.V(10).Infof("Can schedule Pod %+v, on node %v because all the required pod anti-affinity scheduling rules are satisfied", podName(pod), node.Name)
	return true
}

// compute a sum by iterating through the elements of weightedPodAffinityTerm and adding
// "weight" to the sum if the corresponding PodAffinityTerm is satisfied for
// that node; the node(s) with the highest sum are the most preferred.
// Symmetry need to be considered for preferredDuringSchedulingIgnoredDuringExecution from podAffinity & podAntiAffinity,
// symmetry need to be considered for hard requirements from podAffinity
func (ipa *InterPodAffinity) CalculateInterPodAffinityPriority(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodeLister algorithm.NodeLister) (schedulerapi.HostPriorityList, error) {
	nodes, err := nodeLister.List()
	if err != nil {
		return nil, err
	}
	allPods, err := ipa.podLister.List(labels.Everything())
	if err != nil {
		return nil, err
	}
	affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
	if err != nil {
		return nil, err
	}

	// convert the topology key based weights to the node name based weights
	var maxCount int
	var minCount int
	counts := map[string]int{}
	for _, node := range nodes.Items {
		totalCount := 0
		// count weights for the weighted pod affinity
		if affinity.PodAffinity != nil {
			for _, weightedTerm := range affinity.PodAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
				weightedCount, err := ipa.CountWeightByPodMatchAffinityTerm(pod, allPods, weightedTerm.Weight, weightedTerm.PodAffinityTerm, &node)
				if err != nil {
					return nil, err
				}
				totalCount += weightedCount
			}
		}

		// count weights for the weighted pod anti-affinity
		if affinity.PodAntiAffinity != nil {
			for _, weightedTerm := range affinity.PodAntiAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
				weightedCount, err := ipa.CountWeightByPodMatchAffinityTerm(pod, allPods, (0 - weightedTerm.Weight), weightedTerm.PodAffinityTerm, &node)
				if err != nil {
					return nil, err
				}
				totalCount += weightedCount
			}
		}

		// reverse direction checking: count weights for the inter-pod affinity/anti-affinity rules
		// that are indicated by existing pods on the node.
		for _, ep := range allPods {
			epAffinity, err := api.GetAffinityFromPodAnnotations(ep.Annotations)
			if err != nil {
				return nil, err
			}

			if epAffinity.PodAffinity != nil {
				// count the implicit weight for the hard pod affinity indicated by the existing pod.
				if ipa.hardPodAffinityWeight > 0 {
					var podAffinityTerms []api.PodAffinityTerm
					if len(epAffinity.PodAffinity.RequiredDuringSchedulingIgnoredDuringExecution) != 0 {
						podAffinityTerms = epAffinity.PodAffinity.RequiredDuringSchedulingIgnoredDuringExecution
					}
					// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
					//if len(affinity.PodAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
					//	podAffinityTerms = append(podAffinityTerms, affinity.PodAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
					//}
					for _, epAffinityTerm := range podAffinityTerms {
						match, err := ipa.failureDomains.CheckIfPodMatchPodAffinityTerm(pod, ep, epAffinityTerm,
							func(pod *api.Pod) (*api.Node, error) { return &node, nil },
							func(ep *api.Pod) (*api.Node, error) { return ipa.info.GetNodeInfo(ep.Spec.NodeName) },
						)
						if err != nil {
							return nil, err
						}
						if match {
							totalCount += ipa.hardPodAffinityWeight
						}
					}
				}

				// count weight for the weighted pod affinity indicated by the existing pod.
				for _, epWeightedTerm := range epAffinity.PodAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
					match, err := ipa.failureDomains.CheckIfPodMatchPodAffinityTerm(pod, ep, epWeightedTerm.PodAffinityTerm,
						func(pod *api.Pod) (*api.Node, error) { return &node, nil },
						func(ep *api.Pod) (*api.Node, error) { return ipa.info.GetNodeInfo(ep.Spec.NodeName) },
					)
					if err != nil {
						return nil, err
					}
					if match {
						totalCount += epWeightedTerm.Weight
					}
				}
			}

			// count weight for the weighted pod anti-affinity indicated by the existing pod.
			if epAffinity.PodAntiAffinity != nil {
				for _, epWeightedTerm := range epAffinity.PodAntiAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
					match, err := ipa.failureDomains.CheckIfPodMatchPodAffinityTerm(pod, ep, epWeightedTerm.PodAffinityTerm,
						func(pod *api.Pod) (*api.Node, error) { return &node, nil },
//.........這裏部分代碼省略.........