func hasPodAffinityConstraints(pod *v1.Pod) bool {
affinity, err := v1.GetAffinityFromPodAnnotations(pod.Annotations)
if err != nil || affinity == nil {
return false
}
return affinity.PodAffinity != nil || affinity.PodAntiAffinity != nil
}
func (c *PodAffinityChecker) getMatchingAntiAffinityTerms(pod *v1.Pod, allPods []*v1.Pod) ([]matchingPodAntiAffinityTerm, error) {
var result []matchingPodAntiAffinityTerm
for _, existingPod := range allPods {
affinity, err := v1.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
}
func (c *PodAffinityChecker) InterPodAffinityMatches(pod *v1.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 := v1.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
}
func getMatchingAntiAffinityTerms(pod *v1.Pod, nodeInfoMap map[string]*schedulercache.NodeInfo) ([]matchingPodAntiAffinityTerm, error) {
allNodeNames := make([]string, 0, len(nodeInfoMap))
for name := range nodeInfoMap {
allNodeNames = append(allNodeNames, name)
}
var lock sync.Mutex
var result []matchingPodAntiAffinityTerm
var firstError error
appendResult := func(toAppend []matchingPodAntiAffinityTerm) {
lock.Lock()
defer lock.Unlock()
result = append(result, toAppend...)
}
catchError := func(err error) {
lock.Lock()
defer lock.Unlock()
if firstError == nil {
firstError = err
}
}
processNode := func(i int) {
nodeInfo := nodeInfoMap[allNodeNames[i]]
node := nodeInfo.Node()
if node == nil {
catchError(fmt.Errorf("node not found"))
return
}
var nodeResult []matchingPodAntiAffinityTerm
for _, existingPod := range nodeInfo.PodsWithAffinity() {
affinity, err := v1.GetAffinityFromPodAnnotations(existingPod.Annotations)
if err != nil {
catchError(err)
return
}
if affinity == nil {
continue
}
for _, term := range getPodAntiAffinityTerms(affinity.PodAntiAffinity) {
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})
}
}
}
if len(nodeResult) > 0 {
appendResult(nodeResult)
}
}
workqueue.Parallelize(16, len(allNodeNames), processNode)
return result, firstError
}
// The pod can only schedule onto nodes that satisfy requirements in both NodeAffinity and nodeSelector.
func podMatchesNodeLabels(pod *v1.Pod, node *v1.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 := v1.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 != nil && 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
}
// 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 *v1.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 *v1.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 = v1.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 := v1.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
}
// PriorityMetadata is a MetadataProducer. Node info can be nil.
func PriorityMetadata(pod *v1.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo) 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 := v1.GetAffinityFromPodAnnotations(pod.Annotations)
if err != nil {
return nil
}
return &priorityMetadata{
nonZeroRequest: getNonZeroRequests(pod),
podTolerations: tolerations,
affinity: affinity,
}
}
// 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 *v1.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*v1.Node) (schedulerapi.HostPriorityList, error) {
affinity, err := v1.GetAffinityFromPodAnnotations(pod.Annotations)
if err != nil {
return nil, err
}
hasAffinityConstraints := affinity != nil && affinity.PodAffinity != nil
hasAntiAffinityConstraints := affinity != nil && affinity.PodAntiAffinity != nil
allNodeNames := make([]string, 0, len(nodeNameToInfo))
for name := range nodeNameToInfo {
allNodeNames = append(allNodeNames, name)
}
// convert the topology key based weights to the node name based weights
var maxCount float64
var minCount float64
// priorityMap stores the mapping from node name to so-far computed score of
// the node.
pm := newPodAffinityPriorityMap(nodes, ipa.failureDomains)
processPod := func(existingPod *v1.Pod) error {
existingPodNode, err := ipa.info.GetNodeInfo(existingPod.Spec.NodeName)
if err != nil {
return err
}
existingPodAffinity, err := v1.GetAffinityFromPodAnnotations(existingPod.Annotations)
if err != nil {
return err
}
existingHasAffinityConstraints := existingPodAffinity != nil && existingPodAffinity.PodAffinity != nil
existingHasAntiAffinityConstraints := existingPodAffinity != nil && existingPodAffinity.PodAntiAffinity != nil
if hasAffinityConstraints {
// For every soft pod affinity term of <pod>, if <existingPod> matches the term,
// increment <pm.counts> for every node in the cluster with the same <term.TopologyKey>
// value as that of <existingPods>`s node by the term`s weight.
terms := affinity.PodAffinity.PreferredDuringSchedulingIgnoredDuringExecution
pm.processTerms(terms, pod, existingPod, existingPodNode, 1)
}
if hasAntiAffinityConstraints {
// For every soft pod anti-affinity term of <pod>, if <existingPod> matches the term,
// decrement <pm.counts> for every node in the cluster with the same <term.TopologyKey>
// value as that of <existingPod>`s node by the term`s weight.
terms := affinity.PodAntiAffinity.PreferredDuringSchedulingIgnoredDuringExecution
pm.processTerms(terms, pod, existingPod, existingPodNode, -1)
}
if existingHasAffinityConstraints {
// For every hard pod affinity term of <existingPod>, if <pod> matches the term,
// increment <pm.counts> for every node in the cluster with the same <term.TopologyKey>
// value as that of <existingPod>'s node by the constant <ipa.hardPodAffinityWeight>
if ipa.hardPodAffinityWeight > 0 {
terms := existingPodAffinity.PodAffinity.RequiredDuringSchedulingIgnoredDuringExecution
// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
//if len(existingPodAffinity.PodAffinity.RequiredDuringSchedulingRequiredDuringExecution) != 0 {
// terms = append(terms, existingPodAffinity.PodAffinity.RequiredDuringSchedulingRequiredDuringExecution...)
//}
for _, term := range terms {
pm.processTerm(&term, existingPod, pod, existingPodNode, float64(ipa.hardPodAffinityWeight))
}
}
// For every soft pod affinity term of <existingPod>, if <pod> matches the term,
// increment <pm.counts> for every node in the cluster with the same <term.TopologyKey>
// value as that of <existingPod>'s node by the term's weight.
terms := existingPodAffinity.PodAffinity.PreferredDuringSchedulingIgnoredDuringExecution
pm.processTerms(terms, existingPod, pod, existingPodNode, 1)
}
if existingHasAntiAffinityConstraints {
// For every soft pod anti-affinity term of <existingPod>, if <pod> matches the term,
// decrement <pm.counts> for every node in the cluster with the same <term.TopologyKey>
// value as that of <existingPod>'s node by the term's weight.
terms := existingPodAffinity.PodAntiAffinity.PreferredDuringSchedulingIgnoredDuringExecution
pm.processTerms(terms, existingPod, pod, existingPodNode, -1)
}
return nil
}
processNode := func(i int) {
nodeInfo := nodeNameToInfo[allNodeNames[i]]
if hasAffinityConstraints || hasAntiAffinityConstraints {
// We need to process all the nodes.
for _, existingPod := range nodeInfo.Pods() {
if err := processPod(existingPod); err != nil {
pm.setError(err)
}
}
} else {
// The pod doesn't have any constraints - we need to check only existing
// ones that have some.
for _, existingPod := range nodeInfo.PodsWithAffinity() {
if err := processPod(existingPod); err != nil {
pm.setError(err)
}
}
}
}
workqueue.Parallelize(16, len(allNodeNames), processNode)
if pm.firstError != nil {
return nil, pm.firstError
}
for _, node := range nodes {
if pm.counts[node.Name] > maxCount {
maxCount = pm.counts[node.Name]
}
if pm.counts[node.Name] < minCount {
minCount = pm.counts[node.Name]
}
}
// calculate final priority score for each node
result := make(schedulerapi.HostPriorityList, 0, len(nodes))
for _, node := range nodes {
fScore := float64(0)
if (maxCount - minCount) > 0 {
fScore = 10 * ((pm.counts[node.Name] - minCount) / (maxCount - minCount))
}
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.V(10).Infof("%v -> %v: InterPodAffinityPriority, Score: (%d)", pod.Name, node.Name, int(fScore))
}
}
return result, nil
}
