mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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84 lines
3.2 KiB
Go
84 lines
3.2 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package priorities
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import (
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/labels"
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schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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)
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// CalculateNodeAffinityPriority prioritizes nodes according to node affinity scheduling preferences
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// indicated in PreferredDuringSchedulingIgnoredDuringExecution. Each time a node match a preferredSchedulingTerm,
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// it will a get an add of preferredSchedulingTerm.Weight. Thus, the more preferredSchedulingTerms
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// the node satisfies and the more the preferredSchedulingTerm that is satisfied weights, the higher
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// score the node gets.
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func CalculateNodeAffinityPriority(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*api.Node) (schedulerapi.HostPriorityList, error) {
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var maxCount float64
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counts := make(map[string]float64, len(nodes))
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affinity, err := api.GetAffinityFromPodAnnotations(pod.Annotations)
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if err != nil {
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return nil, err
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}
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// A nil element of PreferredDuringSchedulingIgnoredDuringExecution matches no objects.
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// An element of PreferredDuringSchedulingIgnoredDuringExecution that refers to an
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// empty PreferredSchedulingTerm matches all objects.
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if affinity != nil && affinity.NodeAffinity != nil && affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution != nil {
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// Match PreferredDuringSchedulingIgnoredDuringExecution term by term.
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for _, preferredSchedulingTerm := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
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if preferredSchedulingTerm.Weight == 0 {
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continue
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}
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nodeSelector, err := api.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
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if err != nil {
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return nil, err
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}
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for _, node := range nodes {
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if nodeSelector.Matches(labels.Set(node.Labels)) {
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counts[node.Name] += float64(preferredSchedulingTerm.Weight)
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}
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if counts[node.Name] > maxCount {
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maxCount = counts[node.Name]
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}
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}
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}
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}
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result := make(schedulerapi.HostPriorityList, 0, len(nodes))
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for _, node := range nodes {
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if maxCount > 0 {
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fScore := 10 * (counts[node.Name] / maxCount)
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result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: int(fScore)})
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if glog.V(10) {
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// We explicitly don't do glog.V(10).Infof() to avoid computing all the parameters if this is
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// not logged. There is visible performance gain from it.
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glog.Infof("%v -> %v: NodeAffinityPriority, Score: (%d)", pod.Name, node.Name, int(fScore))
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}
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} else {
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result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: 0})
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}
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}
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return result, nil
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}
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