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104 lines
3.7 KiB
Go
104 lines
3.7 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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"fmt"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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v1helper "k8s.io/kubernetes/pkg/api/v1/helper"
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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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"github.com/golang/glog"
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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 CalculateNodeAffinityPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error) {
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node := nodeInfo.Node()
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if node == nil {
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return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
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}
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var affinity *v1.Affinity
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if priorityMeta, ok := meta.(*priorityMetadata); ok {
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affinity = priorityMeta.affinity
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} else {
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// We couldn't parse metadata - fallback to the podspec.
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affinity = pod.Spec.Affinity
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}
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var count int32
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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 i := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
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preferredSchedulingTerm := &affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution[i]
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if preferredSchedulingTerm.Weight == 0 {
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continue
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}
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// TODO: Avoid computing it for all nodes if this becomes a performance problem.
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nodeSelector, err := v1helper.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
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if err != nil {
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return schedulerapi.HostPriority{}, err
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}
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if nodeSelector.Matches(labels.Set(node.Labels)) {
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count += preferredSchedulingTerm.Weight
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}
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}
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}
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return schedulerapi.HostPriority{
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Host: node.Name,
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Score: int(count),
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}, nil
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}
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func CalculateNodeAffinityPriorityReduce(pod *v1.Pod, meta interface{}, nodeNameToInfo map[string]*schedulercache.NodeInfo, result schedulerapi.HostPriorityList) error {
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var maxCount int
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for i := range result {
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if result[i].Score > maxCount {
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maxCount = result[i].Score
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}
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}
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maxCountFloat := float64(maxCount)
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var fScore float64
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for i := range result {
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if maxCount > 0 {
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fScore = float64(schedulerapi.MaxPriority) * (float64(result[i].Score) / maxCountFloat)
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} else {
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fScore = 0
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}
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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, result[i].Host, int(fScore))
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}
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result[i].Score = int(fScore)
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}
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return nil
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}
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