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https://github.com/optim-enterprises-bv/kubernetes.git
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103 lines
3.5 KiB
Go
103 lines
3.5 KiB
Go
/*
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Copyright 2016 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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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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// CountIntolerableTaintsPreferNoSchedule gives the count of intolerable taints of a pod with effect PreferNoSchedule
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func countIntolerableTaintsPreferNoSchedule(taints []api.Taint, tolerations []api.Toleration) (intolerableTaints float64) {
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for i := range taints {
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taint := &taints[i]
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// check only on taints that have effect PreferNoSchedule
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if taint.Effect != api.TaintEffectPreferNoSchedule {
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continue
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}
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if !api.TaintToleratedByTolerations(taint, tolerations) {
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intolerableTaints++
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}
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}
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return
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}
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// getAllTolerationEffectPreferNoSchedule gets the list of all Toleration with Effect PreferNoSchedule
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func getAllTolerationPreferNoSchedule(tolerations []api.Toleration) (tolerationList []api.Toleration) {
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for i := range tolerations {
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toleration := &tolerations[i]
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if len(toleration.Effect) == 0 || toleration.Effect == api.TaintEffectPreferNoSchedule {
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tolerationList = append(tolerationList, *toleration)
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}
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}
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return
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}
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// ComputeTaintTolerationPriority prepares the priority list for all the nodes based on the number of intolerable taints on the node
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func ComputeTaintTolerationPriority(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*api.Node) (schedulerapi.HostPriorityList, error) {
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// the max value of counts
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var maxCount float64
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// counts hold the count of intolerable taints of a pod for a given node
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counts := make(map[string]float64, len(nodes))
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tolerations, err := api.GetTolerationsFromPodAnnotations(pod.Annotations)
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if err != nil {
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return nil, err
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}
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// Fetch a list of all toleration with effect PreferNoSchedule
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tolerationList := getAllTolerationPreferNoSchedule(tolerations)
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// calculate the intolerable taints for all the nodes
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for _, node := range nodes {
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taints, err := api.GetTaintsFromNodeAnnotations(node.Annotations)
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if err != nil {
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return nil, err
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}
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count := countIntolerableTaintsPreferNoSchedule(taints, tolerationList)
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if count > 0 {
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// 0 is default value, so avoid unnecessary map operations.
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counts[node.Name] = count
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if count > maxCount {
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maxCount = count
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}
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}
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}
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// The maximum priority value to give to a node
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// Priority values range from 0 - maxPriority
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const maxPriority = float64(10)
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result := make(schedulerapi.HostPriorityList, 0, len(nodes))
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for _, node := range nodes {
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fScore := maxPriority
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if maxCount > 0 {
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fScore = (1.0 - counts[node.Name]/maxCount) * 10
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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: Taint Toleration Priority, Score: (%d)", pod.Name, node.Name, int(fScore))
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}
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result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: int(fScore)})
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}
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return result, nil
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}
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