118 lines
4.2 KiB
Go
118 lines
4.2 KiB
Go
/*
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Copyright 2019 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 noderesources
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/scheduler/apis/config"
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"k8s.io/kubernetes/pkg/scheduler/apis/config/validation"
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"k8s.io/kubernetes/pkg/scheduler/framework"
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)
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// MostAllocated is a score plugin that favors nodes with high allocation based on requested resources.
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type MostAllocated struct {
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handle framework.Handle
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resourceAllocationScorer
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}
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var _ = framework.ScorePlugin(&MostAllocated{})
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// MostAllocatedName is the name of the plugin used in the plugin registry and configurations.
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const MostAllocatedName = "NodeResourcesMostAllocated"
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// Name returns name of the plugin. It is used in logs, etc.
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func (ma *MostAllocated) Name() string {
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return MostAllocatedName
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}
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// Score invoked at the Score extension point.
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func (ma *MostAllocated) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
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nodeInfo, err := ma.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
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if err != nil || nodeInfo.Node() == nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v, node is nil: %v", nodeName, err, nodeInfo.Node() == nil))
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}
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// ma.score favors nodes with most requested resources.
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// It calculates the percentage of memory and CPU requested by pods scheduled on the node, and prioritizes
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// based on the maximum of the average of the fraction of requested to capacity.
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// Details: (cpu(MaxNodeScore * sum(requested) / capacity) + memory(MaxNodeScore * sum(requested) / capacity)) / weightSum
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return ma.score(pod, nodeInfo)
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}
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// ScoreExtensions of the Score plugin.
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func (ma *MostAllocated) ScoreExtensions() framework.ScoreExtensions {
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return nil
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}
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// NewMostAllocated initializes a new plugin and returns it.
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func NewMostAllocated(maArgs runtime.Object, h framework.Handle) (framework.Plugin, error) {
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args, ok := maArgs.(*config.NodeResourcesMostAllocatedArgs)
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if !ok {
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return nil, fmt.Errorf("want args to be of type NodeResourcesMostAllocatedArgs, got %T", args)
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}
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if err := validation.ValidateNodeResourcesMostAllocatedArgs(args); err != nil {
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return nil, err
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}
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resToWeightMap := make(resourceToWeightMap)
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for _, resource := range (*args).Resources {
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resToWeightMap[v1.ResourceName(resource.Name)] = resource.Weight
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}
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return &MostAllocated{
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handle: h,
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resourceAllocationScorer: resourceAllocationScorer{
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Name: MostAllocatedName,
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scorer: mostResourceScorer(resToWeightMap),
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resourceToWeightMap: resToWeightMap,
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},
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}, nil
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}
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func mostResourceScorer(resToWeightMap resourceToWeightMap) func(requested, allocable resourceToValueMap, includeVolumes bool, requestedVolumes int, allocatableVolumes int) int64 {
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return func(requested, allocable resourceToValueMap, includeVolumes bool, requestedVolumes int, allocatableVolumes int) int64 {
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var nodeScore, weightSum int64
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for resource, weight := range resToWeightMap {
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resourceScore := mostRequestedScore(requested[resource], allocable[resource])
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nodeScore += resourceScore * weight
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weightSum += weight
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}
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return (nodeScore / weightSum)
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}
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}
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// The used capacity is calculated on a scale of 0-MaxNodeScore (MaxNodeScore is
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// constant with value set to 100).
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// 0 being the lowest priority and 100 being the highest.
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// The more resources are used the higher the score is. This function
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// is almost a reversed version of noderesources.leastRequestedScore.
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func mostRequestedScore(requested, capacity int64) int64 {
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if capacity == 0 {
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return 0
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}
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if requested > capacity {
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return 0
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}
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return (requested * framework.MaxNodeScore) / capacity
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}
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