67 lines
2.4 KiB
Go
67 lines
2.4 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/algorithm/priorities"
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"k8s.io/kubernetes/pkg/scheduler/framework/plugins/migration"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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// BalancedAllocation is a score plugin that calculates the difference between the cpu and memory fraction
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// of capacity, and prioritizes the host based on how close the two metrics are to each other.
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type BalancedAllocation struct {
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handle framework.FrameworkHandle
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}
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var _ = framework.ScorePlugin(&BalancedAllocation{})
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// BalancedAllocationName is the name of the plugin used in the plugin registry and configurations.
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const BalancedAllocationName = "NodeResourcesBalancedAllocation"
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// Name returns name of the plugin. It is used in logs, etc.
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func (ba *BalancedAllocation) Name() string {
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return BalancedAllocationName
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}
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// Score invoked at the score extension point.
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func (ba *BalancedAllocation) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
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nodeInfo, err := ba.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
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if err != nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v", nodeName, err))
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}
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// BalancedResourceAllocationMap does not use priority metadata, hence we pass nil here
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s, err := priorities.BalancedResourceAllocationMap(pod, nil, nodeInfo)
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return s.Score, migration.ErrorToFrameworkStatus(err)
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}
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// ScoreExtensions of the Score plugin.
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func (ba *BalancedAllocation) ScoreExtensions() framework.ScoreExtensions {
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return nil
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}
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// NewBalancedAllocation initializes a new plugin and returns it.
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func NewBalancedAllocation(_ *runtime.Unknown, h framework.FrameworkHandle) (framework.Plugin, error) {
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return &BalancedAllocation{handle: h}, nil
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}
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