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d99cc01646
- Enable defaultpreemption as a PostFilter plugin - Remote legacy hard-coded preemption logic
77 lines
2.6 KiB
Go
77 lines
2.6 KiB
Go
/*
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Copyright 2020 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 defaultpreemption
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import (
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"context"
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"time"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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kubefeatures "k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/scheduler/core"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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"k8s.io/kubernetes/pkg/scheduler/metrics"
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)
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const (
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// Name of the plugin used in the plugin registry and configurations.
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Name = "DefaultPreemption"
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)
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// DefaultPreemption is a PostFilter plugin implements the preemption logic.
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type DefaultPreemption struct {
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fh framework.FrameworkHandle
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}
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var _ framework.PostFilterPlugin = &DefaultPreemption{}
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *DefaultPreemption) Name() string {
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return Name
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}
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// New initializes a new plugin and returns it.
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func New(_ runtime.Object, fh framework.FrameworkHandle) (framework.Plugin, error) {
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pl := DefaultPreemption{fh}
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if utilfeature.DefaultFeatureGate.Enabled(kubefeatures.PodDisruptionBudget) {
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// A hack to initialize pdbLister in sharedInformerFactory.
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fh.SharedInformerFactory().Policy().V1beta1().PodDisruptionBudgets().Lister()
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}
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return &pl, nil
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}
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// PostFilter invoked at the postFilter extension point.
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func (pl *DefaultPreemption) PostFilter(ctx context.Context, state *framework.CycleState, pod *v1.Pod, m framework.NodeToStatusMap) (*framework.PostFilterResult, *framework.Status) {
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preemptionStartTime := time.Now()
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defer func() {
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metrics.PreemptionAttempts.Inc()
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metrics.SchedulingAlgorithmPreemptionEvaluationDuration.Observe(metrics.SinceInSeconds(preemptionStartTime))
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metrics.DeprecatedSchedulingDuration.WithLabelValues(metrics.PreemptionEvaluation).Observe(metrics.SinceInSeconds(preemptionStartTime))
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}()
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nnn, err := core.Preempt(ctx, pl.fh, state, pod, m)
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if err != nil {
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return nil, framework.NewStatus(framework.Error, err.Error())
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}
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if nnn == "" {
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return nil, framework.NewStatus(framework.Unschedulable)
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}
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return &framework.PostFilterResult{NominatedNodeName: nnn}, framework.NewStatus(framework.Success)
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}
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