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119 lines
3.9 KiB
Go
119 lines
3.9 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 podtopologyspread
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import (
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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/client-go/informers"
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appslisters "k8s.io/client-go/listers/apps/v1"
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corelisters "k8s.io/client-go/listers/core/v1"
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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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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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const (
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// ErrReasonConstraintsNotMatch is used for PodTopologySpread filter error.
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ErrReasonConstraintsNotMatch = "node(s) didn't match pod topology spread constraints"
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// ErrReasonNodeLabelNotMatch is used when the node doesn't hold the required label.
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ErrReasonNodeLabelNotMatch = ErrReasonConstraintsNotMatch + " (missing required label)"
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)
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var systemDefaultConstraints = []v1.TopologySpreadConstraint{
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{
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TopologyKey: v1.LabelHostname,
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WhenUnsatisfiable: v1.ScheduleAnyway,
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MaxSkew: 3,
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},
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{
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TopologyKey: v1.LabelZoneFailureDomainStable,
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WhenUnsatisfiable: v1.ScheduleAnyway,
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MaxSkew: 5,
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},
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}
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// PodTopologySpread is a plugin that ensures pod's topologySpreadConstraints is satisfied.
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type PodTopologySpread struct {
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defaultConstraints []v1.TopologySpreadConstraint
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sharedLister framework.SharedLister
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services corelisters.ServiceLister
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replicationCtrls corelisters.ReplicationControllerLister
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replicaSets appslisters.ReplicaSetLister
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statefulSets appslisters.StatefulSetLister
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}
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var _ framework.PreFilterPlugin = &PodTopologySpread{}
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var _ framework.FilterPlugin = &PodTopologySpread{}
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var _ framework.PreScorePlugin = &PodTopologySpread{}
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var _ framework.ScorePlugin = &PodTopologySpread{}
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const (
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// Name is the name of the plugin used in the plugin registry and configurations.
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Name = "PodTopologySpread"
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)
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *PodTopologySpread) 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(plArgs runtime.Object, h framework.FrameworkHandle) (framework.Plugin, error) {
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if h.SnapshotSharedLister() == nil {
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return nil, fmt.Errorf("SnapshotSharedlister is nil")
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}
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args, err := getArgs(plArgs)
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if err != nil {
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return nil, err
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}
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if err := validation.ValidatePodTopologySpreadArgs(&args); err != nil {
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return nil, err
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}
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pl := &PodTopologySpread{
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sharedLister: h.SnapshotSharedLister(),
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defaultConstraints: args.DefaultConstraints,
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}
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if args.DefaultingType == config.SystemDefaulting {
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pl.defaultConstraints = systemDefaultConstraints
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}
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if len(pl.defaultConstraints) != 0 {
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if h.SharedInformerFactory() == nil {
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return nil, fmt.Errorf("SharedInformerFactory is nil")
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}
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pl.setListers(h.SharedInformerFactory())
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}
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return pl, nil
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}
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func getArgs(obj runtime.Object) (config.PodTopologySpreadArgs, error) {
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ptr, ok := obj.(*config.PodTopologySpreadArgs)
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if !ok {
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return config.PodTopologySpreadArgs{}, fmt.Errorf("want args to be of type PodTopologySpreadArgs, got %T", obj)
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}
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return *ptr, nil
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}
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func (pl *PodTopologySpread) setListers(factory informers.SharedInformerFactory) {
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pl.services = factory.Core().V1().Services().Lister()
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pl.replicationCtrls = factory.Core().V1().ReplicationControllers().Lister()
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pl.replicaSets = factory.Apps().V1().ReplicaSets().Lister()
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pl.statefulSets = factory.Apps().V1().StatefulSets().Lister()
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}
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