102 lines
3.3 KiB
Go
102 lines
3.3 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 core
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import (
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"k8s.io/autoscaler/cluster-autoscaler/utils"
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"reflect"
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apiv1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/autoscaler/cluster-autoscaler/processors/status"
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"k8s.io/autoscaler/cluster-autoscaler/utils/drain"
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pod_utils "k8s.io/autoscaler/cluster-autoscaler/utils/pod"
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)
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type podEquivalenceGroup struct {
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pods []*apiv1.Pod
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schedulingErrors map[string]status.Reasons
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schedulable bool
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}
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// buildPodEquivalenceGroups prepares pod groups with equivalent scheduling properties.
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func buildPodEquivalenceGroups(pods []*apiv1.Pod) []*podEquivalenceGroup {
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podEquivalenceGroups := []*podEquivalenceGroup{}
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for _, pods := range groupPodsBySchedulingProperties(pods) {
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podEquivalenceGroups = append(podEquivalenceGroups, &podEquivalenceGroup{
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pods: pods,
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schedulingErrors: map[string]status.Reasons{},
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schedulable: false,
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})
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}
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return podEquivalenceGroups
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}
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type equivalenceGroupId int
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type equivalenceGroup struct {
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id equivalenceGroupId
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representant *apiv1.Pod
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}
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const maxEquivalenceGroupsByController = 10
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// groupPodsBySchedulingProperties groups pods based on scheduling properties. Group ID is meaningless.
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// TODO(x13n): refactor this to have shared logic with PodSchedulableMap.
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func groupPodsBySchedulingProperties(pods []*apiv1.Pod) map[equivalenceGroupId][]*apiv1.Pod {
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podEquivalenceGroups := map[equivalenceGroupId][]*apiv1.Pod{}
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equivalenceGroupsByController := make(map[types.UID][]equivalenceGroup)
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var nextGroupId equivalenceGroupId
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for _, pod := range pods {
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controllerRef := drain.ControllerRef(pod)
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if controllerRef == nil || pod_utils.IsDaemonSetPod(pod) {
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podEquivalenceGroups[nextGroupId] = []*apiv1.Pod{pod}
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nextGroupId++
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continue
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}
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egs := equivalenceGroupsByController[controllerRef.UID]
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if gid := match(egs, pod); gid != nil {
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podEquivalenceGroups[*gid] = append(podEquivalenceGroups[*gid], pod)
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continue
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}
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if len(egs) < maxEquivalenceGroupsByController {
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// Avoid too many different pods per owner reference.
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newGroup := equivalenceGroup{
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id: nextGroupId,
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representant: pod,
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}
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equivalenceGroupsByController[controllerRef.UID] = append(egs, newGroup)
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}
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podEquivalenceGroups[nextGroupId] = append(podEquivalenceGroups[nextGroupId], pod)
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nextGroupId++
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}
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return podEquivalenceGroups
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}
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// match tries to find an equivalence group for a given pod and returns the
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// group id or nil if the group can't be found.
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func match(egs []equivalenceGroup, pod *apiv1.Pod) *equivalenceGroupId {
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for _, g := range egs {
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if reflect.DeepEqual(pod.Labels, g.representant.Labels) && utils.PodSpecSemanticallyEqual(pod.Spec, g.representant.Spec) {
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return &g.id
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}
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}
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return nil
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}
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