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EvenPodsSpread: Core Priority logic
This commit is contained in:
Wei Huang
parent
eefc18a763
commit
f25cc921e1
@ -15,3 +15,196 @@ limitations under the License.
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*/
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package priorities
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import (
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"context"
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"sync"
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"sync/atomic"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/client-go/util/workqueue"
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"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
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schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
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schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
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"k8s.io/klog"
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)
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type topologyPair struct {
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key string
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value string
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}
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type topologySpreadConstrantsMap struct {
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// The first error that we faced.
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firstError error
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sync.Mutex
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// counts store the mapping from node name to so-far computed score of
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// the node.
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counts map[string]*int64
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// total number of matching pods on each qualified <topologyKey:value> pair
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total int64
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// topologyPairToNodeNames store the mapping from potential <topologyKey:value>
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// pair to node names
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topologyPairToNodeNames map[topologyPair][]string
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}
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func newTopologySpreadConstrantsMap(len int) *topologySpreadConstrantsMap {
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return &topologySpreadConstrantsMap{
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counts: make(map[string]*int64, len),
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topologyPairToNodeNames: make(map[topologyPair][]string),
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}
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}
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func (t *topologySpreadConstrantsMap) setError(err error) {
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t.Lock()
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if t.firstError == nil {
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t.firstError = err
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}
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t.Unlock()
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}
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func (t *topologySpreadConstrantsMap) initialize(pod *v1.Pod, nodes []*v1.Node) {
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constraints := getSoftTopologySpreadConstraints(pod)
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for _, node := range nodes {
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labelSet := labels.Set(node.Labels)
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allMatch := true
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var pairs []topologyPair
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for _, constraint := range constraints {
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tpKey := constraint.TopologyKey
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if !labelSet.Has(tpKey) {
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allMatch = false
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break
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}
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pairs = append(pairs, topologyPair{key: tpKey, value: node.Labels[tpKey]})
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}
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if allMatch {
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for _, pair := range pairs {
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t.topologyPairToNodeNames[pair] = append(t.topologyPairToNodeNames[pair], node.Name)
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}
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t.counts[node.Name] = new(int64)
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}
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// for those nodes which don't have all required topologyKeys present, it's intentional to
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// leave counts[nodeName] as nil, so that we're able to score these nodes to 0 afterwards
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}
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}
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// CalculateEvenPodsSpreadPriority computes a score by checking through the topologySpreadConstraints
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// that are with WhenUnsatifiable=ScheduleAnyway (a.k.a soft constraint).
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// For each node (not only "filtered" nodes by Predicates), it adds the number of matching pods
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// (all topologySpreadConstraints must be satified) as a "weight" to any "filtered" node
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// which has the <topologyKey:value> pair present.
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// Then the sumed "weight" are normalized to 0~10, and the node(s) with the highest score are
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// the most preferred.
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// Symmetry is not considered.
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func CalculateEvenPodsSpreadPriority(pod *v1.Pod, nodeNameToInfo map[string]*schedulernodeinfo.NodeInfo, nodes []*v1.Node) (schedulerapi.HostPriorityList, error) {
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nodesLen := len(nodes)
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result := make(schedulerapi.HostPriorityList, nodesLen)
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// if incoming pod doesn't have soft topology spread constraints, return
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constraints := getSoftTopologySpreadConstraints(pod)
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if len(constraints) == 0 {
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return result, nil
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}
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t := newTopologySpreadConstrantsMap(len(nodes))
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t.initialize(pod, nodes)
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allNodeNames := make([]string, 0, len(nodeNameToInfo))
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for name := range nodeNameToInfo {
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allNodeNames = append(allNodeNames, name)
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}
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ctx, cancel := context.WithCancel(context.Background())
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processNode := func(i int) {
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nodeInfo := nodeNameToInfo[allNodeNames[i]]
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if node := nodeInfo.Node(); node != nil {
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// (1) `node` should satisfy incoming pod's NodeSelector/NodeAffinity
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// (2) All topologyKeys need to be present in `node`
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if !predicates.PodMatchesNodeSelectorAndAffinityTerms(pod, node) ||
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!predicates.NodeLabelsMatchSpreadConstraints(node.Labels, constraints) {
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return
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}
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matchCount := 0
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for _, existingPod := range nodeInfo.Pods() {
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match, err := predicates.PodMatchesAllSpreadConstraints(existingPod, pod.Namespace, constraints)
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if err != nil {
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t.setError(err)
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cancel()
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return
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}
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if match {
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matchCount++
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}
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}
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// add matchCount up to EACH node which is at least in one topology domain
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// with current node
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for _, constraint := range constraints {
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tpKey := constraint.TopologyKey
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pair := topologyPair{key: tpKey, value: node.Labels[tpKey]}
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for _, nodeName := range t.topologyPairToNodeNames[pair] {
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atomic.AddInt64(t.counts[nodeName], int64(matchCount))
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atomic.AddInt64(&t.total, int64(matchCount))
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}
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}
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}
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}
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workqueue.ParallelizeUntil(ctx, 16, len(allNodeNames), processNode)
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if t.firstError != nil {
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return nil, t.firstError
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}
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var maxCount, minCount int64
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for _, node := range nodes {
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if t.counts[node.Name] == nil {
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continue
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}
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// reverse
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count := t.total - *t.counts[node.Name]
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if count > maxCount {
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maxCount = count
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} else if count < minCount {
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minCount = count
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}
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t.counts[node.Name] = &count
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}
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// calculate final priority score for each node
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// TODO(Huang-Wei): in alpha version, we keep the formula as simple as possible.
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// current version ranks the nodes properly, but it doesn't take MaxSkew into
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// consideration, we may come up with a better formula in the future.
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maxMinDiff := maxCount - minCount
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for i := range nodes {
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node := nodes[i]
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result[i].Host = node.Name
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if t.counts[node.Name] == nil {
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result[i].Score = 0
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continue
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}
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if maxMinDiff == 0 {
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result[i].Score = schedulerapi.MaxPriority
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continue
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}
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fScore := float64(schedulerapi.MaxPriority) * (float64(*t.counts[node.Name]-minCount) / float64(maxMinDiff))
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// need to reverse b/c the more matching pods it has, the less qualified it is
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// result[i].Score = schedulerapi.MaxPriority - int(fScore)
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result[i].Score = int(fScore)
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if klog.V(10) {
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klog.Infof("%v -> %v: EvenPodsSpreadPriority, Score: (%d)", pod.Name, node.Name, int(fScore))
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}
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}
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return result, nil
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}
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// TODO(Huang-Wei): combine this with getHardTopologySpreadConstraints() in predicates package
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func getSoftTopologySpreadConstraints(pod *v1.Pod) (constraints []v1.TopologySpreadConstraint) {
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if pod != nil {
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for _, constraint := range pod.Spec.TopologySpreadConstraints {
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if constraint.WhenUnsatisfiable == v1.ScheduleAnyway {
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constraints = append(constraints, constraint)
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}
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}
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}
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return
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}
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302
pkg/scheduler/algorithm/priorities/even_pods_spread_test.go
Normal file
302
pkg/scheduler/algorithm/priorities/even_pods_spread_test.go
Normal file
@ -0,0 +1,302 @@
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/*
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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 priorities
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import (
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"reflect"
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"testing"
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"k8s.io/api/core/v1"
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schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
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schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
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u "k8s.io/kubernetes/pkg/scheduler/util"
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)
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func Test_topologySpreadConstrantsMap_initialize(t *testing.T) {
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tests := []struct {
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name string
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pod *v1.Pod
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nodes []*v1.Node
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want map[topologyPair][]string
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}{
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{
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name: "normal case",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "zone", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("zone", "zone1").Label("node", "node-a").Obj(),
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u.MakeNode().Name("node-b").Label("zone", "zone1").Label("node", "node-b").Obj(),
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u.MakeNode().Name("node-x").Label("zone", "zone2").Label("node", "node-x").Obj(),
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},
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want: map[topologyPair][]string{
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{key: "zone", value: "zone1"}: {"node-a", "node-b"},
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{key: "zone", value: "zone2"}: {"node-x"},
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{key: "node", value: "node-a"}: {"node-a"},
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{key: "node", value: "node-b"}: {"node-b"},
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{key: "node", value: "node-x"}: {"node-x"},
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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tMap := newTopologySpreadConstrantsMap(len(tt.nodes))
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tMap.initialize(tt.pod, tt.nodes)
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if !reflect.DeepEqual(tMap.topologyPairToNodeNames, tt.want) {
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t.Errorf("initilize().topologyPairToNodeNames = %#v, want %#v", tMap.topologyPairToNodeNames, tt.want)
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}
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})
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}
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}
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func TestCalculateEvenPodsSpreadPriority(t *testing.T) {
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tests := []struct {
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name string
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pod *v1.Pod
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existingPods []*v1.Pod
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nodes []*v1.Node
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failedNodes []*v1.Node // nodes + failedNodes = all nodes
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want schedulerapi.HostPriorityList
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}{
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// Explanation on the Legend:
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// a) X/Y means there are X matching pods on node1 and Y on node2, both nodes are candidates
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// (i.e. they have passed all predicates)
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// b) X/~Y~ means there are X matching pods on node1 and Y on node2, but node Y is NOT a candidate
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// c) X/?Y? means there are X matching pods on node1 and Y on node2, both nodes are candidates
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// but node2 either i) doesn't have all required topologyKeys present, or ii) doesn't match
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// incoming pod's nodeSelector/nodeAffinity
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{
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// if there is only one candidate node, it should be scored to 10
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name: "one constraint on node, no existing pods",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("node", "node-a").Obj(),
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u.MakeNode().Name("node-b").Label("node", "node-b").Obj(),
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},
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want: []schedulerapi.HostPriority{
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{Host: "node-a", Score: 10},
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{Host: "node-b", Score: 10},
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},
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},
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{
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// if there is only one candidate node, it should be scored to 10
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name: "one constraint on node, only one node is candidate",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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existingPods: []*v1.Pod{
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u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
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},
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("node", "node-a").Obj(),
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},
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failedNodes: []*v1.Node{
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u.MakeNode().Name("node-b").Label("node", "node-b").Obj(),
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},
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want: []schedulerapi.HostPriority{
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{Host: "node-a", Score: 10},
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},
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},
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{
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// matching pods spread as 2/1/0/3, total = 6
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// after reversing, it's 4/5/6/3
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// so scores = 40/6, 50/6, 60/6, 30/6
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name: "one constraint on node, all 4 nodes are candidates",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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existingPods: []*v1.Pod{
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u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
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u.MakePod().Name("p-d1").Node("node-d").Label("foo", "").Obj(),
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u.MakePod().Name("p-d2").Node("node-d").Label("foo", "").Obj(),
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u.MakePod().Name("p-d3").Node("node-d").Label("foo", "").Obj(),
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},
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("node", "node-a").Obj(),
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u.MakeNode().Name("node-b").Label("node", "node-b").Obj(),
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u.MakeNode().Name("node-c").Label("node", "node-c").Obj(),
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u.MakeNode().Name("node-d").Label("node", "node-d").Obj(),
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},
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failedNodes: []*v1.Node{},
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want: []schedulerapi.HostPriority{
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{Host: "node-a", Score: 6},
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{Host: "node-b", Score: 8},
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{Host: "node-c", Score: 10},
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{Host: "node-d", Score: 5},
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},
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},
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{
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// matching pods spread as 4/2/1/~3~, total = 4+2+1 = 7 (as node4 is not a candidate)
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// after reversing, it's 3/5/6
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// so scores = 30/6, 50/6, 60/6
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name: "one constraint on node, 3 out of 4 nodes are candidates",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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existingPods: []*v1.Pod{
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u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a3").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a4").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
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u.MakePod().Name("p-b2").Node("node-b").Label("foo", "").Obj(),
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u.MakePod().Name("p-x1").Node("node-x").Label("foo", "").Obj(),
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u.MakePod().Name("p-y1").Node("node-y").Label("foo", "").Obj(),
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u.MakePod().Name("p-y2").Node("node-y").Label("foo", "").Obj(),
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u.MakePod().Name("p-y3").Node("node-y").Label("foo", "").Obj(),
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},
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("node", "node-a").Obj(),
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u.MakeNode().Name("node-b").Label("node", "node-b").Obj(),
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u.MakeNode().Name("node-x").Label("node", "node-x").Obj(),
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},
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failedNodes: []*v1.Node{
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u.MakeNode().Name("node-y").Label("node", "node-y").Obj(),
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},
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want: []schedulerapi.HostPriority{
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{Host: "node-a", Score: 5},
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{Host: "node-b", Score: 8},
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{Host: "node-x", Score: 10},
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},
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},
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{
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// matching pods spread as 4/?2?/1/~3~, total = 4+?+1 = 5 (as node2 is problematic)
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// after reversing, it's 1/?/4
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// so scores = 10/4, 0, 40/4
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name: "one constraint on node, 3 out of 4 nodes are candidates",
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pod: u.MakePod().Name("p").Label("foo", "").
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SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
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Obj(),
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existingPods: []*v1.Pod{
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u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a3").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-a4").Node("node-a").Label("foo", "").Obj(),
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u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
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u.MakePod().Name("p-b2").Node("node-b").Label("foo", "").Obj(),
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u.MakePod().Name("p-x1").Node("node-x").Label("foo", "").Obj(),
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u.MakePod().Name("p-y1").Node("node-y").Label("foo", "").Obj(),
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u.MakePod().Name("p-y2").Node("node-y").Label("foo", "").Obj(),
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u.MakePod().Name("p-y3").Node("node-y").Label("foo", "").Obj(),
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},
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nodes: []*v1.Node{
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u.MakeNode().Name("node-a").Label("node", "node-a").Obj(),
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u.MakeNode().Name("node-b").Label("n", "node-b").Obj(), // label `n` doesn't match topologyKey
|
||||
u.MakeNode().Name("node-x").Label("node", "node-x").Obj(),
|
||||
},
|
||||
failedNodes: []*v1.Node{
|
||||
u.MakeNode().Name("node-y").Label("node", "node-y").Obj(),
|
||||
},
|
||||
want: []schedulerapi.HostPriority{
|
||||
{Host: "node-a", Score: 2},
|
||||
{Host: "node-b", Score: 0},
|
||||
{Host: "node-x", Score: 10},
|
||||
},
|
||||
},
|
||||
{
|
||||
// matching pods spread as 4/2/1/~3~, total = 6+6+4 = 16 (as topologyKey is zone instead of node)
|
||||
// after reversing, it's 10/10/12
|
||||
// so scores = 100/12, 100/12, 120/12
|
||||
name: "one constraint on zone, 3 out of 4 nodes are candidates",
|
||||
pod: u.MakePod().Name("p").Label("foo", "").
|
||||
SpreadConstraint(1, "zone", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
|
||||
Obj(),
|
||||
existingPods: []*v1.Pod{
|
||||
u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-a3").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-a4").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-b2").Node("node-b").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-x1").Node("node-x").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y1").Node("node-y").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y2").Node("node-y").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y3").Node("node-y").Label("foo", "").Obj(),
|
||||
},
|
||||
nodes: []*v1.Node{
|
||||
u.MakeNode().Name("node-a").Label("zone", "zone1").Label("node", "node-a").Obj(),
|
||||
u.MakeNode().Name("node-b").Label("zone", "zone1").Label("node", "node-b").Obj(),
|
||||
u.MakeNode().Name("node-x").Label("zone", "zone2").Label("node", "node-x").Obj(),
|
||||
},
|
||||
failedNodes: []*v1.Node{
|
||||
u.MakeNode().Name("node-y").Label("zone", "zone2").Label("node", "node-y").Obj(),
|
||||
},
|
||||
want: []schedulerapi.HostPriority{
|
||||
{Host: "node-a", Score: 8},
|
||||
{Host: "node-b", Score: 8},
|
||||
{Host: "node-x", Score: 10},
|
||||
},
|
||||
},
|
||||
{
|
||||
// matching pods spread as 2/~1~/2/~4~, total = 2+3 + 2+6 = 13 (zone and node should be both sumed up)
|
||||
// after reversing, it's 8/5
|
||||
// so scores = 80/8, 50/8
|
||||
name: "two constraint on zone and node, 2 out of 4 nodes are candidates",
|
||||
pod: u.MakePod().Name("p").Label("foo", "").
|
||||
SpreadConstraint(1, "zone", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
|
||||
SpreadConstraint(1, "node", softSpread, u.MakeLabelSelector().Exists("foo").Obj()).
|
||||
Obj(),
|
||||
existingPods: []*v1.Pod{
|
||||
u.MakePod().Name("p-a1").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-a2").Node("node-a").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-b1").Node("node-b").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-x1").Node("node-x").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-x2").Node("node-x").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y1").Node("node-y").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y2").Node("node-y").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y3").Node("node-y").Label("foo", "").Obj(),
|
||||
u.MakePod().Name("p-y4").Node("node-y").Label("foo", "").Obj(),
|
||||
},
|
||||
nodes: []*v1.Node{
|
||||
u.MakeNode().Name("node-a").Label("zone", "zone1").Label("node", "node-a").Obj(),
|
||||
u.MakeNode().Name("node-x").Label("zone", "zone2").Label("node", "node-x").Obj(),
|
||||
},
|
||||
failedNodes: []*v1.Node{
|
||||
u.MakeNode().Name("node-b").Label("zone", "zone1").Label("node", "node-b").Obj(),
|
||||
u.MakeNode().Name("node-y").Label("zone", "zone2").Label("node", "node-y").Obj(),
|
||||
},
|
||||
want: []schedulerapi.HostPriority{
|
||||
{Host: "node-a", Score: 10},
|
||||
{Host: "node-x", Score: 6},
|
||||
},
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
allNodes := append([]*v1.Node{}, tt.nodes...)
|
||||
allNodes = append(allNodes, tt.failedNodes...)
|
||||
nodeNameToInfo := schedulernodeinfo.CreateNodeNameToInfoMap(tt.existingPods, allNodes)
|
||||
|
||||
got, _ := CalculateEvenPodsSpreadPriority(tt.pod, nodeNameToInfo, tt.nodes)
|
||||
if !reflect.DeepEqual(got, tt.want) {
|
||||
t.Errorf("CalculateEvenPodsSpreadPriority() = %#v, want %#v", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
var (
|
||||
hardSpread = v1.DoNotSchedule
|
||||
softSpread = v1.ScheduleAnyway
|
||||
)
|
||||
Loading…
Reference in New Issue
Block a user