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525 lines
18 KiB
Go
525 lines
18 KiB
Go
/*
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Copyright 2014 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 scheduler
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import (
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"fmt"
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"math"
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"reflect"
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"strconv"
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"testing"
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"time"
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"k8s.io/kubernetes/pkg/api/resource"
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"k8s.io/kubernetes/pkg/api/v1"
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extensions "k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
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"k8s.io/kubernetes/pkg/util/sets"
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"k8s.io/kubernetes/pkg/util/wait"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
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algorithmpredicates "k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
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algorithmpriorities "k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/priorities"
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priorityutil "k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/priorities/util"
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schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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)
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func falsePredicate(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
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return false, []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate}, nil
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}
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func truePredicate(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
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return true, nil, nil
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}
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func matchesPredicate(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
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node := nodeInfo.Node()
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if node == nil {
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return false, nil, fmt.Errorf("node not found")
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}
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if pod.Name == node.Name {
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return true, nil, nil
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}
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return false, []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate}, nil
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}
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func hasNoPodsPredicate(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (bool, []algorithm.PredicateFailureReason, error) {
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if len(nodeInfo.Pods()) == 0 {
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return true, nil, nil
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}
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return false, []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate}, nil
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}
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func numericPriority(pod *v1.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*v1.Node) (schedulerapi.HostPriorityList, error) {
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result := []schedulerapi.HostPriority{}
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for _, node := range nodes {
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score, err := strconv.Atoi(node.Name)
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if err != nil {
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return nil, err
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}
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result = append(result, schedulerapi.HostPriority{
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Host: node.Name,
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Score: score,
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})
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}
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return result, nil
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}
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func reverseNumericPriority(pod *v1.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*v1.Node) (schedulerapi.HostPriorityList, error) {
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var maxScore float64
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minScore := math.MaxFloat64
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reverseResult := []schedulerapi.HostPriority{}
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result, err := numericPriority(pod, nodeNameToInfo, nodes)
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if err != nil {
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return nil, err
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}
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for _, hostPriority := range result {
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maxScore = math.Max(maxScore, float64(hostPriority.Score))
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minScore = math.Min(minScore, float64(hostPriority.Score))
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}
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for _, hostPriority := range result {
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reverseResult = append(reverseResult, schedulerapi.HostPriority{
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Host: hostPriority.Host,
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Score: int(maxScore + minScore - float64(hostPriority.Score)),
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})
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}
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return reverseResult, nil
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}
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func makeNodeList(nodeNames []string) []*v1.Node {
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result := make([]*v1.Node, 0, len(nodeNames))
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for _, nodeName := range nodeNames {
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result = append(result, &v1.Node{ObjectMeta: v1.ObjectMeta{Name: nodeName}})
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}
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return result
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}
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func TestSelectHost(t *testing.T) {
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scheduler := genericScheduler{}
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tests := []struct {
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list schedulerapi.HostPriorityList
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possibleHosts sets.String
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expectsErr bool
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}{
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{
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list: []schedulerapi.HostPriority{
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{Host: "machine1.1", Score: 1},
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{Host: "machine2.1", Score: 2},
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},
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possibleHosts: sets.NewString("machine2.1"),
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expectsErr: false,
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},
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// equal scores
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{
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list: []schedulerapi.HostPriority{
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{Host: "machine1.1", Score: 1},
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{Host: "machine1.2", Score: 2},
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{Host: "machine1.3", Score: 2},
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{Host: "machine2.1", Score: 2},
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},
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possibleHosts: sets.NewString("machine1.2", "machine1.3", "machine2.1"),
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expectsErr: false,
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},
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// out of order scores
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{
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list: []schedulerapi.HostPriority{
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{Host: "machine1.1", Score: 3},
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{Host: "machine1.2", Score: 3},
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{Host: "machine2.1", Score: 2},
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{Host: "machine3.1", Score: 1},
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{Host: "machine1.3", Score: 3},
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},
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possibleHosts: sets.NewString("machine1.1", "machine1.2", "machine1.3"),
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expectsErr: false,
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},
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// empty priorityList
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{
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list: []schedulerapi.HostPriority{},
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possibleHosts: sets.NewString(),
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expectsErr: true,
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},
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}
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for _, test := range tests {
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// increase the randomness
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for i := 0; i < 10; i++ {
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got, err := scheduler.selectHost(test.list)
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if test.expectsErr {
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if err == nil {
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t.Error("Unexpected non-error")
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}
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} else {
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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}
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if !test.possibleHosts.Has(got) {
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t.Errorf("got %s is not in the possible map %v", got, test.possibleHosts)
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}
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}
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}
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}
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}
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func TestGenericScheduler(t *testing.T) {
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tests := []struct {
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name string
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predicates map[string]algorithm.FitPredicate
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prioritizers []algorithm.PriorityConfig
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nodes []string
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pod *v1.Pod
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pods []*v1.Pod
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expectedHosts sets.String
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expectsErr bool
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wErr error
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}{
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{
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predicates: map[string]algorithm.FitPredicate{"false": falsePredicate},
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prioritizers: []algorithm.PriorityConfig{{Map: EqualPriorityMap, Weight: 1}},
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nodes: []string{"machine1", "machine2"},
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expectsErr: true,
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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name: "test 1",
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wErr: &FitError{
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Pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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FailedPredicates: FailedPredicateMap{
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"machine1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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"machine2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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}},
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},
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{
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predicates: map[string]algorithm.FitPredicate{"true": truePredicate},
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prioritizers: []algorithm.PriorityConfig{{Map: EqualPriorityMap, Weight: 1}},
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nodes: []string{"machine1", "machine2"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "ignore"}},
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expectedHosts: sets.NewString("machine1", "machine2"),
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name: "test 2",
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wErr: nil,
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},
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{
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// Fits on a machine where the pod ID matches the machine name
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predicates: map[string]algorithm.FitPredicate{"matches": matchesPredicate},
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prioritizers: []algorithm.PriorityConfig{{Map: EqualPriorityMap, Weight: 1}},
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nodes: []string{"machine1", "machine2"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "machine2"}},
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expectedHosts: sets.NewString("machine2"),
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name: "test 3",
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wErr: nil,
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},
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{
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predicates: map[string]algorithm.FitPredicate{"true": truePredicate},
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prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}},
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nodes: []string{"3", "2", "1"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "ignore"}},
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expectedHosts: sets.NewString("3"),
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name: "test 4",
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wErr: nil,
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},
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{
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predicates: map[string]algorithm.FitPredicate{"matches": matchesPredicate},
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prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}},
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nodes: []string{"3", "2", "1"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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expectedHosts: sets.NewString("2"),
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name: "test 5",
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wErr: nil,
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},
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{
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predicates: map[string]algorithm.FitPredicate{"true": truePredicate},
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prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}, {Function: reverseNumericPriority, Weight: 2}},
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nodes: []string{"3", "2", "1"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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expectedHosts: sets.NewString("1"),
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name: "test 6",
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wErr: nil,
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},
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{
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predicates: map[string]algorithm.FitPredicate{"true": truePredicate, "false": falsePredicate},
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prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}},
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nodes: []string{"3", "2", "1"},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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expectsErr: true,
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name: "test 7",
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wErr: &FitError{
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Pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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FailedPredicates: FailedPredicateMap{
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"3": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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"2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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"1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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},
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},
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},
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{
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predicates: map[string]algorithm.FitPredicate{
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"nopods": hasNoPodsPredicate,
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"matches": matchesPredicate,
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},
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pods: []*v1.Pod{
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{
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ObjectMeta: v1.ObjectMeta{Name: "2"},
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Spec: v1.PodSpec{
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NodeName: "2",
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},
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Status: v1.PodStatus{
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Phase: v1.PodRunning,
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},
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},
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},
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pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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prioritizers: []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}},
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nodes: []string{"1", "2"},
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expectsErr: true,
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name: "test 8",
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wErr: &FitError{
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Pod: &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "2"}},
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FailedPredicates: FailedPredicateMap{
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"1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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"2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
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},
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},
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},
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}
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for _, test := range tests {
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cache := schedulercache.New(time.Duration(0), wait.NeverStop)
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for _, pod := range test.pods {
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cache.AddPod(pod)
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}
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for _, name := range test.nodes {
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cache.AddNode(&v1.Node{ObjectMeta: v1.ObjectMeta{Name: name}})
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}
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scheduler := NewGenericScheduler(
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cache, test.predicates, algorithm.EmptyMetadataProducer, test.prioritizers, algorithm.EmptyMetadataProducer,
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[]algorithm.SchedulerExtender{})
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machine, err := scheduler.Schedule(test.pod, algorithm.FakeNodeLister(makeNodeList(test.nodes)))
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if !reflect.DeepEqual(err, test.wErr) {
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t.Errorf("Failed : %s, Unexpected error: %v, expected: %v", test.name, err, test.wErr)
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}
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if test.expectedHosts != nil && !test.expectedHosts.Has(machine) {
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t.Errorf("Failed : %s, Expected: %s, got: %s", test.name, test.expectedHosts, machine)
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}
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}
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}
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func TestFindFitAllError(t *testing.T) {
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nodes := []string{"3", "2", "1"}
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predicates := map[string]algorithm.FitPredicate{"true": truePredicate, "false": falsePredicate}
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nodeNameToInfo := map[string]*schedulercache.NodeInfo{
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"3": schedulercache.NewNodeInfo(),
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"2": schedulercache.NewNodeInfo(),
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"1": schedulercache.NewNodeInfo(),
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}
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_, predicateMap, err := findNodesThatFit(&v1.Pod{}, nodeNameToInfo, makeNodeList(nodes), predicates, nil, algorithm.EmptyMetadataProducer)
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if err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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if len(predicateMap) != len(nodes) {
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t.Errorf("unexpected failed predicate map: %v", predicateMap)
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}
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for _, node := range nodes {
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failures, found := predicateMap[node]
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if !found {
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t.Errorf("failed to find node: %s in %v", node, predicateMap)
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}
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if len(failures) != 1 || failures[0] != algorithmpredicates.ErrFakePredicate {
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t.Errorf("unexpected failures: %v", failures)
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}
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}
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}
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func TestFindFitSomeError(t *testing.T) {
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nodes := []string{"3", "2", "1"}
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predicates := map[string]algorithm.FitPredicate{"true": truePredicate, "match": matchesPredicate}
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pod := &v1.Pod{ObjectMeta: v1.ObjectMeta{Name: "1"}}
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nodeNameToInfo := map[string]*schedulercache.NodeInfo{
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"3": schedulercache.NewNodeInfo(),
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"2": schedulercache.NewNodeInfo(),
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"1": schedulercache.NewNodeInfo(pod),
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}
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for name := range nodeNameToInfo {
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nodeNameToInfo[name].SetNode(&v1.Node{ObjectMeta: v1.ObjectMeta{Name: name}})
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}
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_, predicateMap, err := findNodesThatFit(pod, nodeNameToInfo, makeNodeList(nodes), predicates, nil, algorithm.EmptyMetadataProducer)
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if err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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if len(predicateMap) != (len(nodes) - 1) {
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t.Errorf("unexpected failed predicate map: %v", predicateMap)
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}
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for _, node := range nodes {
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if node == pod.Name {
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continue
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}
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failures, found := predicateMap[node]
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if !found {
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t.Errorf("failed to find node: %s in %v", node, predicateMap)
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}
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if len(failures) != 1 || failures[0] != algorithmpredicates.ErrFakePredicate {
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t.Errorf("unexpected failures: %v", failures)
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}
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}
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}
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func makeNode(node string, milliCPU, memory int64) *v1.Node {
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return &v1.Node{
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ObjectMeta: v1.ObjectMeta{Name: node},
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Status: v1.NodeStatus{
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Capacity: v1.ResourceList{
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"cpu": *resource.NewMilliQuantity(milliCPU, resource.DecimalSI),
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"memory": *resource.NewQuantity(memory, resource.BinarySI),
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},
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Allocatable: v1.ResourceList{
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"cpu": *resource.NewMilliQuantity(milliCPU, resource.DecimalSI),
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"memory": *resource.NewQuantity(memory, resource.BinarySI),
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},
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},
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}
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}
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// The point of this test is to show that you:
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// - get the same priority for a zero-request pod as for a pod with the defaults requests,
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// both when the zero-request pod is already on the machine and when the zero-request pod
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// is the one being scheduled.
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// - don't get the same score no matter what we schedule.
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func TestZeroRequest(t *testing.T) {
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// A pod with no resources. We expect spreading to count it as having the default resources.
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noResources := v1.PodSpec{
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Containers: []v1.Container{
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{},
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},
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}
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noResources1 := noResources
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noResources1.NodeName = "machine1"
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// A pod with the same resources as a 0-request pod gets by default as its resources (for spreading).
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small := v1.PodSpec{
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Containers: []v1.Container{
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{
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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"cpu": resource.MustParse(
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strconv.FormatInt(priorityutil.DefaultMilliCpuRequest, 10) + "m"),
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"memory": resource.MustParse(
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strconv.FormatInt(priorityutil.DefaultMemoryRequest, 10)),
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},
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},
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},
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},
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}
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small2 := small
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small2.NodeName = "machine2"
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// A larger pod.
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large := v1.PodSpec{
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Containers: []v1.Container{
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{
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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"cpu": resource.MustParse(
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strconv.FormatInt(priorityutil.DefaultMilliCpuRequest*3, 10) + "m"),
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"memory": resource.MustParse(
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strconv.FormatInt(priorityutil.DefaultMemoryRequest*3, 10)),
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},
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},
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},
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},
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}
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large1 := large
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large1.NodeName = "machine1"
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large2 := large
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large2.NodeName = "machine2"
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tests := []struct {
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pod *v1.Pod
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pods []*v1.Pod
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nodes []*v1.Node
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test string
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}{
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// The point of these next two tests is to show you get the same priority for a zero-request pod
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// as for a pod with the defaults requests, both when the zero-request pod is already on the machine
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// and when the zero-request pod is the one being scheduled.
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{
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pod: &v1.Pod{Spec: noResources},
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nodes: []*v1.Node{makeNode("machine1", 1000, priorityutil.DefaultMemoryRequest*10), makeNode("machine2", 1000, priorityutil.DefaultMemoryRequest*10)},
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test: "test priority of zero-request pod with machine with zero-request pod",
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pods: []*v1.Pod{
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{Spec: large1}, {Spec: noResources1},
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{Spec: large2}, {Spec: small2},
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},
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},
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{
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pod: &v1.Pod{Spec: small},
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nodes: []*v1.Node{makeNode("machine1", 1000, priorityutil.DefaultMemoryRequest*10), makeNode("machine2", 1000, priorityutil.DefaultMemoryRequest*10)},
|
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test: "test priority of nonzero-request pod with machine with zero-request pod",
|
|
pods: []*v1.Pod{
|
|
{Spec: large1}, {Spec: noResources1},
|
|
{Spec: large2}, {Spec: small2},
|
|
},
|
|
},
|
|
// The point of this test is to verify that we're not just getting the same score no matter what we schedule.
|
|
{
|
|
pod: &v1.Pod{Spec: large},
|
|
nodes: []*v1.Node{makeNode("machine1", 1000, priorityutil.DefaultMemoryRequest*10), makeNode("machine2", 1000, priorityutil.DefaultMemoryRequest*10)},
|
|
test: "test priority of larger pod with machine with zero-request pod",
|
|
pods: []*v1.Pod{
|
|
{Spec: large1}, {Spec: noResources1},
|
|
{Spec: large2}, {Spec: small2},
|
|
},
|
|
},
|
|
}
|
|
|
|
const expectedPriority int = 25
|
|
for _, test := range tests {
|
|
// This should match the configuration in defaultPriorities() in
|
|
// plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go if you want
|
|
// to test what's actually in production.
|
|
priorityConfigs := []algorithm.PriorityConfig{
|
|
{Map: algorithmpriorities.LeastRequestedPriorityMap, Weight: 1},
|
|
{Map: algorithmpriorities.BalancedResourceAllocationMap, Weight: 1},
|
|
{
|
|
Function: algorithmpriorities.NewSelectorSpreadPriority(
|
|
algorithm.FakeServiceLister([]*v1.Service{}),
|
|
algorithm.FakeControllerLister([]*v1.ReplicationController{}),
|
|
algorithm.FakeReplicaSetLister([]*extensions.ReplicaSet{})),
|
|
Weight: 1,
|
|
},
|
|
}
|
|
nodeNameToInfo := schedulercache.CreateNodeNameToInfoMap(test.pods, test.nodes)
|
|
list, err := PrioritizeNodes(
|
|
test.pod, nodeNameToInfo, algorithm.EmptyMetadataProducer, priorityConfigs,
|
|
algorithm.FakeNodeLister(test.nodes), []algorithm.SchedulerExtender{})
|
|
if err != nil {
|
|
t.Errorf("unexpected error: %v", err)
|
|
}
|
|
for _, hp := range list {
|
|
if test.test == "test priority of larger pod with machine with zero-request pod" {
|
|
if hp.Score == expectedPriority {
|
|
t.Errorf("%s: expected non-%d for all priorities, got list %#v", test.test, expectedPriority, list)
|
|
}
|
|
} else {
|
|
if hp.Score != expectedPriority {
|
|
t.Errorf("%s: expected %d for all priorities, got list %#v", test.test, expectedPriority, list)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|