521 lines
17 KiB
Go
521 lines
17 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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"errors"
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"fmt"
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"reflect"
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"testing"
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"time"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/diff"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/api/resource"
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"k8s.io/kubernetes/pkg/api/testapi"
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"k8s.io/kubernetes/pkg/api/v1"
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clientcache "k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/client/record"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
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"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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schedulertesting "k8s.io/kubernetes/plugin/pkg/scheduler/testing"
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)
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type fakeBinder struct {
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b func(binding *v1.Binding) error
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}
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func (fb fakeBinder) Bind(binding *v1.Binding) error { return fb.b(binding) }
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type fakePodConditionUpdater struct{}
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func (fc fakePodConditionUpdater) Update(pod *v1.Pod, podCondition *v1.PodCondition) error {
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return nil
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}
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func podWithID(id, desiredHost string) *v1.Pod {
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return &v1.Pod{
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ObjectMeta: v1.ObjectMeta{Name: id, SelfLink: testapi.Default.SelfLink("pods", id)},
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Spec: v1.PodSpec{
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NodeName: desiredHost,
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},
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}
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}
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func podWithPort(id, desiredHost string, port int) *v1.Pod {
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pod := podWithID(id, desiredHost)
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pod.Spec.Containers = []v1.Container{
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{Name: "ctr", Ports: []v1.ContainerPort{{HostPort: int32(port)}}},
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}
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return pod
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}
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func podWithResources(id, desiredHost string, limits v1.ResourceList, requests v1.ResourceList) *v1.Pod {
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pod := podWithID(id, desiredHost)
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pod.Spec.Containers = []v1.Container{
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{Name: "ctr", Resources: v1.ResourceRequirements{Limits: limits, Requests: requests}},
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}
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return pod
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}
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type mockScheduler struct {
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machine string
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err error
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}
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func (es mockScheduler) Schedule(pod *v1.Pod, ml algorithm.NodeLister) (string, error) {
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return es.machine, es.err
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}
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func TestScheduler(t *testing.T) {
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartLogging(t.Logf).Stop()
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errS := errors.New("scheduler")
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errB := errors.New("binder")
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testNode := v1.Node{ObjectMeta: v1.ObjectMeta{Name: "machine1"}}
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table := []struct {
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injectBindError error
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sendPod *v1.Pod
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algo algorithm.ScheduleAlgorithm
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expectErrorPod *v1.Pod
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expectAssumedPod *v1.Pod
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expectError error
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expectBind *v1.Binding
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eventReason string
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}{
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{
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sendPod: podWithID("foo", ""),
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algo: mockScheduler{testNode.Name, nil},
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expectBind: &v1.Binding{ObjectMeta: v1.ObjectMeta{Name: "foo"}, Target: v1.ObjectReference{Kind: "Node", Name: testNode.Name}},
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expectAssumedPod: podWithID("foo", testNode.Name),
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eventReason: "Scheduled",
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}, {
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sendPod: podWithID("foo", ""),
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algo: mockScheduler{testNode.Name, errS},
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expectError: errS,
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expectErrorPod: podWithID("foo", ""),
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eventReason: "FailedScheduling",
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}, {
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sendPod: podWithID("foo", ""),
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algo: mockScheduler{testNode.Name, nil},
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expectBind: &v1.Binding{ObjectMeta: v1.ObjectMeta{Name: "foo"}, Target: v1.ObjectReference{Kind: "Node", Name: testNode.Name}},
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expectAssumedPod: podWithID("foo", testNode.Name),
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injectBindError: errB,
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expectError: errB,
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expectErrorPod: podWithID("foo", ""),
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eventReason: "FailedScheduling",
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},
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}
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for i, item := range table {
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var gotError error
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var gotPod *v1.Pod
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var gotAssumedPod *v1.Pod
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var gotBinding *v1.Binding
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c := &Config{
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SchedulerCache: &schedulertesting.FakeCache{
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AssumeFunc: func(pod *v1.Pod) {
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gotAssumedPod = pod
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},
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},
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NodeLister: algorithm.FakeNodeLister(
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[]*v1.Node{&testNode},
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),
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Algorithm: item.algo,
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Binder: fakeBinder{func(b *v1.Binding) error {
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gotBinding = b
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return item.injectBindError
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}},
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PodConditionUpdater: fakePodConditionUpdater{},
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Error: func(p *v1.Pod, err error) {
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gotPod = p
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gotError = err
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},
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NextPod: func() *v1.Pod {
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return item.sendPod
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},
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Recorder: eventBroadcaster.NewRecorder(v1.EventSource{Component: "scheduler"}),
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}
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s := New(c)
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called := make(chan struct{})
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events := eventBroadcaster.StartEventWatcher(func(e *v1.Event) {
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if e, a := item.eventReason, e.Reason; e != a {
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t.Errorf("%v: expected %v, got %v", i, e, a)
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}
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close(called)
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})
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s.scheduleOne()
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<-called
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if e, a := item.expectAssumedPod, gotAssumedPod; !reflect.DeepEqual(e, a) {
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t.Errorf("%v: assumed pod: wanted %v, got %v", i, e, a)
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}
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if e, a := item.expectErrorPod, gotPod; !reflect.DeepEqual(e, a) {
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t.Errorf("%v: error pod: wanted %v, got %v", i, e, a)
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}
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if e, a := item.expectError, gotError; !reflect.DeepEqual(e, a) {
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t.Errorf("%v: error: wanted %v, got %v", i, e, a)
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}
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if e, a := item.expectBind, gotBinding; !reflect.DeepEqual(e, a) {
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t.Errorf("%v: error: %s", i, diff.ObjectDiff(e, a))
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}
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events.Stop()
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}
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}
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func TestSchedulerNoPhantomPodAfterExpire(t *testing.T) {
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stop := make(chan struct{})
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defer close(stop)
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queuedPodStore := clientcache.NewFIFO(clientcache.MetaNamespaceKeyFunc)
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scache := schedulercache.New(100*time.Millisecond, stop)
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pod := podWithPort("pod.Name", "", 8080)
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node := v1.Node{ObjectMeta: v1.ObjectMeta{Name: "machine1"}}
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scache.AddNode(&node)
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nodeLister := algorithm.FakeNodeLister([]*v1.Node{&node})
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predicateMap := map[string]algorithm.FitPredicate{"PodFitsHostPorts": predicates.PodFitsHostPorts}
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scheduler, bindingChan, _ := setupTestSchedulerWithOnePodOnNode(t, queuedPodStore, scache, nodeLister, predicateMap, pod, &node)
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waitPodExpireChan := make(chan struct{})
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timeout := make(chan struct{})
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go func() {
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for {
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select {
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case <-timeout:
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return
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default:
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}
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pods, err := scache.List(labels.Everything())
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if err != nil {
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t.Fatalf("cache.List failed: %v", err)
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}
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if len(pods) == 0 {
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close(waitPodExpireChan)
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return
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}
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time.Sleep(100 * time.Millisecond)
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}
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}()
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// waiting for the assumed pod to expire
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select {
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case <-waitPodExpireChan:
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case <-time.After(wait.ForeverTestTimeout):
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close(timeout)
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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// We use conflicted pod ports to incur fit predicate failure if first pod not removed.
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secondPod := podWithPort("bar", "", 8080)
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queuedPodStore.Add(secondPod)
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scheduler.scheduleOne()
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select {
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case b := <-bindingChan:
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expectBinding := &v1.Binding{
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ObjectMeta: v1.ObjectMeta{Name: "bar"},
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Target: v1.ObjectReference{Kind: "Node", Name: node.Name},
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}
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if !reflect.DeepEqual(expectBinding, b) {
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t.Errorf("binding want=%v, get=%v", expectBinding, b)
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}
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case <-time.After(wait.ForeverTestTimeout):
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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}
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func TestSchedulerNoPhantomPodAfterDelete(t *testing.T) {
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stop := make(chan struct{})
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defer close(stop)
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queuedPodStore := clientcache.NewFIFO(clientcache.MetaNamespaceKeyFunc)
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scache := schedulercache.New(10*time.Minute, stop)
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firstPod := podWithPort("pod.Name", "", 8080)
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node := v1.Node{ObjectMeta: v1.ObjectMeta{Name: "machine1"}}
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scache.AddNode(&node)
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nodeLister := algorithm.FakeNodeLister([]*v1.Node{&node})
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predicateMap := map[string]algorithm.FitPredicate{"PodFitsHostPorts": predicates.PodFitsHostPorts}
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scheduler, bindingChan, errChan := setupTestSchedulerWithOnePodOnNode(t, queuedPodStore, scache, nodeLister, predicateMap, firstPod, &node)
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// We use conflicted pod ports to incur fit predicate failure.
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secondPod := podWithPort("bar", "", 8080)
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queuedPodStore.Add(secondPod)
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// queuedPodStore: [bar:8080]
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// cache: [(assumed)foo:8080]
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scheduler.scheduleOne()
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select {
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case err := <-errChan:
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expectErr := &FitError{
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Pod: secondPod,
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FailedPredicates: FailedPredicateMap{node.Name: []algorithm.PredicateFailureReason{predicates.ErrPodNotFitsHostPorts}},
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}
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if !reflect.DeepEqual(expectErr, err) {
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t.Errorf("err want=%v, get=%v", expectErr, err)
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}
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case <-time.After(wait.ForeverTestTimeout):
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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// We mimic the workflow of cache behavior when a pod is removed by user.
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// Note: if the schedulercache timeout would be super short, the first pod would expire
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// and would be removed itself (without any explicit actions on schedulercache). Even in that case,
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// explicitly AddPod will as well correct the behavior.
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firstPod.Spec.NodeName = node.Name
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if err := scache.AddPod(firstPod); err != nil {
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t.Fatalf("err: %v", err)
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}
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if err := scache.RemovePod(firstPod); err != nil {
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t.Fatalf("err: %v", err)
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}
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queuedPodStore.Add(secondPod)
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scheduler.scheduleOne()
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select {
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case b := <-bindingChan:
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expectBinding := &v1.Binding{
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ObjectMeta: v1.ObjectMeta{Name: "bar"},
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Target: v1.ObjectReference{Kind: "Node", Name: node.Name},
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}
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if !reflect.DeepEqual(expectBinding, b) {
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t.Errorf("binding want=%v, get=%v", expectBinding, b)
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}
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case <-time.After(wait.ForeverTestTimeout):
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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}
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// Scheduler should preserve predicate constraint even if binding was longer
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// than cache ttl
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func TestSchedulerErrorWithLongBinding(t *testing.T) {
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stop := make(chan struct{})
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defer close(stop)
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firstPod := podWithPort("foo", "", 8080)
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conflictPod := podWithPort("bar", "", 8080)
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pods := map[string]*v1.Pod{firstPod.Name: firstPod, conflictPod.Name: conflictPod}
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for _, test := range []struct {
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Expected map[string]bool
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CacheTTL time.Duration
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BindingDuration time.Duration
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}{
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{
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Expected: map[string]bool{firstPod.Name: true},
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CacheTTL: 100 * time.Millisecond,
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BindingDuration: 300 * time.Millisecond,
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},
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{
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Expected: map[string]bool{firstPod.Name: true},
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CacheTTL: 10 * time.Second,
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BindingDuration: 300 * time.Millisecond,
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},
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} {
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queuedPodStore := clientcache.NewFIFO(clientcache.MetaNamespaceKeyFunc)
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scache := schedulercache.New(test.CacheTTL, stop)
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node := v1.Node{ObjectMeta: v1.ObjectMeta{Name: "machine1"}}
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scache.AddNode(&node)
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nodeLister := algorithm.FakeNodeLister([]*v1.Node{&node})
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predicateMap := map[string]algorithm.FitPredicate{"PodFitsHostPorts": predicates.PodFitsHostPorts}
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scheduler, bindingChan := setupTestSchedulerLongBindingWithRetry(
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queuedPodStore, scache, nodeLister, predicateMap, stop, test.BindingDuration)
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scheduler.Run()
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queuedPodStore.Add(firstPod)
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queuedPodStore.Add(conflictPod)
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resultBindings := map[string]bool{}
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waitChan := time.After(5 * time.Second)
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for finished := false; !finished; {
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select {
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case b := <-bindingChan:
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resultBindings[b.Name] = true
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p := pods[b.Name]
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p.Spec.NodeName = b.Target.Name
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scache.AddPod(p)
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case <-waitChan:
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finished = true
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}
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}
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if !reflect.DeepEqual(resultBindings, test.Expected) {
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t.Errorf("Result binding are not equal to expected. %v != %v", resultBindings, test.Expected)
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}
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}
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}
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// queuedPodStore: pods queued before processing.
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// cache: scheduler cache that might contain assumed pods.
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func setupTestSchedulerWithOnePodOnNode(t *testing.T, queuedPodStore *clientcache.FIFO, scache schedulercache.Cache,
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nodeLister algorithm.FakeNodeLister, predicateMap map[string]algorithm.FitPredicate, pod *v1.Pod, node *v1.Node) (*Scheduler, chan *v1.Binding, chan error) {
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scheduler, bindingChan, errChan := setupTestScheduler(queuedPodStore, scache, nodeLister, predicateMap)
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queuedPodStore.Add(pod)
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// queuedPodStore: [foo:8080]
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// cache: []
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scheduler.scheduleOne()
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// queuedPodStore: []
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// cache: [(assumed)foo:8080]
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select {
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case b := <-bindingChan:
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expectBinding := &v1.Binding{
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ObjectMeta: v1.ObjectMeta{Name: pod.Name},
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Target: v1.ObjectReference{Kind: "Node", Name: node.Name},
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}
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if !reflect.DeepEqual(expectBinding, b) {
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t.Errorf("binding want=%v, get=%v", expectBinding, b)
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}
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case <-time.After(wait.ForeverTestTimeout):
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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return scheduler, bindingChan, errChan
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}
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func TestSchedulerFailedSchedulingReasons(t *testing.T) {
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stop := make(chan struct{})
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defer close(stop)
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queuedPodStore := clientcache.NewFIFO(clientcache.MetaNamespaceKeyFunc)
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scache := schedulercache.New(10*time.Minute, stop)
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// Design the baseline for the pods, and we will make nodes that dont fit it later.
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var cpu = int64(4)
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var mem = int64(500)
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podWithTooBigResourceRequests := podWithResources("bar", "", v1.ResourceList{
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v1.ResourceCPU: *(resource.NewQuantity(cpu, resource.DecimalSI)),
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v1.ResourceMemory: *(resource.NewQuantity(mem, resource.DecimalSI)),
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}, v1.ResourceList{
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v1.ResourceCPU: *(resource.NewQuantity(cpu, resource.DecimalSI)),
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v1.ResourceMemory: *(resource.NewQuantity(mem, resource.DecimalSI)),
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})
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// create several nodes which cannot schedule the above pod
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nodes := []*v1.Node{}
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for i := 0; i < 100; i++ {
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node := v1.Node{
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ObjectMeta: v1.ObjectMeta{Name: fmt.Sprintf("machine%v", i)},
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Status: v1.NodeStatus{
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Capacity: v1.ResourceList{
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v1.ResourceCPU: *(resource.NewQuantity(cpu/2, resource.DecimalSI)),
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v1.ResourceMemory: *(resource.NewQuantity(mem/5, resource.DecimalSI)),
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v1.ResourcePods: *(resource.NewQuantity(10, resource.DecimalSI)),
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},
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Allocatable: v1.ResourceList{
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v1.ResourceCPU: *(resource.NewQuantity(cpu/2, resource.DecimalSI)),
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v1.ResourceMemory: *(resource.NewQuantity(mem/5, resource.DecimalSI)),
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v1.ResourcePods: *(resource.NewQuantity(10, resource.DecimalSI)),
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}},
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}
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scache.AddNode(&node)
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nodes = append(nodes, &node)
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}
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nodeLister := algorithm.FakeNodeLister(nodes)
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predicateMap := map[string]algorithm.FitPredicate{
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"PodFitsResources": predicates.PodFitsResources,
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}
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// Create expected failure reasons for all the nodes. Hopefully they will get rolled up into a non-spammy summary.
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failedPredicatesMap := FailedPredicateMap{}
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for _, node := range nodes {
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failedPredicatesMap[node.Name] = []algorithm.PredicateFailureReason{
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predicates.NewInsufficientResourceError(v1.ResourceCPU, 4000, 0, 2000),
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predicates.NewInsufficientResourceError(v1.ResourceMemory, 500, 0, 100),
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}
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}
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scheduler, _, errChan := setupTestScheduler(queuedPodStore, scache, nodeLister, predicateMap)
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queuedPodStore.Add(podWithTooBigResourceRequests)
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scheduler.scheduleOne()
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select {
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case err := <-errChan:
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expectErr := &FitError{
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Pod: podWithTooBigResourceRequests,
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FailedPredicates: failedPredicatesMap,
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}
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if len(fmt.Sprint(expectErr)) > 150 {
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t.Errorf("message is too spammy ! %v ", len(fmt.Sprint(expectErr)))
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}
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if !reflect.DeepEqual(expectErr, err) {
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t.Errorf("\n err \nWANT=%+v,\nGOT=%+v", expectErr, err)
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}
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case <-time.After(wait.ForeverTestTimeout):
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t.Fatalf("timeout after %v", wait.ForeverTestTimeout)
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}
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}
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// queuedPodStore: pods queued before processing.
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// scache: scheduler cache that might contain assumed pods.
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func setupTestScheduler(queuedPodStore *clientcache.FIFO, scache schedulercache.Cache, nodeLister algorithm.FakeNodeLister, predicateMap map[string]algorithm.FitPredicate) (*Scheduler, chan *v1.Binding, chan error) {
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algo := NewGenericScheduler(
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scache,
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predicateMap,
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algorithm.EmptyMetadataProducer,
|
|
[]algorithm.PriorityConfig{},
|
|
algorithm.EmptyMetadataProducer,
|
|
[]algorithm.SchedulerExtender{})
|
|
bindingChan := make(chan *v1.Binding, 1)
|
|
errChan := make(chan error, 1)
|
|
cfg := &Config{
|
|
SchedulerCache: scache,
|
|
NodeLister: nodeLister,
|
|
Algorithm: algo,
|
|
Binder: fakeBinder{func(b *v1.Binding) error {
|
|
bindingChan <- b
|
|
return nil
|
|
}},
|
|
NextPod: func() *v1.Pod {
|
|
return clientcache.Pop(queuedPodStore).(*v1.Pod)
|
|
},
|
|
Error: func(p *v1.Pod, err error) {
|
|
errChan <- err
|
|
},
|
|
Recorder: &record.FakeRecorder{},
|
|
PodConditionUpdater: fakePodConditionUpdater{},
|
|
}
|
|
return New(cfg), bindingChan, errChan
|
|
}
|
|
|
|
func setupTestSchedulerLongBindingWithRetry(queuedPodStore *clientcache.FIFO, scache schedulercache.Cache, nodeLister algorithm.FakeNodeLister, predicateMap map[string]algorithm.FitPredicate, stop chan struct{}, bindingTime time.Duration) (*Scheduler, chan *v1.Binding) {
|
|
algo := NewGenericScheduler(
|
|
scache,
|
|
predicateMap,
|
|
algorithm.EmptyMetadataProducer,
|
|
[]algorithm.PriorityConfig{},
|
|
algorithm.EmptyMetadataProducer,
|
|
[]algorithm.SchedulerExtender{})
|
|
bindingChan := make(chan *v1.Binding, 2)
|
|
cfg := &Config{
|
|
SchedulerCache: scache,
|
|
NodeLister: nodeLister,
|
|
Algorithm: algo,
|
|
Binder: fakeBinder{func(b *v1.Binding) error {
|
|
time.Sleep(bindingTime)
|
|
bindingChan <- b
|
|
return nil
|
|
}},
|
|
NextPod: func() *v1.Pod {
|
|
return clientcache.Pop(queuedPodStore).(*v1.Pod)
|
|
},
|
|
Error: func(p *v1.Pod, err error) {
|
|
queuedPodStore.AddIfNotPresent(p)
|
|
},
|
|
Recorder: &record.FakeRecorder{},
|
|
PodConditionUpdater: fakePodConditionUpdater{},
|
|
StopEverything: stop,
|
|
}
|
|
return New(cfg), bindingChan
|
|
}
|