kube-scheduler: move stopCh creation out of scheduler factory code

Enforces clean ownership of the channel.

cmd/kube-scheduler/app/server.go

@@ -160,6 +160,7 @@ func run(cmd *cobra.Command, args []string, opts *options.Options) error {
 		storageClassInformer,
 		c.Recorder,
 		c.ComponentConfig.AlgorithmSource,
+		stopCh,
 		scheduler.WithName(c.ComponentConfig.SchedulerName),
 		scheduler.WithHardPodAffinitySymmetricWeight(c.ComponentConfig.HardPodAffinitySymmetricWeight),
 		scheduler.WithEquivalenceClassCacheEnabled(c.ComponentConfig.EnableContentionProfiling),

pkg/scheduler/factory/BUILD

@@ -37,6 +37,7 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
         "//staging/src/k8s.io/client-go/informers/apps/v1:go_default_library",
         "//staging/src/k8s.io/client-go/informers/core/v1:go_default_library",

pkg/scheduler/factory/factory.go

@@ -37,6 +37,7 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	appsinformers "k8s.io/client-go/informers/apps/v1"
 	coreinformers "k8s.io/client-go/informers/core/v1"
@@ -127,7 +128,7 @@ type Config struct {
 	Recorder record.EventRecorder
 
 	// Close this to shut down the scheduler.
-	StopEverything chan struct{}
+	StopEverything <-chan struct{}
 
 	// VolumeBinder handles PVC/PV binding for the pod.
 	VolumeBinder *volumebinder.VolumeBinder
@@ -200,7 +201,7 @@ type configFactory struct {
 	storageClassLister storagelisters.StorageClassLister
 
 	// Close this to stop all reflectors
-	StopEverything chan struct{}
+	StopEverything <-chan struct{}
 
 	scheduledPodsHasSynced cache.InformerSynced
 
@@ -253,12 +254,16 @@ type ConfigFactoryArgs struct {
 	DisablePreemption              bool
 	PercentageOfNodesToScore       int32
 	BindTimeoutSeconds             int64
+	StopCh                         <-chan struct{}
 }
 
 // NewConfigFactory initializes the default implementation of a Configurator. To encourage eventual privatization of the struct type, we only
 // return the interface.
 func NewConfigFactory(args *ConfigFactoryArgs) Configurator {
-	stopEverything := make(chan struct{})
+	stopEverything := args.StopCh
+	if stopEverything == nil {
+		stopEverything = wait.NeverStop
+	}
 	schedulerCache := schedulerinternalcache.New(30*time.Second, stopEverything)
 
 	// storageClassInformer is only enabled through VolumeScheduling feature gate

pkg/scheduler/factory/factory_test.go

@@ -52,7 +52,9 @@ const (
 
 func TestCreate(t *testing.T) {
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 	factory.Create()
 }
 
@@ -63,7 +65,9 @@ func TestCreateFromConfig(t *testing.T) {
 	var policy schedulerapi.Policy
 
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 
 	// Pre-register some predicate and priority functions
 	RegisterFitPredicate("PredicateOne", PredicateOne)
@@ -101,7 +105,9 @@ func TestCreateFromConfigWithHardPodAffinitySymmetricWeight(t *testing.T) {
 	var policy schedulerapi.Policy
 
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 
 	// Pre-register some predicate and priority functions
 	RegisterFitPredicate("PredicateOne", PredicateOne)
@@ -140,7 +146,9 @@ func TestCreateFromEmptyConfig(t *testing.T) {
 	var policy schedulerapi.Policy
 
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 
 	configData = []byte(`{}`)
 	if err := runtime.DecodeInto(latestschedulerapi.Codec, configData, &policy); err != nil {
@@ -155,7 +163,9 @@ func TestCreateFromEmptyConfig(t *testing.T) {
 // The predicate/priority from DefaultProvider will be used.
 func TestCreateFromConfigWithUnspecifiedPredicatesOrPriorities(t *testing.T) {
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 
 	RegisterFitPredicate("PredicateOne", PredicateOne)
 	RegisterPriorityFunction("PriorityOne", PriorityOne, 1)
@@ -188,7 +198,9 @@ func TestCreateFromConfigWithUnspecifiedPredicatesOrPriorities(t *testing.T) {
 // Empty predicate/priority sets will be used.
 func TestCreateFromConfigWithEmptyPredicatesOrPriorities(t *testing.T) {
 	client := fake.NewSimpleClientset()
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 
 	RegisterFitPredicate("PredicateOne", PredicateOne)
 	RegisterPriorityFunction("PriorityOne", PriorityOne, 1)
@@ -240,7 +252,9 @@ func TestDefaultErrorFunc(t *testing.T) {
 		Spec:       apitesting.V1DeepEqualSafePodSpec(),
 	}
 	client := fake.NewSimpleClientset(&v1.PodList{Items: []v1.Pod{*testPod}})
-	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+	factory := newConfigFactory(client, v1.DefaultHardPodAffinitySymmetricWeight, stopCh)
 	queue := &internalqueue.FIFO{FIFO: cache.NewFIFO(cache.MetaNamespaceKeyFunc)}
 	podBackoff := util.CreatePodBackoff(1*time.Millisecond, 1*time.Second)
 	errFunc := factory.MakeDefaultErrorFunc(podBackoff, queue)
@@ -370,7 +384,9 @@ func testBind(binding *v1.Binding, t *testing.T) {
 func TestInvalidHardPodAffinitySymmetricWeight(t *testing.T) {
 	client := fake.NewSimpleClientset()
 	// factory of "default-scheduler"
-	factory := newConfigFactory(client, -1)
+	stopCh := make(chan struct{})
+	factory := newConfigFactory(client, -1, stopCh)
+	defer close(stopCh)
 	_, err := factory.Create()
 	if err == nil {
 		t.Errorf("expected err: invalid hardPodAffinitySymmetricWeight, got nothing")
@@ -399,7 +415,9 @@ func TestInvalidFactoryArgs(t *testing.T) {
 
 	for _, test := range testCases {
 		t.Run(test.name, func(t *testing.T) {
-			factory := newConfigFactory(client, test.hardPodAffinitySymmetricWeight)
+			stopCh := make(chan struct{})
+			factory := newConfigFactory(client, test.hardPodAffinitySymmetricWeight, stopCh)
+			defer close(stopCh)
 			_, err := factory.Create()
 			if err == nil {
 				t.Errorf("expected err: %s, got nothing", test.expectErr)
@@ -501,7 +519,7 @@ func TestSkipPodUpdate(t *testing.T) {
 	}
 }
 
-func newConfigFactory(client clientset.Interface, hardPodAffinitySymmetricWeight int32) Configurator {
+func newConfigFactory(client clientset.Interface, hardPodAffinitySymmetricWeight int32, stopCh <-chan struct{}) Configurator {
 	informerFactory := informers.NewSharedInformerFactory(client, 0)
 	return NewConfigFactory(&ConfigFactoryArgs{
 		v1.DefaultSchedulerName,
@@ -521,6 +539,7 @@ func newConfigFactory(client clientset.Interface, hardPodAffinitySymmetricWeight
 		disablePodPreemption,
 		schedulerapi.DefaultPercentageOfNodesToScore,
 		bindTimeoutSeconds,
+		stopCh,
 	})
 }
 

pkg/scheduler/scheduler.go

@@ -59,12 +59,6 @@ type Scheduler struct {
 	config *factory.Config
 }
 
-// StopEverything closes the scheduler config's StopEverything channel, to shut
-// down the Scheduler.
-func (sched *Scheduler) StopEverything() {
-	close(sched.config.StopEverything)
-}
-
 // Cache returns the cache in scheduler for test to check the data in scheduler.
 func (sched *Scheduler) Cache() schedulerinternalcache.Cache {
 	return sched.config.SchedulerCache
@@ -147,6 +141,7 @@ func New(client clientset.Interface,
 	storageClassInformer storageinformers.StorageClassInformer,
 	recorder record.EventRecorder,
 	schedulerAlgorithmSource kubeschedulerconfig.SchedulerAlgorithmSource,
+	stopCh <-chan struct{},
 	opts ...func(o *schedulerOptions)) (*Scheduler, error) {
 
 	options := defaultSchedulerOptions
@@ -230,6 +225,7 @@ func New(client clientset.Interface,
 	// Additional tweaks to the config produced by the configurator.
 	config.Recorder = recorder
 	config.DisablePreemption = options.disablePreemption
+	config.StopEverything = stopCh
 	// Create the scheduler.
 	sched := NewFromConfig(config)
 	return sched, nil

pkg/scheduler/scheduler_test.go

@@ -175,6 +175,8 @@ func TestSchedulerCreation(t *testing.T) {
 	factory.RegisterPriorityFunction("PriorityOne", PriorityOne, 1)
 	factory.RegisterAlgorithmProvider(testSource, sets.NewString("PredicateOne"), sets.NewString("PriorityOne"))
 
+	stopCh := make(chan struct{})
+	defer close(stopCh)
 	_, err := New(client,
 		informerFactory.Core().V1().Nodes(),
 		factory.NewPodInformer(client, 0),
@@ -188,6 +190,7 @@ func TestSchedulerCreation(t *testing.T) {
 		informerFactory.Storage().V1().StorageClasses(),
 		eventBroadcaster.NewRecorder(legacyscheme.Scheme, v1.EventSource{Component: "scheduler"}),
 		kubeschedulerconfig.SchedulerAlgorithmSource{Provider: &testSource},
+		stopCh,
 		WithBindTimeoutSeconds(defaultBindTimeout))
 
 	if err != nil {

test/integration/scheduler/extender_test.go

@@ -349,7 +349,7 @@ func TestSchedulerExtender(t *testing.T) {
 	}
 	policy.APIVersion = "v1"
 
-	context = initTestScheduler(t, context, nil, false, &policy)
+	context = initTestScheduler(t, context, false, &policy)
 	defer cleanupTest(t, context)
 
 	DoTestPodScheduling(context.ns, t, clientSet)

test/integration/scheduler/scheduler_test.go

@@ -522,7 +522,10 @@ func TestMultiScheduler(t *testing.T) {
 	informerFactory2 := informers.NewSharedInformerFactory(context.clientSet, 0)
 	podInformer2 := factory.NewPodInformer(context.clientSet, 0)
 
-	schedulerConfigFactory2 := createConfiguratorWithPodInformer(fooScheduler, clientSet2, podInformer2, informerFactory2)
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+
+	schedulerConfigFactory2 := createConfiguratorWithPodInformer(fooScheduler, clientSet2, podInformer2, informerFactory2, stopCh)
 	schedulerConfig2, err := schedulerConfigFactory2.Create()
 	if err != nil {
 		t.Errorf("Couldn't create scheduler config: %v", err)
@@ -530,12 +533,11 @@ func TestMultiScheduler(t *testing.T) {
 	eventBroadcaster2 := record.NewBroadcaster()
 	schedulerConfig2.Recorder = eventBroadcaster2.NewRecorder(legacyscheme.Scheme, v1.EventSource{Component: fooScheduler})
 	eventBroadcaster2.StartRecordingToSink(&clientv1core.EventSinkImpl{Interface: clientSet2.CoreV1().Events("")})
-	go podInformer2.Informer().Run(schedulerConfig2.StopEverything)
-	informerFactory2.Start(schedulerConfig2.StopEverything)
+	go podInformer2.Informer().Run(stopCh)
+	informerFactory2.Start(stopCh)
 
 	sched2, _ := scheduler.NewFromConfigurator(&scheduler.FakeConfigurator{Config: schedulerConfig2}, nil...)
 	sched2.Run()
-	defer close(schedulerConfig2.StopEverything)
 
 	//	6. **check point-2**:
 	//		- testPodWithAnnotationFitsFoo should be scheduled

test/integration/scheduler/taint_test.go

@@ -85,13 +85,10 @@ func TestTaintNodeByCondition(t *testing.T) {
 	admission.SetExternalKubeClientSet(externalClientset)
 	admission.SetExternalKubeInformerFactory(externalInformers)
 
-	controllerCh := make(chan struct{})
-	defer close(controllerCh)
-
 	// Apply feature gates to enable TaintNodesByCondition
 	algorithmprovider.ApplyFeatureGates()
 
-	context = initTestScheduler(t, context, controllerCh, false, nil)
+	context = initTestScheduler(t, context, false, nil)
 	cs := context.clientSet
 	informers := context.informerFactory
 	nsName := context.ns.Name
@@ -120,13 +117,13 @@ func TestTaintNodeByCondition(t *testing.T) {
 		t.Errorf("Failed to create node controller: %v", err)
 		return
 	}
-	go nc.Run(controllerCh)
+	go nc.Run(context.stopCh)
 
 	// Waiting for all controller sync.
-	externalInformers.Start(controllerCh)
-	externalInformers.WaitForCacheSync(controllerCh)
-	informers.Start(controllerCh)
-	informers.WaitForCacheSync(controllerCh)
+	externalInformers.Start(context.stopCh)
+	externalInformers.WaitForCacheSync(context.stopCh)
+	informers.Start(context.stopCh)
+	informers.WaitForCacheSync(context.stopCh)
 
 	// -------------------------------------------
 	// Test TaintNodeByCondition feature.

test/integration/scheduler/util.go

@@ -65,6 +65,7 @@ type TestContext struct {
 	schedulerConfigFactory factory.Configurator
 	schedulerConfig        *factory.Config
 	scheduler              *scheduler.Scheduler
+	stopCh                 chan struct{}
 }
 
 // createConfiguratorWithPodInformer creates a configurator for scheduler.
@@ -73,6 +74,7 @@ func createConfiguratorWithPodInformer(
 	clientSet clientset.Interface,
 	podInformer coreinformers.PodInformer,
 	informerFactory informers.SharedInformerFactory,
+	stopCh <-chan struct{},
 ) factory.Configurator {
 	return factory.NewConfigFactory(&factory.ConfigFactoryArgs{
 		SchedulerName:                  schedulerName,
@@ -92,13 +94,16 @@ func createConfiguratorWithPodInformer(
 		DisablePreemption:              false,
 		PercentageOfNodesToScore:       schedulerapi.DefaultPercentageOfNodesToScore,
 		BindTimeoutSeconds:             600,
+		StopCh:                         stopCh,
 	})
 }
 
 // initTestMasterAndScheduler initializes a test environment and creates a master with default
 // configuration.
 func initTestMaster(t *testing.T, nsPrefix string, admission admission.Interface) *TestContext {
-	var context TestContext
+	context := TestContext{
+		stopCh: make(chan struct{}),
+	}
 
 	// 1. Create master
 	h := &framework.MasterHolder{Initialized: make(chan struct{})}
@@ -138,13 +143,12 @@ func initTestMaster(t *testing.T, nsPrefix string, admission admission.Interface
 func initTestScheduler(
 	t *testing.T,
 	context *TestContext,
-	controllerCh chan struct{},
 	setPodInformer bool,
 	policy *schedulerapi.Policy,
 ) *TestContext {
 	// Pod preemption is enabled by default scheduler configuration, but preemption only happens when PodPriority
 	// feature gate is enabled at the same time.
-	return initTestSchedulerWithOptions(t, context, controllerCh, setPodInformer, policy, false, false, time.Second)
+	return initTestSchedulerWithOptions(t, context, setPodInformer, policy, false, false, time.Second)
 }
 
 // initTestSchedulerWithOptions initializes a test environment and creates a scheduler with default
@@ -152,7 +156,6 @@ func initTestScheduler(
 func initTestSchedulerWithOptions(
 	t *testing.T,
 	context *TestContext,
-	controllerCh chan struct{},
 	setPodInformer bool,
 	policy *schedulerapi.Policy,
 	disablePreemption bool,
@@ -179,7 +182,7 @@ func initTestSchedulerWithOptions(
 	}
 
 	context.schedulerConfigFactory = createConfiguratorWithPodInformer(
-		v1.DefaultSchedulerName, context.clientSet, podInformer, context.informerFactory)
+		v1.DefaultSchedulerName, context.clientSet, podInformer, context.informerFactory, context.stopCh)
 
 	var err error
 
@@ -193,11 +196,6 @@ func initTestSchedulerWithOptions(
 		t.Fatalf("Couldn't create scheduler config: %v", err)
 	}
 
-	// set controllerCh if provided.
-	if controllerCh != nil {
-		context.schedulerConfig.StopEverything = controllerCh
-	}
-
 	// set DisablePreemption option
 	context.schedulerConfig.DisablePreemption = disablePreemption
 
@@ -252,21 +250,21 @@ func initDisruptionController(context *TestContext) *disruption.DisruptionContro
 // initTest initializes a test environment and creates master and scheduler with default
 // configuration.
 func initTest(t *testing.T, nsPrefix string) *TestContext {
-	return initTestScheduler(t, initTestMaster(t, nsPrefix, nil), nil, true, nil)
+	return initTestScheduler(t, initTestMaster(t, nsPrefix, nil), true, nil)
 }
 
 // initTestDisablePreemption initializes a test environment and creates master and scheduler with default
 // configuration but with pod preemption disabled.
 func initTestDisablePreemption(t *testing.T, nsPrefix string) *TestContext {
 	return initTestSchedulerWithOptions(
-		t, initTestMaster(t, nsPrefix, nil), nil, true, nil, true, false, time.Second)
+		t, initTestMaster(t, nsPrefix, nil), true, nil, true, false, time.Second)
 }
 
 // cleanupTest deletes the scheduler and the test namespace. It should be called
 // at the end of a test.
 func cleanupTest(t *testing.T, context *TestContext) {
 	// Kill the scheduler.
-	close(context.schedulerConfig.StopEverything)
+	close(context.stopCh)
 	// Cleanup nodes.
 	context.clientSet.CoreV1().Nodes().DeleteCollection(nil, metav1.ListOptions{})
 	framework.DeleteTestingNamespace(context.ns, context.httpServer, t)

test/integration/scheduler/volume_binding_test.go

@@ -901,9 +901,7 @@ func setupCluster(t *testing.T, nsName string, numberOfNodes int, features map[s
 	// Set feature gates
 	utilfeature.DefaultFeatureGate.SetFromMap(features)
 
-	controllerCh := make(chan struct{})
-
-	context := initTestSchedulerWithOptions(t, initTestMaster(t, nsName, nil), controllerCh, false, nil, false, disableEquivalenceCache, resyncPeriod)
+	context := initTestSchedulerWithOptions(t, initTestMaster(t, nsName, nil), false, nil, false, disableEquivalenceCache, resyncPeriod)
 
 	clientset := context.clientSet
 	ns := context.ns.Name
@@ -912,10 +910,10 @@ func setupCluster(t *testing.T, nsName string, numberOfNodes int, features map[s
 	if err != nil {
 		t.Fatalf("Failed to create PV controller: %v", err)
 	}
-	go ctrl.Run(controllerCh)
+	go ctrl.Run(context.stopCh)
 	// Start informer factory after all controllers are configured and running.
-	informerFactory.Start(controllerCh)
-	informerFactory.WaitForCacheSync(controllerCh)
+	informerFactory.Start(context.stopCh)
+	informerFactory.WaitForCacheSync(context.stopCh)
 
 	// Create shared objects
 	// Create nodes
@@ -936,7 +934,7 @@ func setupCluster(t *testing.T, nsName string, numberOfNodes int, features map[s
 	return &testConfig{
 		client: clientset,
 		ns:     ns,
-		stop:   controllerCh,
+		stop:   context.stopCh,
 		teardown: func() {
 			deleteTestObjects(clientset, ns, nil)
 			cleanupTest(t, context)

test/integration/util/util.go

@@ -66,7 +66,8 @@ func StartScheduler(clientSet clientset.Interface) (factory.Configurator, Shutdo
 	evtWatch := evtBroadcaster.StartRecordingToSink(&clientv1core.EventSinkImpl{
 		Interface: clientSet.CoreV1().Events("")})
 
-	schedulerConfigurator := createSchedulerConfigurator(clientSet, informerFactory)
+	stopCh := make(chan struct{})
+	schedulerConfigurator := createSchedulerConfigurator(clientSet, informerFactory, stopCh)
 
 	sched, err := scheduler.NewFromConfigurator(schedulerConfigurator, func(conf *factory.Config) {
 		conf.Recorder = evtBroadcaster.NewRecorder(legacyscheme.Scheme, v1.EventSource{Component: "scheduler"})
@@ -75,16 +76,13 @@ func StartScheduler(clientSet clientset.Interface) (factory.Configurator, Shutdo
 		glog.Fatalf("Error creating scheduler: %v", err)
 	}
 
-	stop := make(chan struct{})
-	informerFactory.Start(stop)
-
+	informerFactory.Start(stopCh)
 	sched.Run()
 
 	shutdownFunc := func() {
 		glog.Infof("destroying scheduler")
 		evtWatch.Stop()
-		sched.StopEverything()
-		close(stop)
+		close(stopCh)
 		glog.Infof("destroyed scheduler")
 	}
 	return schedulerConfigurator, shutdownFunc
@@ -94,6 +92,7 @@ func StartScheduler(clientSet clientset.Interface) (factory.Configurator, Shutdo
 func createSchedulerConfigurator(
 	clientSet clientset.Interface,
 	informerFactory informers.SharedInformerFactory,
+	stopCh <-chan struct{},
 ) factory.Configurator {
 	// Enable EnableEquivalenceClassCache for all integration tests.
 	utilfeature.DefaultFeatureGate.Set("EnableEquivalenceClassCache=true")
@@ -115,5 +114,6 @@ func createSchedulerConfigurator(
 		EnableEquivalenceClassCache:    utilfeature.DefaultFeatureGate.Enabled(features.EnableEquivalenceClassCache),
 		DisablePreemption:              false,
 		PercentageOfNodesToScore:       schedulerapi.DefaultPercentageOfNodesToScore,
+		StopCh:                         stopCh,
 	})
 }