Merge pull request #29184 from wojtek-t/rs_controller_ref

Automatic merge from submit-queue

ReplicaSet controller can set/remove ControllerRef

This is mostly a copy from https://github.com/kubernetes/kubernetes/pull/27600

cmd/kube-controller-manager/app/controllermanager.go

@@ -364,7 +364,7 @@ func StartControllers(s *options.CMServer, kubeClient *client.Client, kubeconfig
 
 		if containsResource(resources, "replicasets") {
 			glog.Infof("Starting ReplicaSet controller")
-			go replicaset.NewReplicaSetController(podInformer, clientset.NewForConfigOrDie(restclient.AddUserAgent(kubeconfig, "replicaset-controller")), ResyncPeriod(s), replicaset.BurstReplicas, int(s.LookupCacheSizeForRS)).
+			go replicaset.NewReplicaSetController(podInformer, clientset.NewForConfigOrDie(restclient.AddUserAgent(kubeconfig, "replicaset-controller")), ResyncPeriod(s), replicaset.BurstReplicas, int(s.LookupCacheSizeForRS), s.EnableGarbageCollector).
 				Run(int(s.ConcurrentRSSyncs), wait.NeverStop)
 			time.Sleep(wait.Jitter(s.ControllerStartInterval.Duration, ControllerStartJitter))
 		}

pkg/controller/replicaset/replica_set.go

@@ -27,8 +27,10 @@ import (
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/apis/extensions"
+	"k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
 	"k8s.io/kubernetes/pkg/client/cache"
 	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 	unversionedcore "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/unversioned"
@@ -38,6 +40,7 @@ import (
 	"k8s.io/kubernetes/pkg/controller/framework/informers"
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/runtime"
+	utilerrors "k8s.io/kubernetes/pkg/util/errors"
 	"k8s.io/kubernetes/pkg/util/metrics"
 	utilruntime "k8s.io/kubernetes/pkg/util/runtime"
 	"k8s.io/kubernetes/pkg/util/wait"
@@ -63,6 +66,10 @@ const (
 	statusUpdateRetries = 1
 )
 
+func getRSKind() unversioned.GroupVersionKind {
+	return v1beta1.SchemeGroupVersion.WithKind("ReplicaSet")
+}
+
 // ReplicaSetController is responsible for synchronizing ReplicaSet objects stored
 // in the system with actual running pods.
 type ReplicaSetController struct {
@@ -101,21 +108,25 @@ type ReplicaSetController struct {
 
 	// Controllers that need to be synced
 	queue *workqueue.Type
+
+	// garbageCollectorEnabled denotes if the garbage collector is enabled. RC
+	// manager behaves differently if GC is enabled.
+	garbageCollectorEnabled bool
 }
 
 // NewReplicaSetController creates a new ReplicaSetController.
-func NewReplicaSetController(podInformer framework.SharedIndexInformer, kubeClient clientset.Interface, resyncPeriod controller.ResyncPeriodFunc, burstReplicas int, lookupCacheSize int) *ReplicaSetController {
+func NewReplicaSetController(podInformer framework.SharedIndexInformer, kubeClient clientset.Interface, resyncPeriod controller.ResyncPeriodFunc, burstReplicas int, lookupCacheSize int, garbageCollectorEnabled bool) *ReplicaSetController {
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartLogging(glog.Infof)
 	eventBroadcaster.StartRecordingToSink(&unversionedcore.EventSinkImpl{Interface: kubeClient.Core().Events("")})
 
 	return newReplicaSetController(
 		eventBroadcaster.NewRecorder(api.EventSource{Component: "replicaset-controller"}),
-		podInformer, kubeClient, resyncPeriod, burstReplicas, lookupCacheSize)
+		podInformer, kubeClient, resyncPeriod, burstReplicas, lookupCacheSize, garbageCollectorEnabled)
 }
 
 // newReplicaSetController configures a replica set controller with the specified event recorder
-func newReplicaSetController(eventRecorder record.EventRecorder, podInformer framework.SharedIndexInformer, kubeClient clientset.Interface, resyncPeriod controller.ResyncPeriodFunc, burstReplicas int, lookupCacheSize int) *ReplicaSetController {
+func newReplicaSetController(eventRecorder record.EventRecorder, podInformer framework.SharedIndexInformer, kubeClient clientset.Interface, resyncPeriod controller.ResyncPeriodFunc, burstReplicas int, lookupCacheSize int, garbageCollectorEnabled bool) *ReplicaSetController {
 	if kubeClient != nil && kubeClient.Core().GetRESTClient().GetRateLimiter() != nil {
 		metrics.RegisterMetricAndTrackRateLimiterUsage("replicaset_controller", kubeClient.Core().GetRESTClient().GetRateLimiter())
 	}
@@ -129,6 +140,7 @@ func newReplicaSetController(eventRecorder record.EventRecorder, podInformer fra
 		burstReplicas: burstReplicas,
 		expectations:  controller.NewUIDTrackingControllerExpectations(controller.NewControllerExpectations()),
 		queue:         workqueue.New(),
+		garbageCollectorEnabled: garbageCollectorEnabled,
 	}
 
 	rsc.rsStore.Store, rsc.rsController = framework.NewInformer(
@@ -144,43 +156,8 @@ func newReplicaSetController(eventRecorder record.EventRecorder, podInformer fra
 		// TODO: Can we have much longer period here?
 		FullControllerResyncPeriod,
 		framework.ResourceEventHandlerFuncs{
-			AddFunc: rsc.enqueueReplicaSet,
+			AddFunc:    rsc.enqueueReplicaSet,
-			UpdateFunc: func(old, cur interface{}) {
+			UpdateFunc: rsc.updateRS,
-				oldRS := old.(*extensions.ReplicaSet)
-				curRS := cur.(*extensions.ReplicaSet)
-
-				// We should invalidate the whole lookup cache if a RS's selector has been updated.
-				//
-				// Imagine that you have two RSs:
-				// * old RS1
-				// * new RS2
-				// You also have a pod that is attached to RS2 (because it doesn't match RS1 selector).
-				// Now imagine that you are changing RS1 selector so that it is now matching that pod,
-				// in such case we must invalidate the whole cache so that pod could be adopted by RS1
-				//
-				// This makes the lookup cache less helpful, but selector update does not happen often,
-				// so it's not a big problem
-				if !reflect.DeepEqual(oldRS.Spec.Selector, curRS.Spec.Selector) {
-					rsc.lookupCache.InvalidateAll()
-				}
-
-				// You might imagine that we only really need to enqueue the
-				// replica set when Spec changes, but it is safer to sync any
-				// time this function is triggered. That way a full informer
-				// resync can requeue any replica set that don't yet have pods
-				// but whose last attempts at creating a pod have failed (since
-				// we don't block on creation of pods) instead of those
-				// replica sets stalling indefinitely. Enqueueing every time
-				// does result in some spurious syncs (like when Status.Replica
-				// is updated and the watch notification from it retriggers
-				// this function), but in general extra resyncs shouldn't be
-				// that bad as ReplicaSets that haven't met expectations yet won't
-				// sync, and all the listing is done using local stores.
-				if oldRS.Status.Replicas != curRS.Status.Replicas {
-					glog.V(4).Infof("Observed updated replica count for ReplicaSet: %v, %d->%d", curRS.Name, oldRS.Status.Replicas, curRS.Status.Replicas)
-				}
-				rsc.enqueueReplicaSet(cur)
-			},
 			// This will enter the sync loop and no-op, because the replica set has been deleted from the store.
 			// Note that deleting a replica set immediately after scaling it to 0 will not work. The recommended
 			// way of achieving this is by performing a `stop` operation on the replica set.
@@ -208,7 +185,8 @@ func newReplicaSetController(eventRecorder record.EventRecorder, podInformer fra
 // NewReplicationManagerFromClient creates a new ReplicationManager that runs its own informer.
 func NewReplicaSetControllerFromClient(kubeClient clientset.Interface, resyncPeriod controller.ResyncPeriodFunc, burstReplicas int, lookupCacheSize int) *ReplicaSetController {
 	podInformer := informers.CreateSharedPodIndexInformer(kubeClient, resyncPeriod())
-	rsc := NewReplicaSetController(podInformer, kubeClient, resyncPeriod, burstReplicas, lookupCacheSize)
+	garbageCollectorEnabled := false
+	rsc := NewReplicaSetController(podInformer, kubeClient, resyncPeriod, burstReplicas, lookupCacheSize, garbageCollectorEnabled)
 	rsc.internalPodInformer = podInformer
 	return rsc
 }
@@ -239,13 +217,14 @@ func (rsc *ReplicaSetController) Run(workers int, stopCh <-chan struct{}) {
 
 // getPodReplicaSet returns the replica set managing the given pod.
 // TODO: Surface that we are ignoring multiple replica sets for a single pod.
+// TODO: use ownerReference.Controller to determine if the rs controls the pod.
 func (rsc *ReplicaSetController) getPodReplicaSet(pod *api.Pod) *extensions.ReplicaSet {
 	// look up in the cache, if cached and the cache is valid, just return cached value
 	if obj, cached := rsc.lookupCache.GetMatchingObject(pod); cached {
 		rs, ok := obj.(*extensions.ReplicaSet)
 		if !ok {
 			// This should not happen
-			glog.Errorf("lookup cache does not retuen a ReplicaSet object")
+			glog.Errorf("lookup cache does not return a ReplicaSet object")
 			return nil
 		}
 		if cached && rsc.isCacheValid(pod, rs) {
@@ -278,6 +257,44 @@ func (rsc *ReplicaSetController) getPodReplicaSet(pod *api.Pod) *extensions.Repl
 	return &rss[0]
 }
 
+// callback when RS is updated
+func (rsc *ReplicaSetController) updateRS(old, cur interface{}) {
+	oldRS := old.(*extensions.ReplicaSet)
+	curRS := cur.(*extensions.ReplicaSet)
+
+	// We should invalidate the whole lookup cache if a RS's selector has been updated.
+	//
+	// Imagine that you have two RSs:
+	// * old RS1
+	// * new RS2
+	// You also have a pod that is attached to RS2 (because it doesn't match RS1 selector).
+	// Now imagine that you are changing RS1 selector so that it is now matching that pod,
+	// in such case we must invalidate the whole cache so that pod could be adopted by RS1
+	//
+	// This makes the lookup cache less helpful, but selector update does not happen often,
+	// so it's not a big problem
+	if !reflect.DeepEqual(oldRS.Spec.Selector, curRS.Spec.Selector) {
+		rsc.lookupCache.InvalidateAll()
+	}
+
+	// You might imagine that we only really need to enqueue the
+	// replica set when Spec changes, but it is safer to sync any
+	// time this function is triggered. That way a full informer
+	// resync can requeue any replica set that don't yet have pods
+	// but whose last attempts at creating a pod have failed (since
+	// we don't block on creation of pods) instead of those
+	// replica sets stalling indefinitely. Enqueueing every time
+	// does result in some spurious syncs (like when Status.Replica
+	// is updated and the watch notification from it retriggers
+	// this function), but in general extra resyncs shouldn't be
+	// that bad as ReplicaSets that haven't met expectations yet won't
+	// sync, and all the listing is done using local stores.
+	if oldRS.Status.Replicas != curRS.Status.Replicas {
+		glog.V(4).Infof("Observed updated replica count for ReplicaSet: %v, %d->%d", curRS.Name, oldRS.Status.Replicas, curRS.Status.Replicas)
+	}
+	rsc.enqueueReplicaSet(cur)
+}
+
 // isCacheValid check if the cache is valid
 func (rsc *ReplicaSetController) isCacheValid(pod *api.Pod, cachedRS *extensions.ReplicaSet) bool {
 	_, exists, err := rsc.rsStore.Get(cachedRS)
@@ -357,9 +374,7 @@ func (rsc *ReplicaSetController) updatePod(old, cur interface{}) {
 		return
 	}
 
-	if rs := rsc.getPodReplicaSet(curPod); rs != nil {
+	// Enqueue the oldRC before the curRC to give curRC a chance to adopt the oldPod.
-		rsc.enqueueReplicaSet(rs)
-	}
 	if labelChanged {
 		// If the old and new ReplicaSet are the same, the first one that syncs
 		// will set expectations preventing any damage from the second.
@@ -367,6 +382,10 @@ func (rsc *ReplicaSetController) updatePod(old, cur interface{}) {
 			rsc.enqueueReplicaSet(oldRS)
 		}
 	}
+
+	if curRS := rsc.getPodReplicaSet(curPod); curRS != nil {
+		rsc.enqueueReplicaSet(curRS)
+	}
 }
 
 // When a pod is deleted, enqueue the replica set that manages the pod and update its expectations.
@@ -456,13 +475,28 @@ func (rsc *ReplicaSetController) manageReplicas(filteredPods []*api.Pod, rs *ext
 		// into a performance bottleneck. We should generate a UID for the pod
 		// beforehand and store it via ExpectCreations.
 		rsc.expectations.ExpectCreations(rsKey, diff)
-		wait := sync.WaitGroup{}
+		var wg sync.WaitGroup
-		wait.Add(diff)
+		wg.Add(diff)
 		glog.V(2).Infof("Too few %q/%q replicas, need %d, creating %d", rs.Namespace, rs.Name, rs.Spec.Replicas, diff)
 		for i := 0; i < diff; i++ {
 			go func() {
-				defer wait.Done()
+				defer wg.Done()
-				if err := rsc.podControl.CreatePods(rs.Namespace, &rs.Spec.Template, rs); err != nil {
+				var err error
+
+				if rsc.garbageCollectorEnabled {
+					var trueVar = true
+					controllerRef := &api.OwnerReference{
+						APIVersion: getRSKind().GroupVersion().String(),
+						Kind:       getRSKind().Kind,
+						Name:       rs.Name,
+						UID:        rs.UID,
+						Controller: &trueVar,
+					}
+					err = rsc.podControl.CreatePodsWithControllerRef(rs.Namespace, &rs.Spec.Template, rs, controllerRef)
+				} else {
+					err = rsc.podControl.CreatePods(rs.Namespace, &rs.Spec.Template, rs)
+				}
+				if err != nil {
 					// Decrement the expected number of creates because the informer won't observe this pod
 					glog.V(2).Infof("Failed creation, decrementing expectations for replica set %q/%q", rs.Namespace, rs.Name)
 					rsc.expectations.CreationObserved(rsKey)
@@ -470,7 +504,7 @@ func (rsc *ReplicaSetController) manageReplicas(filteredPods []*api.Pod, rs *ext
 				}
 			}()
 		}
-		wait.Wait()
+		wg.Wait()
 	} else if diff > 0 {
 		if diff > rsc.burstReplicas {
 			diff = rsc.burstReplicas
@@ -494,11 +528,11 @@ func (rsc *ReplicaSetController) manageReplicas(filteredPods []*api.Pod, rs *ext
 			deletedPodKeys = append(deletedPodKeys, controller.PodKey(filteredPods[i]))
 		}
 		rsc.expectations.ExpectDeletions(rsKey, deletedPodKeys)
-		wait := sync.WaitGroup{}
+		var wg sync.WaitGroup
-		wait.Add(diff)
+		wg.Add(diff)
 		for i := 0; i < diff; i++ {
 			go func(ix int) {
-				defer wait.Done()
+				defer wg.Done()
 				if err := rsc.podControl.DeletePod(rs.Namespace, filteredPods[ix].Name, rs); err != nil {
 					// Decrement the expected number of deletes because the informer won't observe this deletion
 					podKey := controller.PodKey(filteredPods[ix])
@@ -508,7 +542,7 @@ func (rsc *ReplicaSetController) manageReplicas(filteredPods []*api.Pod, rs *ext
 				}
 			}(i)
 		}
-		wait.Wait()
+		wg.Wait()
 	}
 }
 
@@ -557,16 +591,60 @@ func (rsc *ReplicaSetController) syncReplicaSet(key string) error {
 		glog.Errorf("Error converting pod selector to selector: %v", err)
 		return err
 	}
-	podList, err := rsc.podStore.Pods(rs.Namespace).List(selector)
+
-	if err != nil {
+	// TODO: Do the List and Filter in a single pass, or use an index.
-		glog.Errorf("Error getting pods for ReplicaSet %q: %v", key, err)
+	var filteredPods []*api.Pod
-		rsc.queue.Add(key)
+	if rsc.garbageCollectorEnabled {
-		return err
+		// list all pods to include the pods that don't match the rs`s selector
+		// anymore but has the stale controller ref.
+		podList, err := rsc.podStore.Pods(rs.Namespace).List(labels.Everything())
+		if err != nil {
+			glog.Errorf("Error getting pods for rs %q: %v", key, err)
+			rsc.queue.Add(key)
+			return err
+		}
+		cm := controller.NewPodControllerRefManager(rsc.podControl, rs.ObjectMeta, selector, getRSKind())
+		matchesAndControlled, matchesNeedsController, controlledDoesNotMatch := cm.Classify(podList.Items)
+		for _, pod := range matchesNeedsController {
+			err := cm.AdoptPod(pod)
+			// continue to next pod if adoption fails.
+			if err != nil {
+				// If the pod no longer exists, don't even log the error.
+				if !errors.IsNotFound(err) {
+					utilruntime.HandleError(err)
+				}
+			} else {
+				matchesAndControlled = append(matchesAndControlled, pod)
+			}
+		}
+		filteredPods = matchesAndControlled
+		// remove the controllerRef for the pods that no longer have matching labels
+		var errlist []error
+		for _, pod := range controlledDoesNotMatch {
+			err := cm.ReleasePod(pod)
+			if err != nil {
+				errlist = append(errlist, err)
+			}
+		}
+		if len(errlist) != 0 {
+			aggregate := utilerrors.NewAggregate(errlist)
+			// push the RS into work queue again. We need to try to free the
+			// pods again otherwise they will stuck with the stale
+			// controllerRef.
+			rsc.queue.Add(key)
+			return aggregate
+		}
+	} else {
+		podList, err := rsc.podStore.Pods(rs.Namespace).List(selector)
+		if err != nil {
+			glog.Errorf("Error getting pods for rs %q: %v", key, err)
+			rsc.queue.Add(key)
+			return err
+		}
+		filteredPods = controller.FilterActivePods(podList.Items)
 	}
 
-	// TODO: Do this in a single pass, or use an index.
+	if rsNeedsSync && rs.DeletionTimestamp == nil {
-	filteredPods := controller.FilterActivePods(podList.Items)
-	if rsNeedsSync {
 		rsc.manageReplicas(filteredPods, &rs)
 	}
 

pkg/controller/replicaset/replica_set_test.go

@@ -96,34 +96,46 @@ func newReplicaSet(replicas int, selectorMap map[string]string) *extensions.Repl
 	return rs
 }
 
+// create a pod with the given phase for the given rs (same selectors and namespace)
+func newPod(name string, rs *extensions.ReplicaSet, status api.PodPhase) *api.Pod {
+	return &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			Name:      name,
+			Namespace: rs.Namespace,
+			Labels:    rs.Spec.Selector.MatchLabels,
+		},
+		Status: api.PodStatus{Phase: status},
+	}
+}
+
 // create count pods with the given phase for the given ReplicaSet (same selectors and namespace), and add them to the store.
 func newPodList(store cache.Store, count int, status api.PodPhase, labelMap map[string]string, rs *extensions.ReplicaSet, name string) *api.PodList {
 	pods := []api.Pod{}
+	var trueVar = true
+	controllerReference := api.OwnerReference{UID: rs.UID, APIVersion: "v1beta1", Kind: "ReplicaSet", Name: rs.Name, Controller: &trueVar}
 	for i := 0; i < count; i++ {
-		newPod := api.Pod{
+		pod := newPod(fmt.Sprintf("%s%d", name, i), rs, status)
-			ObjectMeta: api.ObjectMeta{
+		pod.ObjectMeta.Labels = labelMap
-				Name:      fmt.Sprintf("%s%d", name, i),
+		pod.OwnerReferences = []api.OwnerReference{controllerReference}
-				Labels:    labelMap,
-				Namespace: rs.Namespace,
-			},
-			Status: api.PodStatus{Phase: status},
-		}
 		if store != nil {
-			store.Add(&newPod)
+			store.Add(pod)
 		}
-		pods = append(pods, newPod)
+		pods = append(pods, *pod)
 	}
 	return &api.PodList{
 		Items: pods,
 	}
 }
 
-func validateSyncReplicaSet(t *testing.T, fakePodControl *controller.FakePodControl, expectedCreates, expectedDeletes int) {
+func validateSyncReplicaSet(t *testing.T, fakePodControl *controller.FakePodControl, expectedCreates, expectedDeletes, expectedPatches int) {
-	if len(fakePodControl.Templates) != expectedCreates {
+	if e, a := expectedCreates, len(fakePodControl.Templates); e != a {
-		t.Errorf("Unexpected number of creates.  Expected %d, saw %d\n", expectedCreates, len(fakePodControl.Templates))
+		t.Errorf("Unexpected number of creates.  Expected %d, saw %d\n", e, a)
 	}
-	if len(fakePodControl.DeletePodName) != expectedDeletes {
+	if e, a := expectedDeletes, len(fakePodControl.DeletePodName); e != a {
-		t.Errorf("Unexpected number of deletes.  Expected %d, saw %d\n", expectedDeletes, len(fakePodControl.DeletePodName))
+		t.Errorf("Unexpected number of deletes.  Expected %d, saw %d\n", e, a)
+	}
+	if e, a := expectedPatches, len(fakePodControl.Patches); e != a {
+		t.Errorf("Unexpected number of patches.  Expected %d, saw %d\n", e, a)
 	}
 }
 
@@ -150,7 +162,7 @@ func TestSyncReplicaSetDoesNothing(t *testing.T) {
 
 	manager.podControl = &fakePodControl
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 }
 
 func TestSyncReplicaSetDeletes(t *testing.T) {
@@ -167,7 +179,7 @@ func TestSyncReplicaSetDeletes(t *testing.T) {
 	newPodList(manager.podStore.Indexer, 2, api.PodRunning, labelMap, rsSpec, "pod")
 
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 0, 1)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 1, 0)
 }
 
 func TestDeleteFinalStateUnknown(t *testing.T) {
@@ -217,7 +229,7 @@ func TestSyncReplicaSetCreates(t *testing.T) {
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
 	manager.syncReplicaSet(getKey(rs, t))
-	validateSyncReplicaSet(t, &fakePodControl, 2, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 2, 0, 0)
 }
 
 func TestStatusUpdatesWithoutReplicasChange(t *testing.T) {
@@ -244,7 +256,7 @@ func TestStatusUpdatesWithoutReplicasChange(t *testing.T) {
 	manager.podControl = &fakePodControl
 	manager.syncReplicaSet(getKey(rs, t))
 
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 	if fakeHandler.RequestReceived != nil {
 		t.Errorf("Unexpected update when pods and ReplicaSets are in a steady state")
 	}
@@ -304,7 +316,7 @@ func TestControllerUpdateReplicas(t *testing.T) {
 
 	decRc := runtime.EncodeOrDie(testapi.Extensions.Codec(), rs)
 	fakeHandler.ValidateRequest(t, testapi.Extensions.ResourcePath(replicaSetResourceName(), rs.Namespace, rs.Name)+"/status", "PUT", &decRc)
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 }
 
 func TestSyncReplicaSetDormancy(t *testing.T) {
@@ -330,13 +342,13 @@ func TestSyncReplicaSetDormancy(t *testing.T) {
 	// Creates a replica and sets expectations
 	rsSpec.Status.Replicas = 1
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 
 	// Expectations prevents replicas but not an update on status
 	rsSpec.Status.Replicas = 0
 	fakePodControl.Clear()
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 
 	// Get the key for the controller
 	rsKey, err := controller.KeyFunc(rsSpec)
@@ -352,13 +364,13 @@ func TestSyncReplicaSetDormancy(t *testing.T) {
 	fakePodControl.Err = fmt.Errorf("Fake Error")
 
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 
 	// This replica should not need a Lowering of expectations, since the previous create failed
 	fakePodControl.Clear()
 	fakePodControl.Err = nil
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 
 	// 1 PUT for the ReplicaSet status during dormancy window.
 	// Note that the pod creates go through pod control so they're not recorded.
@@ -716,7 +728,7 @@ func doTestControllerBurstReplicas(t *testing.T, burstReplicas, numReplicas int)
 					expectedPods = int32(burstReplicas)
 				}
 				// This validates the ReplicaSet manager sync actually created pods
-				validateSyncReplicaSet(t, &fakePodControl, int(expectedPods), 0)
+				validateSyncReplicaSet(t, &fakePodControl, int(expectedPods), 0, 0)
 
 				// This simulates the watch events for all but 1 of the expected pods.
 				// None of these should wake the controller because it has expectations==BurstReplicas.
@@ -727,7 +739,7 @@ func doTestControllerBurstReplicas(t *testing.T, burstReplicas, numReplicas int)
 
 				podExp, exists, err := manager.expectations.GetExpectations(rsKey)
 				if !exists || err != nil {
-					t.Fatalf("Did not find expectations for rc.")
+					t.Fatalf("Did not find expectations for rs.")
 				}
 				if add, _ := podExp.GetExpectations(); add != 1 {
 					t.Fatalf("Expectations are wrong %v", podExp)
@@ -737,7 +749,7 @@ func doTestControllerBurstReplicas(t *testing.T, burstReplicas, numReplicas int)
 				if expectedPods > int32(burstReplicas) {
 					expectedPods = int32(burstReplicas)
 				}
-				validateSyncReplicaSet(t, &fakePodControl, 0, int(expectedPods))
+				validateSyncReplicaSet(t, &fakePodControl, 0, int(expectedPods), 0)
 
 				// To accurately simulate a watch we must delete the exact pods
 				// the rs is waiting for.
@@ -772,7 +784,7 @@ func doTestControllerBurstReplicas(t *testing.T, burstReplicas, numReplicas int)
 			// Check that the ReplicaSet didn't take any action for all the above pods
 			fakePodControl.Clear()
 			manager.syncReplicaSet(getKey(rsSpec, t))
-			validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+			validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 
 			// Create/Delete the last pod
 			// The last add pod will decrease the expectation of the ReplicaSet to 0,
@@ -851,7 +863,7 @@ func TestRSSyncExpectations(t *testing.T) {
 		},
 	})
 	manager.syncReplicaSet(getKey(rsSpec, t))
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 }
 
 func TestDeleteControllerAndExpectations(t *testing.T) {
@@ -867,7 +879,7 @@ func TestDeleteControllerAndExpectations(t *testing.T) {
 
 	// This should set expectations for the ReplicaSet
 	manager.syncReplicaSet(getKey(rs, t))
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 	fakePodControl.Clear()
 
 	// Get the ReplicaSet key
@@ -893,7 +905,7 @@ func TestDeleteControllerAndExpectations(t *testing.T) {
 	podExp.Add(-1, 0)
 	manager.podStore.Indexer.Replace(make([]interface{}, 0), "0")
 	manager.syncReplicaSet(getKey(rs, t))
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 }
 
 func TestRSManagerNotReady(t *testing.T) {
@@ -911,7 +923,7 @@ func TestRSManagerNotReady(t *testing.T) {
 
 	rsKey := getKey(rsSpec, t)
 	manager.syncReplicaSet(rsKey)
-	validateSyncReplicaSet(t, &fakePodControl, 0, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 0, 0, 0)
 	queueRS, _ := manager.queue.Get()
 	if queueRS != rsKey {
 		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
@@ -919,7 +931,7 @@ func TestRSManagerNotReady(t *testing.T) {
 
 	manager.podStoreSynced = alwaysReady
 	manager.syncReplicaSet(rsKey)
-	validateSyncReplicaSet(t, &fakePodControl, 1, 0)
+	validateSyncReplicaSet(t, &fakePodControl, 1, 0, 0)
 }
 
 // shuffle returns a new shuffled list of container controllers.
@@ -984,9 +996,9 @@ func TestDeletionTimestamp(t *testing.T) {
 	// A pod added with a deletion timestamp should decrement deletions, not creations.
 	manager.addPod(&pod)
 
-	queueRC, _ := manager.queue.Get()
+	queueRS, _ := manager.queue.Get()
-	if queueRC != rsKey {
+	if queueRS != rsKey {
-		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRC)
+		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
 	}
 	manager.queue.Done(rsKey)
 
@@ -1001,9 +1013,9 @@ func TestDeletionTimestamp(t *testing.T) {
 	manager.expectations.ExpectDeletions(rsKey, []string{controller.PodKey(&pod)})
 	manager.updatePod(&oldPod, &pod)
 
-	queueRC, _ = manager.queue.Get()
+	queueRS, _ = manager.queue.Get()
-	if queueRC != rsKey {
+	if queueRS != rsKey {
-		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRC)
+		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
 	}
 	manager.queue.Done(rsKey)
 
@@ -1041,9 +1053,9 @@ func TestDeletionTimestamp(t *testing.T) {
 	// Deleting the second pod should clear expectations.
 	manager.deletePod(secondPod)
 
-	queueRC, _ = manager.queue.Get()
+	queueRS, _ = manager.queue.Get()
-	if queueRC != rsKey {
+	if queueRS != rsKey {
-		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRC)
+		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
 	}
 	manager.queue.Done(rsKey)
 
@@ -1052,3 +1064,202 @@ func TestDeletionTimestamp(t *testing.T) {
 		t.Fatalf("Wrong expectations %+v", podExp)
 	}
 }
+
+// setupManagerWithGCEnabled creates a RS manager with a fakePodControl
+// and with garbageCollectorEnabled set to true
+func setupManagerWithGCEnabled() (manager *ReplicaSetController, fakePodControl *controller.FakePodControl) {
+	c := clientset.NewForConfigOrDie(&restclient.Config{Host: "", ContentConfig: restclient.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
+	fakePodControl = &controller.FakePodControl{}
+	manager = NewReplicaSetControllerFromClient(c, controller.NoResyncPeriodFunc, BurstReplicas, 0)
+	manager.garbageCollectorEnabled = true
+	manager.podStoreSynced = alwaysReady
+	manager.podControl = fakePodControl
+	return manager, fakePodControl
+}
+
+func TestDoNotPatchPodWithOtherControlRef(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	var trueVar = true
+	otherControllerReference := api.OwnerReference{UID: util.NewUUID(), APIVersion: "v1beta1", Kind: "ReplicaSet", Name: "AnotherRS", Controller: &trueVar}
+	// add to podStore a matching Pod controlled by another controller. Expect no patch.
+	pod := newPod("pod", rs, api.PodRunning)
+	pod.OwnerReferences = []api.OwnerReference{otherControllerReference}
+	manager.podStore.Indexer.Add(pod)
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// because the matching pod already has a controller, so 2 pods should be created.
+	validateSyncReplicaSet(t, fakePodControl, 2, 0, 0)
+}
+
+func TestPatchPodWithOtherOwnerRef(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	// add to podStore one more matching pod that doesn't have a controller
+	// ref, but has an owner ref pointing to other object. Expect a patch to
+	// take control of it.
+	unrelatedOwnerReference := api.OwnerReference{UID: util.NewUUID(), APIVersion: "batch/v1", Kind: "Job", Name: "Job"}
+	pod := newPod("pod", rs, api.PodRunning)
+	pod.OwnerReferences = []api.OwnerReference{unrelatedOwnerReference}
+	manager.podStore.Indexer.Add(pod)
+
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// 1 patch to take control of pod, and 1 create of new pod.
+	validateSyncReplicaSet(t, fakePodControl, 1, 0, 1)
+}
+
+func TestPatchPodWithCorrectOwnerRef(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	// add to podStore a matching pod that has an ownerRef pointing to the rs,
+	// but ownerRef.Controller is false. Expect a patch to take control it.
+	rsOwnerReference := api.OwnerReference{UID: rs.UID, APIVersion: "v1", Kind: "ReplicaSet", Name: rs.Name}
+	pod := newPod("pod", rs, api.PodRunning)
+	pod.OwnerReferences = []api.OwnerReference{rsOwnerReference}
+	manager.podStore.Indexer.Add(pod)
+
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// 1 patch to take control of pod, and 1 create of new pod.
+	validateSyncReplicaSet(t, fakePodControl, 1, 0, 1)
+}
+
+func TestPatchPodFails(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	// add to podStore two matching pods. Expect two patches to take control
+	// them.
+	manager.podStore.Indexer.Add(newPod("pod1", rs, api.PodRunning))
+	manager.podStore.Indexer.Add(newPod("pod2", rs, api.PodRunning))
+	// let both patches fail. The rs controller will assume it fails to take
+	// control of the pods and create new ones.
+	fakePodControl.Err = fmt.Errorf("Fake Error")
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// 2 patches to take control of pod1 and pod2 (both fail), 2 creates.
+	validateSyncReplicaSet(t, fakePodControl, 2, 0, 2)
+}
+
+func TestPatchExtraPodsThenDelete(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	// add to podStore three matching pods. Expect three patches to take control
+	// them, and later delete one of them.
+	manager.podStore.Indexer.Add(newPod("pod1", rs, api.PodRunning))
+	manager.podStore.Indexer.Add(newPod("pod2", rs, api.PodRunning))
+	manager.podStore.Indexer.Add(newPod("pod3", rs, api.PodRunning))
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// 3 patches to take control of the pods, and 1 deletion because there is an extra pod.
+	validateSyncReplicaSet(t, fakePodControl, 0, 1, 3)
+}
+
+func TestUpdateLabelsRemoveControllerRef(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	manager.rsStore.Store.Add(rs)
+	// put one pod in the podStore
+	pod := newPod("pod", rs, api.PodRunning)
+	var trueVar = true
+	rsOwnerReference := api.OwnerReference{UID: rs.UID, APIVersion: "v1beta1", Kind: "ReplicaSet", Name: rs.Name, Controller: &trueVar}
+	pod.OwnerReferences = []api.OwnerReference{rsOwnerReference}
+	updatedPod := *pod
+	// reset the labels
+	updatedPod.Labels = make(map[string]string)
+	// add the updatedPod to the store. This is consistent with the behavior of
+	// the Informer: Informer updates the store before call the handler
+	// (updatePod() in this case).
+	manager.podStore.Indexer.Add(&updatedPod)
+	// send a update of the same pod with modified labels
+	manager.updatePod(pod, &updatedPod)
+	// verifies that rs is added to the queue
+	rsKey := getKey(rs, t)
+	queueRS, _ := manager.queue.Get()
+	if queueRS != rsKey {
+		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
+	}
+	manager.queue.Done(queueRS)
+	err := manager.syncReplicaSet(rsKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// expect 1 patch to be sent to remove the controllerRef for the pod.
+	// expect 2 creates because the rs.Spec.Replicas=2 and there exists no
+	// matching pod.
+	validateSyncReplicaSet(t, fakePodControl, 2, 0, 1)
+	fakePodControl.Clear()
+}
+
+func TestUpdateSelectorControllerRef(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	// put 2 pods in the podStore
+	newPodList(manager.podStore.Indexer, 2, api.PodRunning, labelMap, rs, "pod")
+	// update the RS so that its selector no longer matches the pods
+	updatedRS := *rs
+	updatedRS.Spec.Selector.MatchLabels = map[string]string{"foo": "baz"}
+	// put the updatedRS into the store. This is consistent with the behavior of
+	// the Informer: Informer updates the store before call the handler
+	// (updateRS() in this case).
+	manager.rsStore.Store.Add(&updatedRS)
+	manager.updateRS(rs, &updatedRS)
+	// verifies that the rs is added to the queue
+	rsKey := getKey(rs, t)
+	queueRS, _ := manager.queue.Get()
+	if queueRS != rsKey {
+		t.Fatalf("Expected to find key %v in queue, found %v", rsKey, queueRS)
+	}
+	manager.queue.Done(queueRS)
+	err := manager.syncReplicaSet(rsKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// expect 2 patches to be sent to remove the controllerRef for the pods.
+	// expect 2 creates because the rc.Spec.Replicas=2 and there exists no
+	// matching pod.
+	validateSyncReplicaSet(t, fakePodControl, 2, 0, 2)
+	fakePodControl.Clear()
+}
+
+// RS controller shouldn't adopt or create more pods if the rc is about to be
+// deleted.
+func TestDoNotAdoptOrCreateIfBeingDeleted(t *testing.T) {
+	manager, fakePodControl := setupManagerWithGCEnabled()
+	labelMap := map[string]string{"foo": "bar"}
+	rs := newReplicaSet(2, labelMap)
+	now := unversioned.Now()
+	rs.DeletionTimestamp = &now
+	manager.rsStore.Store.Add(rs)
+	pod1 := newPod("pod1", rs, api.PodRunning)
+	manager.podStore.Indexer.Add(pod1)
+
+	// no patch, no create
+	err := manager.syncReplicaSet(getKey(rs, t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	validateSyncReplicaSet(t, fakePodControl, 0, 0, 0)
+}

pkg/controller/replication/replication_controller.go

@@ -615,12 +615,6 @@ func (rm *ReplicationManager) syncReplicationController(key string) error {
 	trace.Step("ReplicationController restored")
 	rcNeedsSync := rm.expectations.SatisfiedExpectations(rcKey)
 	trace.Step("Expectations restored")
-	if err != nil {
-		glog.Errorf("Error getting pods for rc %q: %v", key, err)
-		rm.queue.Add(key)
-		return err
-	}
-	trace.Step("Pods listed")
 
 	// TODO: Do the List and Filter in a single pass, or use an index.
 	var filteredPods []*api.Pod
@@ -653,7 +647,7 @@ func (rm *ReplicationManager) syncReplicationController(key string) error {
 		for _, pod := range controlledDoesNotMatch {
 			err := cm.ReleasePod(pod)
 			if err != nil {
-				errlist = append(errlist, cm.ReleasePod(pod))
+				errlist = append(errlist, err)
 			}
 		}
 		if len(errlist) != 0 {

test/integration/replicaset/replicaset_test.go

@@ -0,0 +1,464 @@
+// +build integration,!no-etcd
+
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package replicaset
+
+import (
+	"fmt"
+	"net/http/httptest"
+	"reflect"
+	"testing"
+	"time"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/unversioned"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/apis/extensions/v1beta1"
+	internalclientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
+	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/release_1_3"
+	"k8s.io/kubernetes/pkg/client/restclient"
+	controllerframwork "k8s.io/kubernetes/pkg/controller/framework"
+	"k8s.io/kubernetes/pkg/controller/framework/informers"
+	"k8s.io/kubernetes/pkg/controller/replicaset"
+	"k8s.io/kubernetes/pkg/util/wait"
+	"k8s.io/kubernetes/test/integration/framework"
+)
+
+func testLabels() map[string]string {
+	return map[string]string{"name": "test"}
+}
+
+func newRS(name, namespace string, replicas int) *v1beta1.ReplicaSet {
+	replicasCopy := int32(replicas)
+	return &v1beta1.ReplicaSet{
+		TypeMeta: unversioned.TypeMeta{
+			Kind:       "ReplicaSet",
+			APIVersion: "extensions/v1beta1",
+		},
+		ObjectMeta: v1.ObjectMeta{
+			Namespace: namespace,
+			Name:      name,
+		},
+		Spec: v1beta1.ReplicaSetSpec{
+			Selector: &v1beta1.LabelSelector{
+				MatchLabels: testLabels(),
+			},
+			Replicas: &replicasCopy,
+			Template: v1.PodTemplateSpec{
+				ObjectMeta: v1.ObjectMeta{
+					Labels: testLabels(),
+				},
+				Spec: v1.PodSpec{
+					Containers: []v1.Container{
+						{
+							Name:  "fake-name",
+							Image: "fakeimage",
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func newMatchingPod(podName, namespace string) *v1.Pod {
+	return &v1.Pod{
+		TypeMeta: unversioned.TypeMeta{
+			Kind:       "Pod",
+			APIVersion: "v1",
+		},
+		ObjectMeta: v1.ObjectMeta{
+			Name:      podName,
+			Namespace: namespace,
+			Labels:    testLabels(),
+		},
+		Spec: v1.PodSpec{
+			Containers: []v1.Container{
+				{
+					Name:  "fake-name",
+					Image: "fakeimage",
+				},
+			},
+		},
+		Status: v1.PodStatus{
+			Phase: v1.PodRunning,
+		},
+	}
+}
+
+// verifyRemainingObjects verifies if the number of the remaining replica
+// sets and pods are rsNum and podNum. It returns error if the
+// communication with the API server fails.
+func verifyRemainingObjects(t *testing.T, clientSet clientset.Interface, namespace string, rsNum, podNum int) (bool, error) {
+	rsClient := clientSet.Extensions().ReplicaSets(namespace)
+	podClient := clientSet.Core().Pods(namespace)
+	pods, err := podClient.List(api.ListOptions{})
+	if err != nil {
+		return false, fmt.Errorf("Failed to list pods: %v", err)
+	}
+	var ret = true
+	if len(pods.Items) != podNum {
+		ret = false
+		t.Logf("expect %d pods, got %d pods", podNum, len(pods.Items))
+	}
+	rss, err := rsClient.List(api.ListOptions{})
+	if err != nil {
+		return false, fmt.Errorf("Failed to list replica sets: %v", err)
+	}
+	if len(rss.Items) != rsNum {
+		ret = false
+		t.Logf("expect %d RSs, got %d RSs", rsNum, len(rss.Items))
+	}
+	return ret, nil
+}
+
+func rmSetup(t *testing.T, enableGarbageCollector bool) (*httptest.Server, *replicaset.ReplicaSetController, controllerframwork.SharedIndexInformer, clientset.Interface) {
+	masterConfig := framework.NewIntegrationTestMasterConfig()
+	masterConfig.EnableCoreControllers = false
+	_, s := framework.RunAMaster(masterConfig)
+
+	config := restclient.Config{Host: s.URL}
+	clientSet, err := clientset.NewForConfig(&config)
+	if err != nil {
+		t.Fatalf("Error in create clientset: %v", err)
+	}
+	resyncPeriod := 12 * time.Hour
+	resyncPeriodFunc := func() time.Duration {
+		return resyncPeriod
+	}
+	podInformer := informers.CreateSharedPodIndexInformer(internalclientset.NewForConfigOrDie(restclient.AddUserAgent(&config, "pod-informer")), resyncPeriod)
+	rm := replicaset.NewReplicaSetController(
+		podInformer,
+		internalclientset.NewForConfigOrDie(restclient.AddUserAgent(&config, "replicaset-controller")),
+		resyncPeriodFunc,
+		replicaset.BurstReplicas,
+		4096,
+		enableGarbageCollector,
+	)
+
+	if err != nil {
+		t.Fatalf("Failed to create replicaset controller")
+	}
+	return s, rm, podInformer, clientSet
+}
+
+func TestAdoption(t *testing.T) {
+	var trueVar = true
+	testCases := []struct {
+		name                    string
+		existingOwnerReferences func(rs *v1beta1.ReplicaSet) []v1.OwnerReference
+		expectedOwnerReferences func(rs *v1beta1.ReplicaSet) []v1.OwnerReference
+	}{
+		{
+			"pod refers rs as an owner, not a controller",
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet"}}
+			},
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar}}
+			},
+		},
+		{
+			"pod doesn't have owner references",
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{}
+			},
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar}}
+			},
+		},
+		{
+			"pod refers rs as a controller",
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar}}
+			},
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar}}
+			},
+		},
+		{
+			"pod refers other rs as the controller, refers the rs as an owner",
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{
+					{UID: "1", Name: "anotherRS", APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar},
+					{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet"},
+				}
+			},
+			func(rs *v1beta1.ReplicaSet) []v1.OwnerReference {
+				return []v1.OwnerReference{
+					{UID: "1", Name: "anotherRS", APIVersion: "extensions/v1beta1", Kind: "ReplicaSet", Controller: &trueVar},
+					{UID: rs.UID, Name: rs.Name, APIVersion: "extensions/v1beta1", Kind: "ReplicaSet"},
+				}
+			},
+		},
+	}
+	for i, tc := range testCases {
+		s, rm, podInformer, clientSet := rmSetup(t, true)
+		ns := framework.CreateTestingNamespace(fmt.Sprintf("rs-adoption-%d", i), s, t)
+		defer framework.DeleteTestingNamespace(ns, s, t)
+
+		rsClient := clientSet.Extensions().ReplicaSets(ns.Name)
+		podClient := clientSet.Core().Pods(ns.Name)
+		const rsName = "rs"
+		rs, err := rsClient.Create(newRS(rsName, ns.Name, 1))
+		if err != nil {
+			t.Fatalf("Failed to create replica set: %v", err)
+		}
+		podName := fmt.Sprintf("pod%d", i)
+		pod := newMatchingPod(podName, ns.Name)
+		pod.OwnerReferences = tc.existingOwnerReferences(rs)
+		_, err = podClient.Create(pod)
+		if err != nil {
+			t.Fatalf("Failed to create Pod: %v", err)
+		}
+
+		stopCh := make(chan struct{})
+		go podInformer.Run(stopCh)
+		// wait for the podInformer to observe the pod, otherwise the rs controller
+		// will try to create a new pod rather than adopting the existing one.
+		if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+			objects := podInformer.GetIndexer().List()
+			for _, object := range objects {
+				pod, ok := object.(*api.Pod)
+				if !ok {
+					t.Fatal("expect object to be a pod")
+				}
+				if pod.Name == podName {
+					return true, nil
+				}
+			}
+			return false, nil
+		}); err != nil {
+			t.Fatal(err)
+		}
+		go rm.Run(5, stopCh)
+		if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+			updatedPod, err := podClient.Get(pod.Name)
+			if err != nil {
+				return false, err
+			}
+			if e, a := tc.expectedOwnerReferences(rs), updatedPod.OwnerReferences; reflect.DeepEqual(e, a) {
+				return true, nil
+			} else {
+				t.Logf("ownerReferences don't match, expect %v, got %v", e, a)
+				return false, nil
+			}
+		}); err != nil {
+			t.Fatal(err)
+		}
+		close(stopCh)
+	}
+}
+
+func createRSsPods(t *testing.T, clientSet clientset.Interface, rss []*v1beta1.ReplicaSet, pods []*v1.Pod, ns string) {
+	rsClient := clientSet.Extensions().ReplicaSets(ns)
+	podClient := clientSet.Core().Pods(ns)
+	for _, rs := range rss {
+		if _, err := rsClient.Create(rs); err != nil {
+			t.Fatalf("Failed to create replica set %s: %v", rs.Name, err)
+		}
+	}
+	for _, pod := range pods {
+		if _, err := podClient.Create(pod); err != nil {
+			t.Fatalf("Failed to create pod %s: %v", pod.Name, err)
+		}
+	}
+}
+
+func waitRSStable(t *testing.T, clientSet clientset.Interface, rs *v1beta1.ReplicaSet, ns string) {
+	rsClient := clientSet.Extensions().ReplicaSets(ns)
+	if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+		updatedRS, err := rsClient.Get(rs.Name)
+		if err != nil {
+			return false, err
+		}
+		if updatedRS.Status.Replicas != *rs.Spec.Replicas {
+			return false, nil
+		} else {
+			return true, nil
+		}
+	}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestUpdateSelectorToAdopt(t *testing.T) {
+	// We have pod1, pod2 and rs. rs.spec.replicas=1. At first rs.Selector
+	// matches pod1 only; change the selector to match pod2 as well. Verify
+	// there is only one pod left.
+	s, rm, podInformer, clientSet := rmSetup(t, true)
+	ns := framework.CreateTestingNamespace("rs-update-selector-to-adopt", s, t)
+	defer framework.DeleteTestingNamespace(ns, s, t)
+	rs := newRS("rs", ns.Name, 1)
+	// let rs's selector only match pod1
+	rs.Spec.Selector.MatchLabels["uniqueKey"] = "1"
+	rs.Spec.Template.Labels["uniqueKey"] = "1"
+	pod1 := newMatchingPod("pod1", ns.Name)
+	pod1.Labels["uniqueKey"] = "1"
+	pod2 := newMatchingPod("pod2", ns.Name)
+	pod2.Labels["uniqueKey"] = "2"
+	createRSsPods(t, clientSet, []*v1beta1.ReplicaSet{rs}, []*v1.Pod{pod1, pod2}, ns.Name)
+
+	stopCh := make(chan struct{})
+	go podInformer.Run(stopCh)
+	go rm.Run(5, stopCh)
+	waitRSStable(t, clientSet, rs, ns.Name)
+
+	// change the rs's selector to match both pods
+	patch := `{"spec":{"selector":{"matchLabels": {"uniqueKey":null}}}}`
+	rsClient := clientSet.Extensions().ReplicaSets(ns.Name)
+	rs, err := rsClient.Patch(rs.Name, api.StrategicMergePatchType, []byte(patch))
+	if err != nil {
+		t.Fatalf("Failed to patch replica set: %v", err)
+	}
+	t.Logf("patched rs = %#v", rs)
+	// wait for the rs select both pods and delete one of them
+	if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+		return verifyRemainingObjects(t, clientSet, ns.Name, 1, 1)
+	}); err != nil {
+		t.Fatal(err)
+	}
+	close(stopCh)
+}
+
+func TestUpdateSelectorToRemoveControllerRef(t *testing.T) {
+	// We have pod1, pod2 and rs. rs.spec.replicas=2. At first rs.Selector
+	// matches pod1 and pod2; change the selector to match only pod1. Verify
+	// that rs creates one more pod, so there are 3 pods. Also verify that
+	// pod2's controllerRef is cleared.
+	s, rm, podInformer, clientSet := rmSetup(t, true)
+	ns := framework.CreateTestingNamespace("rs-update-selector-to-remove-controllerref", s, t)
+	defer framework.DeleteTestingNamespace(ns, s, t)
+	rs := newRS("rs", ns.Name, 2)
+	pod1 := newMatchingPod("pod1", ns.Name)
+	pod1.Labels["uniqueKey"] = "1"
+	pod2 := newMatchingPod("pod2", ns.Name)
+	pod2.Labels["uniqueKey"] = "2"
+	createRSsPods(t, clientSet, []*v1beta1.ReplicaSet{rs}, []*v1.Pod{pod1, pod2}, ns.Name)
+
+	stopCh := make(chan struct{})
+	go podInformer.Run(stopCh)
+	go rm.Run(5, stopCh)
+	waitRSStable(t, clientSet, rs, ns.Name)
+
+	// change the rs's selector to match both pods
+	patch := `{"spec":{"selector":{"matchLabels": {"uniqueKey":"1"}},"template":{"metadata":{"labels":{"uniqueKey":"1"}}}}}`
+	rsClient := clientSet.Extensions().ReplicaSets(ns.Name)
+	rs, err := rsClient.Patch(rs.Name, api.StrategicMergePatchType, []byte(patch))
+	if err != nil {
+		t.Fatalf("Failed to patch replica set: %v", err)
+	}
+	t.Logf("patched rs = %#v", rs)
+	// wait for the rs to create one more pod
+	if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+		return verifyRemainingObjects(t, clientSet, ns.Name, 1, 3)
+	}); err != nil {
+		t.Fatal(err)
+	}
+	podClient := clientSet.Core().Pods(ns.Name)
+	pod2, err = podClient.Get(pod2.Name)
+	if err != nil {
+		t.Fatalf("Failed to get pod2: %v", err)
+	}
+	if len(pod2.OwnerReferences) != 0 {
+		t.Fatalf("ownerReferences of pod2 is not cleared, got %#v", pod2.OwnerReferences)
+	}
+	close(stopCh)
+}
+
+func TestUpdateLabelToRemoveControllerRef(t *testing.T) {
+	// We have pod1, pod2 and rs. rs.spec.replicas=2. At first rs.Selector
+	// matches pod1 and pod2; change pod2's lables to non-matching. Verify
+	// that rs creates one more pod, so there are 3 pods. Also verify that
+	// pod2's controllerRef is cleared.
+	s, rm, podInformer, clientSet := rmSetup(t, true)
+	ns := framework.CreateTestingNamespace("rs-update-label-to-remove-controllerref", s, t)
+	defer framework.DeleteTestingNamespace(ns, s, t)
+	rs := newRS("rs", ns.Name, 2)
+	pod1 := newMatchingPod("pod1", ns.Name)
+	pod2 := newMatchingPod("pod2", ns.Name)
+	createRSsPods(t, clientSet, []*v1beta1.ReplicaSet{rs}, []*v1.Pod{pod1, pod2}, ns.Name)
+
+	stopCh := make(chan struct{})
+	go podInformer.Run(stopCh)
+	go rm.Run(5, stopCh)
+	waitRSStable(t, clientSet, rs, ns.Name)
+
+	// change the rs's selector to match both pods
+	patch := `{"metadata":{"labels":{"name":null}}}`
+	podClient := clientSet.Core().Pods(ns.Name)
+	pod2, err := podClient.Patch(pod2.Name, api.StrategicMergePatchType, []byte(patch))
+	if err != nil {
+		t.Fatalf("Failed to patch pod2: %v", err)
+	}
+	t.Logf("patched pod2 = %#v", pod2)
+	// wait for the rs to create one more pod
+	if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+		return verifyRemainingObjects(t, clientSet, ns.Name, 1, 3)
+	}); err != nil {
+		t.Fatal(err)
+	}
+	pod2, err = podClient.Get(pod2.Name)
+	if err != nil {
+		t.Fatalf("Failed to get pod2: %v", err)
+	}
+	if len(pod2.OwnerReferences) != 0 {
+		t.Fatalf("ownerReferences of pod2 is not cleared, got %#v", pod2.OwnerReferences)
+	}
+	close(stopCh)
+}
+
+func TestUpdateLabelToBeAdopted(t *testing.T) {
+	// We have pod1, pod2 and rs. rs.spec.replicas=1. At first rs.Selector
+	// matches pod1 only; change pod2's lables to be matching. Verify the RS
+	// controller adopts pod2 and delete one of them, so there is only 1 pod
+	// left.
+	s, rm, podInformer, clientSet := rmSetup(t, true)
+	ns := framework.CreateTestingNamespace("rs-update-label-to-be-adopted", s, t)
+	defer framework.DeleteTestingNamespace(ns, s, t)
+	rs := newRS("rs", ns.Name, 1)
+	// let rs's selector only matches pod1
+	rs.Spec.Selector.MatchLabels["uniqueKey"] = "1"
+	rs.Spec.Template.Labels["uniqueKey"] = "1"
+	pod1 := newMatchingPod("pod1", ns.Name)
+	pod1.Labels["uniqueKey"] = "1"
+	pod2 := newMatchingPod("pod2", ns.Name)
+	pod2.Labels["uniqueKey"] = "2"
+	createRSsPods(t, clientSet, []*v1beta1.ReplicaSet{rs}, []*v1.Pod{pod1, pod2}, ns.Name)
+
+	stopCh := make(chan struct{})
+	go podInformer.Run(stopCh)
+	go rm.Run(5, stopCh)
+	waitRSStable(t, clientSet, rs, ns.Name)
+
+	// change the rs's selector to match both pods
+	patch := `{"metadata":{"labels":{"uniqueKey":"1"}}}`
+	podClient := clientSet.Core().Pods(ns.Name)
+	pod2, err := podClient.Patch(pod2.Name, api.StrategicMergePatchType, []byte(patch))
+	if err != nil {
+		t.Fatalf("Failed to patch pod2: %v", err)
+	}
+	t.Logf("patched pod2 = %#v", pod2)
+	// wait for the rs to select both pods and delete one of them
+	if err := wait.Poll(10*time.Second, 60*time.Second, func() (bool, error) {
+		return verifyRemainingObjects(t, clientSet, ns.Name, 1, 1)
+	}); err != nil {
+		t.Fatal(err)
+	}
+	close(stopCh)
+}

test/integration/replicationcontroller/replicationcontroller_test.go

@@ -16,7 +16,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package integration
+package replicationcontroller
 
 import (
 	"fmt"