// syncReplicationController will sync the rc with the given key if it has had its expectations fulfilled, meaning // it did not expect to see any more of its pods created or deleted. This function is not meant to be invoked // concurrently with the same key. func (rm *ReplicationManager) syncReplicationController(key string) error { startTime := time.Now() defer func() { glog.V(4).Infof("Finished syncing controller %q (%v)", key, time.Now().Sub(startTime)) }() obj, exists, err := rm.rcStore.Store.GetByKey(key) if !exists { glog.Infof("Replication Controller has been deleted %v", key) rm.expectations.DeleteExpectations(key) return nil } if err != nil { glog.Infof("Unable to retrieve rc %v from store: %v", key, err) rm.queue.Add(key) return err } rc := *obj.(*api.ReplicationController) if !rm.podStoreSynced() { // Sleep so we give the pod reflector goroutine a chance to run. time.Sleep(PodStoreSyncedPollPeriod) glog.Infof("Waiting for pods controller to sync, requeuing rc %v", rc.Name) rm.enqueueController(&rc) return nil } // Check the expectations of the rc before counting active pods, otherwise a new pod can sneak in // and update the expectations after we've retrieved active pods from the store. If a new pod enters // the store after we've checked the expectation, the rc sync is just deferred till the next relist. rcKey, err := controller.KeyFunc(&rc) if err != nil { glog.Errorf("Couldn't get key for replication controller %#v: %v", rc, err) return err } rcNeedsSync := rm.expectations.SatisfiedExpectations(rcKey) podList, err := rm.podStore.Pods(rc.Namespace).List(labels.Set(rc.Spec.Selector).AsSelector()) if err != nil { glog.Errorf("Error getting pods for rc %q: %v", key, err) rm.queue.Add(key) return err } // TODO: Do this in a single pass, or use an index. filteredPods := controller.FilterActivePods(podList.Items) if rcNeedsSync { rm.manageReplicas(filteredPods, &rc) } // Always updates status as pods come up or die. if err := updateReplicaCount(rm.kubeClient.ReplicationControllers(rc.Namespace), rc, len(filteredPods)); err != nil { // Multiple things could lead to this update failing. Requeuing the controller ensures // we retry with some fairness. glog.V(2).Infof("Failed to update replica count for controller %v, requeuing", rc.Name) rm.enqueueController(&rc) } return nil }
// TODO #2726: The controller should populate the current state, not the apiserver func (rs *REST) fillCurrentState(ctx api.Context, controller *api.ReplicationController) error { if rs.podLister == nil { return nil } list, err := rs.podLister.ListPods(ctx, labels.Set(controller.Spec.Selector).AsSelector()) if err != nil { return err } controller.Status.Replicas = len(rc.FilterActivePods(list.Items)) return nil }