Golang endpoints.RepackSubsets函数代码示例

// ReconcileEndpoints sets the endpoints for the given apiserver service (ro or rw).
// ReconcileEndpoints expects that the endpoints objects it manages will all be
// managed only by ReconcileEndpoints; therefore, to understand this, you need only
// understand the requirements and the body of this function.
//
// Requirements:
//  * All apiservers MUST use the same ports for their {rw, ro} services.
//  * All apiservers MUST use ReconcileEndpoints and only ReconcileEndpoints to manage the
//      endpoints for their {rw, ro} services.
//  * All apiservers MUST know and agree on the number of apiservers expected
//      to be running (c.masterCount).
//  * ReconcileEndpoints is called periodically from all apiservers.
//
func (c *Controller) ReconcileEndpoints(serviceName string, ip net.IP, endpointPorts []api.EndpointPort, reconcilePorts bool) error {
	ctx := api.NewDefaultContext()
	e, err := c.EndpointRegistry.GetEndpoints(ctx, serviceName)
	if err != nil {
		e = &api.Endpoints{
			ObjectMeta: api.ObjectMeta{
				Name:      serviceName,
				Namespace: api.NamespaceDefault,
				Tenant:    api.TenantDefault,
			},
		}
	}

	// First, determine if the endpoint is in the format we expect (one
	// subset, ports matching endpointPorts, N IP addresses).
	formatCorrect, ipCorrect, portsCorrect := checkEndpointSubsetFormat(e, ip.String(), endpointPorts, c.MasterCount, reconcilePorts)
	if !formatCorrect {
		// Something is egregiously wrong, just re-make the endpoints record.
		e.Subsets = []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{{IP: ip.String()}},
			Ports:     endpointPorts,
		}}
		glog.Warningf("Resetting endpoints for master service %q to %v", serviceName, e)
		return c.EndpointRegistry.UpdateEndpoints(ctx, e)
	}
	if ipCorrect && portsCorrect {
		return nil
	}
	if !ipCorrect {
		// We *always* add our own IP address.
		e.Subsets[0].Addresses = append(e.Subsets[0].Addresses, api.EndpointAddress{IP: ip.String()})

		// Lexicographic order is retained by this step.
		e.Subsets = endpoints.RepackSubsets(e.Subsets)

		// If too many IP addresses, remove the ones lexicographically after our
		// own IP address.  Given the requirements stated at the top of
		// this function, this should cause the list of IP addresses to
		// become eventually correct.
		if addrs := &e.Subsets[0].Addresses; len(*addrs) > c.MasterCount {
			// addrs is a pointer because we're going to mutate it.
			for i, addr := range *addrs {
				if addr.IP == ip.String() {
					for len(*addrs) > c.MasterCount {
						// wrap around if necessary.
						remove := (i + 1) % len(*addrs)
						*addrs = append((*addrs)[:remove], (*addrs)[remove+1:]...)
					}
					break
				}
			}
		}
	}
	if !portsCorrect {
		// Reset ports.
		e.Subsets[0].Ports = endpointPorts
	}
	glog.Warningf("Resetting endpoints for master service %q to %v", serviceName, e)
	return c.EndpointRegistry.UpdateEndpoints(ctx, e)
}

// SetEndpoints sets the endpoints for the given apiserver service (ro or rw).
// SetEndpoints expects that the endpoints objects it manages will all be
// managed only by SetEndpoints; therefore, to understand this, you need only
// understand the requirements and the body of this function.
//
// Requirements:
//  * All apiservers MUST use the same ports for their {rw, ro} services.
//  * All apiservers MUST use SetEndpoints and only SetEndpoints to manage the
//      endpoints for their {rw, ro} services.
//  * All apiservers MUST know and agree on the number of apiservers expected
//      to be running (c.masterCount).
//  * SetEndpoints is called periodically from all apiservers.
//
func (c *Controller) SetEndpoints(serviceName string, ip net.IP, port int) error {
	ctx := api.NewDefaultContext()
	e, err := c.EndpointRegistry.GetEndpoints(ctx, serviceName)
	if err != nil {
		e = &api.Endpoints{
			ObjectMeta: api.ObjectMeta{
				Name:      serviceName,
				Namespace: api.NamespaceDefault,
			},
		}
	}

	// First, determine if the endpoint is in the format we expect (one
	// subset, one port, N IP addresses).
	formatCorrect, ipCorrect := checkEndpointSubsetFormat(e, ip.String(), port, c.MasterCount)
	if !formatCorrect {
		// Something is egregiously wrong, just re-make the endpoints record.
		e.Subsets = []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{{IP: ip.String()}},
			Ports:     []api.EndpointPort{{Port: port, Protocol: api.ProtocolTCP}},
		}}
		glog.Warningf("Resetting endpoints for master service %q to %v", serviceName, e)
		return c.EndpointRegistry.UpdateEndpoints(ctx, e)
	} else if !ipCorrect {
		// We *always* add our own IP address; if there are too many IP
		// addresses, we remove the ones lexicographically after our
		// own IP address.  Given the requirements stated at the top of
		// this function, this should cause the list of IP addresses to
		// become eventually correct.
		e.Subsets[0].Addresses = append(e.Subsets[0].Addresses, api.EndpointAddress{IP: ip.String()})
		e.Subsets = endpoints.RepackSubsets(e.Subsets)
		if addrs := &e.Subsets[0].Addresses; len(*addrs) > c.MasterCount {
			// addrs is a pointer because we're going to mutate it.
			for i, addr := range *addrs {
				if addr.IP == ip.String() {
					for len(*addrs) > c.MasterCount {
						remove := (i + 1) % len(*addrs)
						*addrs = append((*addrs)[:remove], (*addrs)[remove+1:]...)
					}
					break
				}
			}
		}
		return c.EndpointRegistry.UpdateEndpoints(ctx, e)
	}
	// We didn't make any changes, no need to actually call update.
	return nil
}

// Canonicalize normalizes the object after validation.
func (endpointsStrategy) Canonicalize(obj runtime.Object) {
	endpoints := obj.(*api.Endpoints)
	endpoints.Subsets = endptspkg.RepackSubsets(endpoints.Subsets)
}

//.........这里部分代码省略.........
				continue
			}

			epp := api.EndpointPort{Name: portName, Port: int32(portNum), Protocol: portProto}
			epa := api.EndpointAddress{
				IP: pod.Status.PodIP,
				TargetRef: &api.ObjectReference{
					Kind:            "Pod",
					Namespace:       pod.ObjectMeta.Namespace,
					Name:            pod.ObjectMeta.Name,
					UID:             pod.ObjectMeta.UID,
					ResourceVersion: pod.ObjectMeta.ResourceVersion,
				}}

			hostname := getHostname(pod)
			if len(hostname) > 0 &&
				getSubdomain(pod) == service.Name &&
				service.Namespace == pod.Namespace {
				hostRecord := endpoints.HostRecord{
					HostName: hostname,
				}
				// TODO: stop populating podHostNames annotation in 1.4
				podHostNames[string(pod.Status.PodIP)] = hostRecord
				epa.Hostname = hostname
			}

			if tolerateUnreadyEndpoints || api.IsPodReady(pod) {
				subsets = append(subsets, api.EndpointSubset{
					Addresses: []api.EndpointAddress{epa},
					Ports:     []api.EndpointPort{epp},
				})
			} else {
				glog.V(5).Infof("Pod is out of service: %v/%v", pod.Namespace, pod.Name)
				subsets = append(subsets, api.EndpointSubset{
					NotReadyAddresses: []api.EndpointAddress{epa},
					Ports:             []api.EndpointPort{epp},
				})
			}
		}
	}
	subsets = endpoints.RepackSubsets(subsets)

	// See if there's actually an update here.
	currentEndpoints, err := e.client.Endpoints(service.Namespace).Get(service.Name)
	if err != nil {
		if errors.IsNotFound(err) {
			currentEndpoints = &api.Endpoints{
				ObjectMeta: api.ObjectMeta{
					Name:   service.Name,
					Labels: service.Labels,
				},
			}
		} else {
			glog.Errorf("Error getting endpoints: %v", err)
			e.queue.Add(key) // Retry
			return
		}
	}

	serializedPodHostNames := ""
	if len(podHostNames) > 0 {
		b, err := json.Marshal(podHostNames)
		if err != nil {
			glog.Errorf("Error updating endpoints. Marshalling of hostnames failed.: %v", err)
			e.queue.Add(key) // Retry
			return
		}
		serializedPodHostNames = string(b)
	}

	newAnnotations := make(map[string]string)
	newAnnotations[endpoints.PodHostnamesAnnotation] = serializedPodHostNames
	if reflect.DeepEqual(currentEndpoints.Subsets, subsets) &&
		reflect.DeepEqual(currentEndpoints.Labels, service.Labels) {
		glog.V(5).Infof("endpoints are equal for %s/%s, skipping update", service.Namespace, service.Name)
		return
	}
	newEndpoints := currentEndpoints
	newEndpoints.Subsets = subsets
	newEndpoints.Labels = service.Labels
	if newEndpoints.Annotations == nil {
		newEndpoints.Annotations = make(map[string]string)
	}
	if len(serializedPodHostNames) == 0 {
		delete(newEndpoints.Annotations, endpoints.PodHostnamesAnnotation)
	} else {
		newEndpoints.Annotations[endpoints.PodHostnamesAnnotation] = serializedPodHostNames
	}
	if len(currentEndpoints.ResourceVersion) == 0 {
		// No previous endpoints, create them
		_, err = e.client.Endpoints(service.Namespace).Create(newEndpoints)
	} else {
		// Pre-existing
		_, err = e.client.Endpoints(service.Namespace).Update(newEndpoints)
	}
	if err != nil {
		glog.Errorf("Error updating endpoints: %v", err)
		e.queue.Add(key) // Retry
	}
}

//.........这里部分代码省略.........
					Namespace:       pod.ObjectMeta.Namespace,
					Name:            pod.ObjectMeta.Name,
					UID:             pod.ObjectMeta.UID,
					ResourceVersion: pod.ObjectMeta.ResourceVersion,
				}}

			hostname := getHostname(pod)
			if len(hostname) > 0 &&
				getSubdomain(pod) == service.Name &&
				service.Namespace == pod.Namespace {
				hostRecord := endpoints.HostRecord{
					HostName: hostname,
				}
				// TODO: stop populating podHostNames annotation in 1.4
				podHostNames[string(pod.Status.PodIP)] = hostRecord
				epa.Hostname = hostname
			}

			if tolerateUnreadyEndpoints || api.IsPodReady(pod) {
				subsets = append(subsets, api.EndpointSubset{
					Addresses: []api.EndpointAddress{epa},
					Ports:     []api.EndpointPort{epp},
				})
				readyEps++
			} else {
				glog.V(5).Infof("Pod is out of service: %v/%v", pod.Namespace, pod.Name)
				subsets = append(subsets, api.EndpointSubset{
					NotReadyAddresses: []api.EndpointAddress{epa},
					Ports:             []api.EndpointPort{epp},
				})
				notReadyEps++
			}
		}
	}
	subsets = endpoints.RepackSubsets(subsets)

	// See if there's actually an update here.
	currentEndpoints, err := e.client.Core().Endpoints(service.Namespace).Get(service.Name)
	if err != nil {
		if errors.IsNotFound(err) {
			currentEndpoints = &api.Endpoints{
				ObjectMeta: api.ObjectMeta{
					Name:   service.Name,
					Labels: service.Labels,
				},
			}
		} else {
			return err
		}
	}

	serializedPodHostNames := ""
	if len(podHostNames) > 0 {
		b, err := json.Marshal(podHostNames)
		if err != nil {
			return err
		}
		serializedPodHostNames = string(b)
	}

	newAnnotations := make(map[string]string)
	newAnnotations[endpoints.PodHostnamesAnnotation] = serializedPodHostNames
	if reflect.DeepEqual(currentEndpoints.Subsets, subsets) &&
		reflect.DeepEqual(currentEndpoints.Labels, service.Labels) {
		glog.V(5).Infof("endpoints are equal for %s/%s, skipping update", service.Namespace, service.Name)
		return nil
	}
	newEndpoints := currentEndpoints
	newEndpoints.Subsets = subsets
	newEndpoints.Labels = service.Labels
	if newEndpoints.Annotations == nil {
		newEndpoints.Annotations = make(map[string]string)
	}
	if len(serializedPodHostNames) == 0 {
		delete(newEndpoints.Annotations, endpoints.PodHostnamesAnnotation)
	} else {
		newEndpoints.Annotations[endpoints.PodHostnamesAnnotation] = serializedPodHostNames
	}

	glog.V(4).Infof("Update endpoints for %v/%v, ready: %d not ready: %d", service.Namespace, service.Name, readyEps, notReadyEps)
	createEndpoints := len(currentEndpoints.ResourceVersion) == 0
	if createEndpoints {
		// No previous endpoints, create them
		_, err = e.client.Core().Endpoints(service.Namespace).Create(newEndpoints)
	} else {
		// Pre-existing
		_, err = e.client.Core().Endpoints(service.Namespace).Update(newEndpoints)
	}
	if err != nil {
		if createEndpoints && errors.IsForbidden(err) {
			// A request is forbidden primarily for two reasons:
			// 1. namespace is terminating, endpoint creation is not allowed by default.
			// 2. policy is misconfigured, in which case no service would function anywhere.
			// Given the frequency of 1, we log at a lower level.
			glog.V(5).Infof("Forbidden from creating endpoints: %v", err)
		}
		return err
	}
	return nil
}

func (e *EndpointController) syncService(key string) {
	startTime := time.Now()
	defer func() {
		glog.V(4).Infof("Finished syncing service %q endpoints. (%v)", key, time.Now().Sub(startTime))
	}()
	obj, exists, err := e.serviceStore.Store.GetByKey(key)
	if err != nil || !exists {
		// Delete the corresponding endpoint, as the service has been deleted.
		// TODO: Please note that this will delete an endpoint when a
		// service is deleted. However, if we're down at the time when
		// the service is deleted, we will miss that deletion, so this
		// doesn't completely solve the problem. See #6877.
		namespace, name, err := cache.SplitMetaNamespaceKey(key)
		if err != nil {
			glog.Errorf("Need to delete endpoint with key %q, but couldn't understand the key: %v", key, err)
			// Don't retry, as the key isn't going to magically become understandable.
			return
		}
		err = e.client.Endpoints(namespace).Delete(name)
		if err != nil && !errors.IsNotFound(err) {
			glog.Errorf("Error deleting endpoint %q: %v", key, err)
			e.queue.Add(key) // Retry
		}
		return
	}

	service := obj.(*api.Service)
	if service.Spec.Selector == nil {
		// services without a selector receive no endpoints from this controller;
		// these services will receive the endpoints that are created out-of-band via the REST API.
		return
	}

	glog.V(5).Infof("About to update endpoints for service %q", key)
	pods, err := e.podStore.Pods(service.Namespace).List(labels.Set(service.Spec.Selector).AsSelector())
	if err != nil {
		// Since we're getting stuff from a local cache, it is
		// basically impossible to get this error.
		glog.Errorf("Error syncing service %q: %v", key, err)
		e.queue.Add(key) // Retry
		return
	}

	subsets := []api.EndpointSubset{}
	for i := range pods.Items {
		pod := &pods.Items[i]

		for i := range service.Spec.Ports {
			servicePort := &service.Spec.Ports[i]

			portName := servicePort.Name
			portProto := servicePort.Protocol
			portNum, err := findPort(pod, servicePort)
			if err != nil {
				glog.V(4).Infof("Failed to find port for service %s/%s: %v", service.Namespace, service.Name, err)
				continue
			}
			if len(pod.Status.PodIP) == 0 {
				glog.V(5).Infof("Failed to find an IP for pod %s/%s", pod.Namespace, pod.Name)
				continue
			}
			if pod.DeletionTimestamp != nil {
				glog.V(5).Infof("Pod is being deleted %s/%s", pod.Namespace, pod.Name)
				continue
			}

			epp := api.EndpointPort{Name: portName, Port: portNum, Protocol: portProto}
			epa := api.EndpointAddress{IP: pod.Status.PodIP, TargetRef: &api.ObjectReference{
				Kind:            "Pod",
				Namespace:       pod.ObjectMeta.Namespace,
				Name:            pod.ObjectMeta.Name,
				UID:             pod.ObjectMeta.UID,
				ResourceVersion: pod.ObjectMeta.ResourceVersion,
			}}
			if api.IsPodReady(pod) {
				subsets = append(subsets, api.EndpointSubset{
					Addresses: []api.EndpointAddress{epa},
					Ports:     []api.EndpointPort{epp},
				})
			} else {
				glog.V(5).Infof("Pod is out of service: %v/%v", pod.Namespace, pod.Name)
				subsets = append(subsets, api.EndpointSubset{
					NotReadyAddresses: []api.EndpointAddress{epa},
					Ports:             []api.EndpointPort{epp},
				})
			}
		}
	}
	subsets = endpoints.RepackSubsets(subsets)

	// See if there's actually an update here.
	currentEndpoints, err := e.client.Endpoints(service.Namespace).Get(service.Name)
	if err != nil {
		if errors.IsNotFound(err) {
			currentEndpoints = &api.Endpoints{
				ObjectMeta: api.ObjectMeta{
					Name:   service.Name,
					Labels: service.Labels,
				},
			}
//.........这里部分代码省略.........

// HACK(sttts): add annotations to the endpoint about the respective container ports
func (e *endpointController) syncService(key string) error {
	startTime := time.Now()
	defer func() {
		glog.V(4).Infof("Finished syncing service %q endpoints. (%v)", key, time.Now().Sub(startTime))
	}()
	obj, exists, err := e.serviceStore.Store.GetByKey(key)
	if err != nil || !exists {
		// Delete the corresponding endpoint, as the service has been deleted.
		// TODO: Please note that this will delete an endpoint when a
		// service is deleted. However, if we're down at the time when
		// the service is deleted, we will miss that deletion, so this
		// doesn't completely solve the problem. See #6877.
		namespace, name, err := cache.SplitMetaNamespaceKey(key)
		if err != nil {
			utilruntime.HandleError(fmt.Errorf("Need to delete endpoint with key %q, but couldn't understand the key: %v", key, err))
			// Don't retry, as the key isn't going to magically become understandable.
			return nil
		}
		err = e.client.Endpoints(namespace).Delete(name, nil)
		if err != nil && !errors.IsNotFound(err) {
			utilruntime.HandleError(fmt.Errorf("Error deleting endpoint %q: %v", key, err))
			return err
		}
		return nil
	}

	service := obj.(*api.Service)
	if service.Spec.Selector == nil {
		// services without a selector receive no endpoints from this controller;
		// these services will receive the endpoints that are created out-of-band via the REST API.
		return nil
	}

	glog.V(5).Infof("About to update endpoints for service %q", key)
	pods, err := e.podStore.Pods(service.Namespace).List(labels.Set(service.Spec.Selector).AsSelector())
	if err != nil {
		// Since we're getting stuff from a local cache, it is
		// basically impossible to get this error.
		utilruntime.HandleError(fmt.Errorf("Error syncing service %q: %v", key, err))
		return err
	}

	subsets := []api.EndpointSubset{}
	containerPortAnnotations := map[string]string{} // by <HostIP>:<Port>
	for i := range pods {
		// TODO: Do we need to copy here?
		pod := &(*pods[i])

		for i := range service.Spec.Ports {
			servicePort := &service.Spec.Ports[i]

			portName := servicePort.Name
			portProto := servicePort.Protocol
			portNum, containerPort, err := findPort(pod, servicePort)
			if err != nil {
				glog.V(4).Infof("Failed to find port for service %s/%s: %v", service.Namespace, service.Name, err)
				continue
			}
			// HACK(jdef): use HostIP instead of pod.CurrentState.PodIP for generic mesos compat
			if len(pod.Status.HostIP) == 0 {
				glog.V(4).Infof("Failed to find a host IP for pod %s/%s", pod.Namespace, pod.Name)
				continue
			}
			if pod.DeletionTimestamp != nil {
				glog.V(5).Infof("Pod is being deleted %s/%s", pod.Namespace, pod.Name)
				continue
			}

			if !api.IsPodReady(pod) {
				glog.V(5).Infof("Pod is out of service: %v/%v", pod.Namespace, pod.Name)
				continue
			}

			// HACK(jdef): use HostIP instead of pod.CurrentState.PodIP for generic mesos compat
			epp := api.EndpointPort{Name: portName, Port: int32(portNum), Protocol: portProto}
			epa := api.EndpointAddress{IP: pod.Status.HostIP, TargetRef: &api.ObjectReference{
				Kind:            "Pod",
				Namespace:       pod.ObjectMeta.Namespace,
				Name:            pod.ObjectMeta.Name,
				UID:             pod.ObjectMeta.UID,
				ResourceVersion: pod.ObjectMeta.ResourceVersion,
			}}
			subsets = append(subsets, api.EndpointSubset{Addresses: []api.EndpointAddress{epa}, Ports: []api.EndpointPort{epp}})
			containerPortAnnotations[fmt.Sprintf(meta.ContainerPortKeyFormat, portProto, pod.Status.HostIP, portNum)] = strconv.Itoa(containerPort)
		}
	}
	subsets = endpoints.RepackSubsets(subsets)

	// See if there's actually an update here.
	currentEndpoints, err := e.client.Endpoints(service.Namespace).Get(service.Name)
	if err != nil {
		if errors.IsNotFound(err) {
			currentEndpoints = &api.Endpoints{
				ObjectMeta: api.ObjectMeta{
					Name:   service.Name,
					Labels: service.Labels,
				},
			}
		} else {
//.........这里部分代码省略.........

// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
func (endpointsStrategy) PrepareForUpdate(obj, old runtime.Object) {
	newEndpoints := obj.(*api.Endpoints)
	_ = old.(*api.Endpoints)
	newEndpoints.Subsets = endptspkg.RepackSubsets(newEndpoints.Subsets)
}

// PrepareForCreate clears fields that are not allowed to be set by end users on creation.
func (endpointsStrategy) PrepareForCreate(obj runtime.Object) {
	endpoints := obj.(*api.Endpoints)
	endpoints.Subsets = endptspkg.RepackSubsets(endpoints.Subsets)
}

// ReconcileEndpoints lists keys in a special etcd directory.
// Each key is expected to have a TTL of R+n, where R is the refresh interval
// at which this function is called, and n is some small value.  If an
// apiserver goes down, it will fail to refresh its key's TTL and the key will
// expire. ReconcileEndpoints will notice that the endpoints object is
// different from the directory listing, and update the endpoints object
// accordingly.
func (r *leaseEndpointReconciler) ReconcileEndpoints(serviceName string, ip net.IP, endpointPorts []api.EndpointPort, reconcilePorts bool) error {
	ctx := api.NewDefaultContext()

	// Refresh the TTL on our key, independently of whether any error or
	// update conflict happens below. This makes sure that at least some of
	// the masters will add our endpoint.
	if err := r.masterLeases.UpdateLease(ip.String()); err != nil {
		return err
	}

	// Retrieve the current list of endpoints...
	e, err := r.endpointRegistry.GetEndpoints(ctx, serviceName)
	if err != nil {
		if !errors.IsNotFound(err) {
			return err
		}

		e = &api.Endpoints{
			ObjectMeta: api.ObjectMeta{
				Name:      serviceName,
				Namespace: api.NamespaceDefault,
			},
		}
	}

	// ... and the list of master IP keys from etcd
	masterIPs, err := r.masterLeases.ListLeases()
	if err != nil {
		return err
	}

	// Since we just refreshed our own key, assume that zero endpoints
	// returned from storage indicates an issue or invalid state, and thus do
	// not update the endpoints list based on the result.
	if len(masterIPs) == 0 {
		return fmt.Errorf("no master IPs were listed in storage, refusing to erase all endpoints for the kubernetes service")
	}

	// Next, we compare the current list of endpoints with the list of master IP keys
	formatCorrect, ipCorrect, portsCorrect := checkEndpointSubsetFormatWithLease(e, masterIPs, endpointPorts, reconcilePorts)
	if formatCorrect && ipCorrect && portsCorrect {
		return nil
	}

	if !formatCorrect {
		// Something is egregiously wrong, just re-make the endpoints record.
		e.Subsets = []api.EndpointSubset{{
			Addresses: []api.EndpointAddress{},
			Ports:     endpointPorts,
		}}
	}

	if !formatCorrect || !ipCorrect {
		// repopulate the addresses according to the expected IPs from etcd
		e.Subsets[0].Addresses = make([]api.EndpointAddress, len(masterIPs))
		for ind, ip := range masterIPs {
			e.Subsets[0].Addresses[ind] = api.EndpointAddress{IP: ip}
		}

		// Lexicographic order is retained by this step.
		e.Subsets = endpoints.RepackSubsets(e.Subsets)
	}

	if !portsCorrect {
		// Reset ports.
		e.Subsets[0].Ports = endpointPorts
	}

	glog.Warningf("Resetting endpoints for master service %q to %v", serviceName, masterIPs)
	return r.endpointRegistry.UpdateEndpoints(ctx, e)
}