Fix part of #9382

pkg/cloudprovider/servicecontroller/servicecontroller.go

@@ -30,7 +30,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/record"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/golang/glog"
@@ -75,6 +74,7 @@ type ServiceController struct {
 	cache            *serviceCache
 	eventBroadcaster record.EventBroadcaster
 	eventRecorder    record.EventRecorder
+	nodeLister       cache.StoreToNodeLister
 }
 
 // New returns a new service controller to keep cloud provider service resources
@@ -91,6 +91,9 @@ func New(cloud cloudprovider.Interface, kubeClient client.Interface, clusterName
 		cache:            &serviceCache{serviceMap: make(map[string]*cachedService)},
 		eventBroadcaster: broadcaster,
 		eventRecorder:    recorder,
+		nodeLister: cache.StoreToNodeLister{
+			Store: cache.NewStore(cache.MetaNamespaceKeyFunc),
+		},
 	}
 }
 
@@ -99,6 +102,9 @@ func New(cloud cloudprovider.Interface, kubeClient client.Interface, clusterName
 // load balancers created and deleted appropriately.
 // nodeSyncPeriod controls how often we check the cluster's nodes to determine
 // if external load balancers need to be updated to point to a new set.
+//
+// It's an error to call Run() more than once for a given ServiceController
+// object.
 func (s *ServiceController) Run(nodeSyncPeriod time.Duration) error {
 	if err := s.init(); err != nil {
 		return err
@@ -113,19 +119,27 @@ func (s *ServiceController) Run(nodeSyncPeriod time.Duration) error {
 
 	// Get the currently existing set of services and then all future creates
 	// and updates of services.
-	// No delta compressor is needed for the DeltaFIFO queue because we only ever
+	// A delta compressor is needed for the DeltaFIFO queue because we only ever
 	// care about the most recent state.
-	serviceQueue := cache.NewDeltaFIFO(cache.MetaNamespaceKeyFunc, nil, s.cache)
+	serviceQueue := cache.NewDeltaFIFO(
+		cache.MetaNamespaceKeyFunc,
+		cache.DeltaCompressorFunc(func(d cache.Deltas) cache.Deltas {
+			if len(d) == 0 {
+				return d
+			}
+			return cache.Deltas{*d.Newest()}
+		}),
+		s.cache,
+	)
 	lw := cache.NewListWatchFromClient(s.kubeClient.(*client.Client), "services", api.NamespaceAll, fields.Everything())
 	cache.NewReflector(lw, &api.Service{}, serviceQueue, 0).Run()
 	for i := 0; i < workerGoroutines; i++ {
 		go s.watchServices(serviceQueue)
 	}
 
-	nodeLister := &cache.StoreToNodeLister{cache.NewStore(cache.MetaNamespaceKeyFunc)}
 	nodeLW := cache.NewListWatchFromClient(s.kubeClient.(*client.Client), "nodes", api.NamespaceAll, fields.Everything())
-	cache.NewReflector(nodeLW, &api.Node{}, nodeLister.Store, 0).Run()
-	go s.nodeSyncLoop(nodeLister, nodeSyncPeriod)
+	cache.NewReflector(nodeLW, &api.Node{}, s.nodeLister.Store, 0).Run()
+	go s.nodeSyncLoop(nodeSyncPeriod)
 	return nil
 }
 
@@ -342,7 +356,7 @@ func (s *ServiceController) createExternalLoadBalancer(service *api.Service) err
 	if err != nil {
 		return err
 	}
-	nodes, err := s.kubeClient.Nodes().List(labels.Everything(), fields.Everything())
+	nodes, err := s.nodeLister.List()
 	if err != nil {
 		return err
 	}
@@ -352,7 +366,7 @@ func (s *ServiceController) createExternalLoadBalancer(service *api.Service) err
 			// TODO: Make this actually work for multiple IPs by using different
 			// names for each. For now, we'll just create the first and break.
 			status, err := s.balancer.CreateTCPLoadBalancer(name, s.zone.Region, net.ParseIP(publicIP),
-				ports, hostsFromNodeList(nodes), service.Spec.SessionAffinity)
+				ports, hostsFromNodeList(&nodes), service.Spec.SessionAffinity)
 			if err != nil {
 				return err
 			} else {
@@ -362,7 +376,7 @@ func (s *ServiceController) createExternalLoadBalancer(service *api.Service) err
 		}
 	} else {
 		status, err := s.balancer.CreateTCPLoadBalancer(name, s.zone.Region, nil,
-			ports, hostsFromNodeList(nodes), service.Spec.SessionAffinity)
+			ports, hostsFromNodeList(&nodes), service.Spec.SessionAffinity)
 		if err != nil {
 			return err
 		} else {
@@ -570,7 +584,7 @@ func hostsFromNodeList(list *api.NodeList) []string {
 
 // nodeSyncLoop handles updating the hosts pointed to by all external load
 // balancers whenever the set of nodes in the cluster changes.
-func (s *ServiceController) nodeSyncLoop(nodeLister *cache.StoreToNodeLister, period time.Duration) {
+func (s *ServiceController) nodeSyncLoop(period time.Duration) {
 	var prevHosts []string
 	var servicesToUpdate []*cachedService
 	// TODO: Eliminate the unneeded now variable once we stop compiling in go1.3.
@@ -578,7 +592,7 @@ func (s *ServiceController) nodeSyncLoop(nodeLister *cache.StoreToNodeLister, pe
 	// something to compile, and gofmt1.4 complains about using `_ = range`.
 	for now := range time.Tick(period) {
 		_ = now
-		nodes, err := nodeLister.List()
+		nodes, err := s.nodeLister.List()
 		if err != nil {
 			glog.Errorf("Failed to retrieve current set of nodes from node lister: %v", err)
 			continue