Listing pods only once when getting pods for RS in deployment

pkg/controller/deployment/deployment_controller.go

@@ -772,18 +772,21 @@ func (dc *DeploymentController) rsAndPodsWithHashKeySynced(deployment *extension
 		}
 		syncedRSList = append(syncedRSList, *syncedRS)
 	}
-	syncedPodList, err := deploymentutil.ListPods(deployment,
+	syncedPodList, err := dc.listPods(deployment)
-		func(namespace string, options api.ListOptions) (*api.PodList, error) {
-			podList, err := dc.podStore.Pods(namespace).List(options.LabelSelector)
-			return &podList, err
-		})
-
 	if err != nil {
 		return nil, nil, err
 	}
 	return syncedRSList, syncedPodList, nil
 }
 
+func (dc *DeploymentController) listPods(deployment *extensions.Deployment) (*api.PodList, error) {
+	return deploymentutil.ListPods(deployment,
+		func(namespace string, options api.ListOptions) (*api.PodList, error) {
+			podList, err := dc.podStore.Pods(namespace).List(options.LabelSelector)
+			return &podList, err
+		})
+}
+
 // addHashKeyToRSAndPods adds pod-template-hash information to the given rs, if it's not already there, with the following steps:
 // 1. Add hash label to the rs's pod template, and make sure the controller sees this update so that no orphaned pods will be created
 // 2. Add hash label to all pods this rs owns, wait until replicaset controller reports rs.Status.FullyLabeledReplicas equal to the desired number of replicas
@@ -977,6 +980,14 @@ func (dc *DeploymentController) reconcileNewReplicaSet(allRSs []*extensions.Repl
 	return scaled, err
 }
 
+func (dc *DeploymentController) getAvailablePodsForReplicaSets(deployment *extensions.Deployment, rss []*extensions.ReplicaSet, minReadySeconds int32) (int32, error) {
+	podList, err := dc.listPods(deployment)
+	if err != nil {
+		return 0, err
+	}
+	return deploymentutil.CountAvailablePodsForReplicaSets(podList, rss, minReadySeconds)
+}
+
 func (dc *DeploymentController) reconcileOldReplicaSets(allRSs []*extensions.ReplicaSet, oldRSs []*extensions.ReplicaSet, newRS *extensions.ReplicaSet, deployment *extensions.Deployment) (bool, error) {
 	oldPodsCount := deploymentutil.GetReplicaCountForReplicaSets(oldRSs)
 	if oldPodsCount == 0 {
@@ -986,7 +997,8 @@ func (dc *DeploymentController) reconcileOldReplicaSets(allRSs []*extensions.Rep
 
 	minReadySeconds := deployment.Spec.MinReadySeconds
 	allPodsCount := deploymentutil.GetReplicaCountForReplicaSets(allRSs)
-	newRSAvailablePodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, []*extensions.ReplicaSet{newRS}, minReadySeconds)
+	// TODO: use dc.getAvailablePodsForReplicaSets instead
+	newRSAvailablePodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, deployment, []*extensions.ReplicaSet{newRS}, minReadySeconds)
 	if err != nil {
 		return false, fmt.Errorf("could not find available pods: %v", err)
 	}
@@ -1068,7 +1080,8 @@ func (dc *DeploymentController) cleanupUnhealthyReplicas(oldRSs []*extensions.Re
 			// cannot scale down this replica set.
 			continue
 		}
-		readyPodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, []*extensions.ReplicaSet{targetRS}, 0)
+		// TODO: use dc.getAvailablePodsForReplicaSets instead
+		readyPodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, deployment, []*extensions.ReplicaSet{targetRS}, 0)
 		if err != nil {
 			return nil, totalScaledDown, fmt.Errorf("could not find available pods: %v", err)
 		}
@@ -1104,7 +1117,8 @@ func (dc *DeploymentController) scaleDownOldReplicaSetsForRollingUpdate(allRSs [
 	minAvailable := deployment.Spec.Replicas - maxUnavailable
 	minReadySeconds := deployment.Spec.MinReadySeconds
 	// Find the number of ready pods.
-	availablePodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, allRSs, minReadySeconds)
+	// TODO: use dc.getAvailablePodsForReplicaSets instead
+	availablePodCount, err := deploymentutil.GetAvailablePodsForReplicaSets(dc.client, deployment, allRSs, minReadySeconds)
 	if err != nil {
 		return 0, fmt.Errorf("could not find available pods: %v", err)
 	}
@@ -1220,7 +1234,7 @@ func (dc *DeploymentController) calculateStatus(allRSs []*extensions.ReplicaSet,
 	totalActualReplicas = deploymentutil.GetActualReplicaCountForReplicaSets(allRSs)
 	updatedReplicas = deploymentutil.GetActualReplicaCountForReplicaSets([]*extensions.ReplicaSet{newRS})
 	minReadySeconds := deployment.Spec.MinReadySeconds
-	availableReplicas, err = deploymentutil.GetAvailablePodsForReplicaSets(dc.client, allRSs, minReadySeconds)
+	availableReplicas, err = dc.getAvailablePodsForReplicaSets(deployment, allRSs, minReadySeconds)
 	if err != nil {
 		err = fmt.Errorf("failed to count available pods: %v", err)
 		return

pkg/controller/deployment/deployment_controller_test.go

@@ -54,13 +54,14 @@ func newRSWithStatus(name string, specReplicas, statusReplicas int, selector map
 	return rs
 }
 
-func deployment(name string, replicas int, maxSurge, maxUnavailable intstr.IntOrString) exp.Deployment {
+func deployment(name string, replicas int, maxSurge, maxUnavailable intstr.IntOrString, selector map[string]string) exp.Deployment {
 	return exp.Deployment{
 		ObjectMeta: api.ObjectMeta{
 			Name: name,
 		},
 		Spec: exp.DeploymentSpec{
 			Replicas: int32(replicas),
+			Selector: &unversioned.LabelSelector{MatchLabels: selector},
 			Strategy: exp.DeploymentStrategy{
 				Type: exp.RollingUpdateDeploymentStrategyType,
 				RollingUpdate: &exp.RollingUpdateDeployment{
@@ -190,7 +191,7 @@ func TestDeploymentController_reconcileNewReplicaSet(t *testing.T) {
 		newRS := rs("foo-v2", test.newReplicas, nil)
 		oldRS := rs("foo-v2", test.oldReplicas, nil)
 		allRSs := []*exp.ReplicaSet{newRS, oldRS}
-		deployment := deployment("foo", test.deploymentReplicas, test.maxSurge, intstr.FromInt(0))
+		deployment := deployment("foo", test.deploymentReplicas, test.maxSurge, intstr.FromInt(0), nil)
 		fake := fake.Clientset{}
 		controller := &DeploymentController{
 			client:        &fake,
@@ -293,7 +294,7 @@ func TestDeploymentController_reconcileOldReplicaSets(t *testing.T) {
 		oldRSs := []*exp.ReplicaSet{oldRS}
 		allRSs := []*exp.ReplicaSet{oldRS, newRS}
 
-		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable)
+		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable, newSelector)
 		fakeClientset := fake.Clientset{}
 		fakeClientset.AddReactor("list", "pods", func(action core.Action) (handled bool, ret runtime.Object, err error) {
 			switch action.(type) {
@@ -430,7 +431,7 @@ func TestDeploymentController_cleanupUnhealthyReplicas(t *testing.T) {
 		t.Logf("executing scenario %d", i)
 		oldRS := rs("foo-v2", test.oldReplicas, nil)
 		oldRSs := []*exp.ReplicaSet{oldRS}
-		deployment := deployment("foo", 10, intstr.FromInt(2), intstr.FromInt(2))
+		deployment := deployment("foo", 10, intstr.FromInt(2), intstr.FromInt(2), nil)
 		fakeClientset := fake.Clientset{}
 		fakeClientset.AddReactor("list", "pods", func(action core.Action) (handled bool, ret runtime.Object, err error) {
 			switch action.(type) {
@@ -540,7 +541,7 @@ func TestDeploymentController_scaleDownOldReplicaSetsForRollingUpdate(t *testing
 		oldRS := rs("foo-v2", test.oldReplicas, nil)
 		allRSs := []*exp.ReplicaSet{oldRS}
 		oldRSs := []*exp.ReplicaSet{oldRS}
-		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable)
+		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable, map[string]string{"foo": "bar"})
 		fakeClientset := fake.Clientset{}
 		fakeClientset.AddReactor("list", "pods", func(action core.Action) (handled bool, ret runtime.Object, err error) {
 			switch action.(type) {
@@ -783,12 +784,10 @@ func TestSyncDeploymentCreatesReplicaSet(t *testing.T) {
 	// then is updated to 1 replica
 	rs := newReplicaSet(d, "deploymentrs-4186632231", 0)
 	updatedRS := newReplicaSet(d, "deploymentrs-4186632231", 1)
-	opt := newListOptions()
 
 	f.expectCreateRSAction(rs)
 	f.expectUpdateDeploymentAction(d)
 	f.expectUpdateRSAction(updatedRS)
-	f.expectListPodAction(rs.Namespace, opt)
 	f.expectUpdateDeploymentAction(d)
 
 	f.run(getKey(d, t))

pkg/util/deployment/deployment.go

@@ -34,6 +34,7 @@ import (
 	intstrutil "k8s.io/kubernetes/pkg/util/intstr"
 	labelsutil "k8s.io/kubernetes/pkg/util/labels"
 	podutil "k8s.io/kubernetes/pkg/util/pod"
+	rsutil "k8s.io/kubernetes/pkg/util/replicaset"
 	"k8s.io/kubernetes/pkg/util/wait"
 )
 
@@ -314,23 +315,42 @@ func GetActualReplicaCountForReplicaSets(replicaSets []*extensions.ReplicaSet) i
 	return totalReplicaCount
 }
 
-// Returns the number of available pods corresponding to the given replica sets.
+// GetAvailablePodsForReplicaSets returns the number of available pods (listed from clientset) corresponding to the given replica sets.
-func GetAvailablePodsForReplicaSets(c clientset.Interface, rss []*extensions.ReplicaSet, minReadySeconds int32) (int32, error) {
+func GetAvailablePodsForReplicaSets(c clientset.Interface, deployment *extensions.Deployment, rss []*extensions.ReplicaSet, minReadySeconds int32) (int32, error) {
-	allPods, err := GetPodsForReplicaSets(c, rss)
+	podList, err := listPods(deployment, c)
 	if err != nil {
 		return 0, err
 	}
-	return getReadyPodsCount(allPods, minReadySeconds), nil
+	return CountAvailablePodsForReplicaSets(podList, rss, minReadySeconds)
 }
 
-func getReadyPodsCount(pods []api.Pod, minReadySeconds int32) int32 {
+// CountAvailablePodsForReplicaSets returns the number of available pods corresponding to the given pod list and replica sets.
-	readyPodCount := int32(0)
+// Note that the input pod list should be the pods targeted by the deployment of input replica sets.
+func CountAvailablePodsForReplicaSets(podList *api.PodList, rss []*extensions.ReplicaSet, minReadySeconds int32) (int32, error) {
+	rsPods, err := filterPodsMatchingReplicaSets(rss, podList)
+	if err != nil {
+		return 0, err
+	}
+	return countAvailablePods(rsPods, minReadySeconds), nil
+}
+
+// GetAvailablePodsForDeployment returns the number of available pods (listed from clientset) corresponding to the given deployment.
+func GetAvailablePodsForDeployment(c clientset.Interface, deployment *extensions.Deployment, minReadySeconds int32) (int32, error) {
+	podList, err := listPods(deployment, c)
+	if err != nil {
+		return 0, err
+	}
+	return countAvailablePods(podList.Items, minReadySeconds), nil
+}
+
+func countAvailablePods(pods []api.Pod, minReadySeconds int32) int32 {
+	availablePodCount := int32(0)
 	for _, pod := range pods {
 		if IsPodAvailable(&pod, minReadySeconds) {
-			readyPodCount++
+			availablePodCount++
 		}
 	}
-	return readyPodCount
+	return availablePodCount
 }
 
 func IsPodAvailable(pod *api.Pod, minReadySeconds int32) bool {
@@ -354,29 +374,20 @@ func IsPodAvailable(pod *api.Pod, minReadySeconds int32) bool {
 	return false
 }
 
-func GetPodsForReplicaSets(c clientset.Interface, replicaSets []*extensions.ReplicaSet) ([]api.Pod, error) {
+// filterPodsMatchingReplicaSets filters the given pod list and only return the ones targeted by the input replicasets
-	allPods := map[string]api.Pod{}
+func filterPodsMatchingReplicaSets(replicaSets []*extensions.ReplicaSet, podList *api.PodList) ([]api.Pod, error) {
+	rsPods := []api.Pod{}
 	for _, rs := range replicaSets {
-		if rs != nil {
+		matchingFunc, err := rsutil.MatchingPodsFunc(rs)
-			selector, err := unversioned.LabelSelectorAsSelector(rs.Spec.Selector)
+		if err != nil {
-			if err != nil {
+			return nil, err
-				return nil, fmt.Errorf("invalid label selector: %v", err)
-			}
-			options := api.ListOptions{LabelSelector: selector}
-			podList, err := c.Core().Pods(rs.ObjectMeta.Namespace).List(options)
-			if err != nil {
-				return nil, fmt.Errorf("error listing pods: %v", err)
-			}
-			for _, pod := range podList.Items {
-				allPods[pod.Name] = pod
-			}
 		}
+		if matchingFunc == nil {
+			continue
+		}
+		rsPods = append(rsPods, podutil.Filter(podList, matchingFunc)...)
 	}
-	requiredPods := []api.Pod{}
+	return rsPods, nil
-	for _, pod := range allPods {
-		requiredPods = append(requiredPods, pod)
-	}
-	return requiredPods, nil
 }
 
 // Revision returns the revision number of the input replica set

pkg/util/deployment/deployment_test.go

@@ -96,7 +96,7 @@ func newPod(now time.Time, ready bool, beforeSec int) api.Pod {
 	}
 }
 
-func TestGetReadyPodsCount(t *testing.T) {
+func TestCountAvailablePods(t *testing.T) {
 	now := time.Now()
 	tests := []struct {
 		pods            []api.Pod
@@ -124,7 +124,7 @@ func TestGetReadyPodsCount(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		if count := getReadyPodsCount(test.pods, int32(test.minReadySeconds)); int(count) != test.expected {
+		if count := countAvailablePods(test.pods, int32(test.minReadySeconds)); int(count) != test.expected {
 			t.Errorf("Pods = %#v, minReadySeconds = %d, expected %d, got %d", test.pods, test.minReadySeconds, test.expected, count)
 		}
 	}

pkg/util/pod/pod.go

@@ -87,3 +87,14 @@ func UpdatePodWithRetries(podClient unversionedcore.PodInterface, pod *api.Pod,
 	// if the error is nil and podUpdated is true, the returned pod contains the applied update.
 	return pod, podUpdated, err
 }
+
+// Filter uses the input function f to filter the given pod list, and return the filtered pods
+func Filter(podList *api.PodList, f func(api.Pod) bool) []api.Pod {
+	pods := make([]api.Pod, 0)
+	for _, p := range podList.Items {
+		if f(p) {
+			pods = append(pods, p)
+		}
+	}
+	return pods
+}

pkg/util/replicaset/replicaset.go

@@ -23,8 +23,10 @@ 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"
 	unversionedextensions "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/extensions/unversioned"
+	"k8s.io/kubernetes/pkg/labels"
 	errorsutil "k8s.io/kubernetes/pkg/util/errors"
 	labelsutil "k8s.io/kubernetes/pkg/util/labels"
 	podutil "k8s.io/kubernetes/pkg/util/pod"
@@ -91,3 +93,18 @@ func GetPodTemplateSpecHash(rs extensions.ReplicaSet) string {
 		Spec:       rs.Spec.Template.Spec,
 	}))
 }
+
+// MatchingPodsFunc returns a filter function for pods with matching labels
+func MatchingPodsFunc(rs *extensions.ReplicaSet) (func(api.Pod) bool, error) {
+	if rs == nil {
+		return nil, nil
+	}
+	selector, err := unversioned.LabelSelectorAsSelector(rs.Spec.Selector)
+	if err != nil {
+		return nil, fmt.Errorf("invalid label selector: %v", err)
+	}
+	return func(pod api.Pod) bool {
+		podLabelsSelector := labels.Set(pod.ObjectMeta.Labels)
+		return selector.Matches(podLabelsSelector)
+	}, nil
+}

test/e2e/framework/util.go

@@ -2886,18 +2886,18 @@ func WaitForDeploymentStatus(c clientset.Interface, ns, deploymentName string, d
 			}
 		}
 		totalCreated := deploymentutil.GetReplicaCountForReplicaSets(allRSs)
-		totalAvailable, err := deploymentutil.GetAvailablePodsForReplicaSets(c, allRSs, minReadySeconds)
+		totalAvailable, err := deploymentutil.GetAvailablePodsForDeployment(c, deployment, minReadySeconds)
 		if err != nil {
 			return false, err
 		}
 		if totalCreated > maxCreated {
 			logReplicaSetsOfDeployment(deployment, allOldRSs, newRS)
-			logPodsOfReplicaSets(c, allRSs, minReadySeconds)
+			logPodsOfDeployment(c, deployment, minReadySeconds)
 			return false, fmt.Errorf("total pods created: %d, more than the max allowed: %d", totalCreated, maxCreated)
 		}
 		if totalAvailable < minAvailable {
 			logReplicaSetsOfDeployment(deployment, allOldRSs, newRS)
-			logPodsOfReplicaSets(c, allRSs, minReadySeconds)
+			logPodsOfDeployment(c, deployment, minReadySeconds)
 			return false, fmt.Errorf("total pods available: %d, less than the min required: %d", totalAvailable, minAvailable)
 		}
 
@@ -2913,7 +2913,7 @@ func WaitForDeploymentStatus(c clientset.Interface, ns, deploymentName string, d
 
 	if err == wait.ErrWaitTimeout {
 		logReplicaSetsOfDeployment(deployment, allOldRSs, newRS)
-		logPodsOfReplicaSets(c, allRSs, minReadySeconds)
+		logPodsOfDeployment(c, deployment, minReadySeconds)
 	}
 	if err != nil {
 		return fmt.Errorf("error waiting for deployment %s status to match expectation: %v", deploymentName, err)
@@ -3062,10 +3062,17 @@ func WaitForObservedDeployment(c *clientset.Clientset, ns, deploymentName string
 	return deploymentutil.WaitForObservedDeployment(func() (*extensions.Deployment, error) { return c.Extensions().Deployments(ns).Get(deploymentName) }, desiredGeneration, Poll, 1*time.Minute)
 }
 
-func logPodsOfReplicaSets(c clientset.Interface, rss []*extensions.ReplicaSet, minReadySeconds int32) {
+func logPodsOfDeployment(c clientset.Interface, deployment *extensions.Deployment, minReadySeconds int32) {
-	allPods, err := deploymentutil.GetPodsForReplicaSets(c, rss)
+	podList, err := deploymentutil.ListPods(deployment,
+		func(namespace string, options api.ListOptions) (*api.PodList, error) {
+			return c.Core().Pods(namespace).List(options)
+		})
+	if err != nil {
+		Logf("Failed to list pods of deployment %s: %v", deployment.Name, err)
+		return
+	}
 	if err == nil {
-		for _, pod := range allPods {
+		for _, pod := range podList.Items {
 			availability := "not available"
 			if deploymentutil.IsPodAvailable(&pod, minReadySeconds) {
 				availability = "available"