Merge pull request kubernetes#84300 from klueska/upstream-cpu-manager-reconcile-on-container-state

Update logic in `CPUManager` `reconcileState()`

Author: k8s-ci-robot

pkg/kubelet/cm/cpumanager/cpu_manager.go

@@ -200,6 +200,8 @@ func (m *manager) Start(activePods ActivePodsFunc, sourcesReady config.SourcesRe
 	if m.policy.Name() == string(PolicyNone) {
 		return nil
 	}
+	// Periodically call m.reconcileState() to continue to keep the CPU sets of
+	// all pods in sync with and guaranteed CPUs handed out among them.
 	go wait.Until(func() { m.reconcileState() }, m.reconcilePeriod, wait.NeverStop)
 	return nil
 }
@@ -217,19 +219,24 @@ func (m *manager) AddContainer(p *v1.Pod, c *v1.Container, containerID string) e
 			}
 		}
 	}
+
+	// Call down into the policy to assign this container CPUs if required.
 	err := m.policyAddContainer(p, c, containerID)
 	if err != nil {
 		klog.Errorf("[cpumanager] AddContainer error: %v", err)
 		m.Unlock()
 		return err
 	}
+
+	// Get the CPUs just assigned to the container (or fall back to the default
+	// CPUSet if none were assigned).
 	cpus := m.state.GetCPUSetOrDefault(string(p.UID), c.Name)
 	m.Unlock()
 
 	if !cpus.IsEmpty() {
 		err = m.updateContainerCPUSet(containerID, cpus)
 		if err != nil {
-			klog.Errorf("[cpumanager] AddContainer error: %v", err)
+			klog.Errorf("[cpumanager] AddContainer error: error updating CPUSet for container (pod: %s, container: %s, container id: %s, err: %v)", p.Name, c.Name, containerID, err)
 			m.Lock()
 			err := m.policyRemoveContainerByID(containerID)
 			if err != nil {
@@ -353,43 +360,59 @@ func (m *manager) reconcileState() (success []reconciledContainer, failure []rec
 
 	m.removeStaleState()
 	for _, pod := range m.activePods() {
+		pstatus, ok := m.podStatusProvider.GetPodStatus(pod.UID)
+		if !ok {
+			klog.Warningf("[cpumanager] reconcileState: skipping pod; status not found (pod: %s)", pod.Name)
+			failure = append(failure, reconciledContainer{pod.Name, "", ""})
+			continue
+		}
+
 		allContainers := pod.Spec.InitContainers
 		allContainers = append(allContainers, pod.Spec.Containers...)
-		status, ok := m.podStatusProvider.GetPodStatus(pod.UID)
 		for _, container := range allContainers {
-			if !ok {
-				klog.Warningf("[cpumanager] reconcileState: skipping pod; status not found (pod: %s)", pod.Name)
+			containerID, err := findContainerIDByName(&pstatus, container.Name)
+			if err != nil {
+				klog.Warningf("[cpumanager] reconcileState: skipping container; ID not found in pod status (pod: %s, container: %s, error: %v)", pod.Name, container.Name, err)
 				failure = append(failure, reconciledContainer{pod.Name, container.Name, ""})
-				break
+				continue
 			}
 
-			containerID, err := findContainerIDByName(&status, container.Name)
+			cstatus, err := findContainerStatusByName(&pstatus, container.Name)
 			if err != nil {
-				klog.Warningf("[cpumanager] reconcileState: skipping container; ID not found in status (pod: %s, container: %s, error: %v)", pod.Name, container.Name, err)
+				klog.Warningf("[cpumanager] reconcileState: skipping container; container status not found in pod status (pod: %s, container: %s, error: %v)", pod.Name, container.Name, err)
 				failure = append(failure, reconciledContainer{pod.Name, container.Name, ""})
 				continue
 			}
 
-			// Check whether container is present in state, there may be 3 reasons why it's not present:
-			// - policy does not want to track the container
-			// - kubelet has just been restarted - and there is no previous state file
-			// - container has been removed from state by RemoveContainer call (DeletionTimestamp is set)
-			if _, ok := m.state.GetCPUSet(string(pod.UID), container.Name); !ok {
-				if status.Phase == v1.PodRunning && pod.DeletionTimestamp == nil {
-					klog.V(4).Infof("[cpumanager] reconcileState: container is not present in state - trying to add (pod: %s, container: %s, container id: %s)", pod.Name, container.Name, containerID)
-					err := m.AddContainer(pod, &container, containerID)
+			if cstatus.State.Waiting != nil ||
+				(cstatus.State.Waiting == nil && cstatus.State.Running == nil && cstatus.State.Terminated == nil) {
+				klog.Warningf("[cpumanager] reconcileState: skipping container; container still in the waiting state (pod: %s, container: %s, error: %v)", pod.Name, container.Name, err)
+				failure = append(failure, reconciledContainer{pod.Name, container.Name, ""})
+				continue
+			}
+
+			if cstatus.State.Terminated != nil {
+				// Since the container is terminated, we know it is safe to
+				// remove it without any reconciliation. Removing the container
+				// will also remove it from the `containerMap` so that this
+				// container will be skipped next time around the loop.
+				_, _, err := m.containerMap.GetContainerRef(containerID)
+				if err == nil {
+					klog.Warningf("[cpumanager] reconcileState: skipping container; already terminated (pod: %s, container id: %s)", pod.Name, containerID)
+					err := m.RemoveContainer(containerID)
 					if err != nil {
-						klog.Errorf("[cpumanager] reconcileState: failed to add container (pod: %s, container: %s, container id: %s, error: %v)", pod.Name, container.Name, containerID, err)
+						klog.Errorf("[cpumanager] reconcileState: failed to remove container (pod: %s, container id: %s, error: %v)", pod.Name, containerID, err)
 						failure = append(failure, reconciledContainer{pod.Name, container.Name, containerID})
-						continue
 					}
-				} else {
-					// if DeletionTimestamp is set, pod has already been removed from state
-					// skip the pod/container since it's not running and will be deleted soon
-					continue
 				}
+				continue
 			}
 
+			// Once we make it here we know we have a running container.
+			// Idempotently add it to the containerMap incase it is missing.
+			// This can happen after a kubelet restart, for example.
+			m.containerMap.Add(string(pod.UID), container.Name, containerID)
+
 			cset := m.state.GetCPUSetOrDefault(string(pod.UID), container.Name)
 			if cset.IsEmpty() {
 				// NOTE: This should not happen outside of tests.
@@ -427,6 +450,15 @@ func findContainerIDByName(status *v1.PodStatus, name string) (string, error) {
 	return "", fmt.Errorf("unable to find ID for container with name %v in pod status (it may not be running)", name)
 }
 
+func findContainerStatusByName(status *v1.PodStatus, name string) (*v1.ContainerStatus, error) {
+	for _, status := range append(status.InitContainerStatuses, status.ContainerStatuses...) {
+		if status.Name == name {
+			return &status, nil
+		}
+	}
+	return nil, fmt.Errorf("unable to find status for container with name %v in pod status (it may not be running)", name)
+}
+
 func (m *manager) updateContainerCPUSet(containerID string, cpus cpuset.CPUSet) error {
 	// TODO: Consider adding a `ResourceConfigForContainer` helper in
 	// helpers_linux.go similar to what exists for pods.

pkg/kubelet/cm/cpumanager/cpu_manager_test.go

@@ -702,6 +702,9 @@ func TestReconcileState(t *testing.T) {
 					{
 						Name:        "fakeContainerName",
 						ContainerID: "docker://fakeContainerID",
+						State: v1.ContainerState{
+							Running: &v1.ContainerStateRunning{},
+						},
 					},
 				},
 			},
@@ -738,6 +741,9 @@ func TestReconcileState(t *testing.T) {
 					{
 						Name:        "fakeContainerName",
 						ContainerID: "docker://fakeContainerID",
+						State: v1.ContainerState{
+							Running: &v1.ContainerStateRunning{},
+						},
 					},
 				},
 			},
@@ -753,7 +759,7 @@ func TestReconcileState(t *testing.T) {
 			expectFailedContainerName:    "",
 		},
 		{
-			description: "cpu manager reconclie - pod status not found",
+			description: "cpu manager reconcile - pod status not found",
 			activePods: []*v1.Pod{
 				{
 					ObjectMeta: metav1.ObjectMeta{
@@ -775,10 +781,10 @@ func TestReconcileState(t *testing.T) {
 			stDefaultCPUSet:              cpuset.NewCPUSet(),
 			updateErr:                    nil,
 			expectSucceededContainerName: "",
-			expectFailedContainerName:    "fakeContainerName",
+			expectFailedContainerName:    "",
 		},
 		{
-			description: "cpu manager reconclie - container id not found",
+			description: "cpu manager reconcile - container state not found",
 			activePods: []*v1.Pod{
 				{
 					ObjectMeta: metav1.ObjectMeta{
@@ -831,6 +837,9 @@ func TestReconcileState(t *testing.T) {
 					{
 						Name:        "fakeContainerName",
 						ContainerID: "docker://fakeContainerID",
+						State: v1.ContainerState{
+							Running: &v1.ContainerStateRunning{},
+						},
 					},
 				},
 			},
@@ -867,6 +876,9 @@ func TestReconcileState(t *testing.T) {
 					{
 						Name:        "fakeContainerName",
 						ContainerID: "docker://fakeContainerID",
+						State: v1.ContainerState{
+							Running: &v1.ContainerStateRunning{},
+						},
 					},
 				},
 			},