Merge pull request kubernetes#129504 from felipeagger/cleanup/ckpt-pod-alloc-state-mem

Cleanup Kubelet Checkpointing: Refactor state mem

Author: k8s-ci-robot

pkg/kubelet/status/fake_status_manager.go

@@ -93,6 +93,6 @@ func (m *fakeManager) SetPodResizeStatus(podUID types.UID, resizeStatus v1.PodRe
 // NewFakeManager creates empty/fake memory manager
 func NewFakeManager() Manager {
 	return &fakeManager{
-		state: state.NewStateMemory(),
+		state: state.NewStateMemory(state.PodResourceAllocation{}),
 	}
 }

pkg/kubelet/status/state/state.go

@@ -47,7 +47,6 @@ type Reader interface {
 
 type writer interface {
 	SetContainerResourceAllocation(podUID string, containerName string, alloc v1.ResourceRequirements) error
-	SetPodResourceAllocation(PodResourceAllocation) error
 	SetPodResizeStatus(podUID string, resizeStatus v1.PodResizeStatus)
 	Delete(podUID string, containerName string) error
 	ClearState() error

pkg/kubelet/status/state/state_checkpoint.go

@@ -42,46 +42,42 @@ func NewStateCheckpoint(stateDir, checkpointName string) (State, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize checkpoint manager for pod allocation tracking: %v", err)
 	}
+
+	praInfo, err := restoreState(checkpointManager, checkpointName)
+	if err != nil {
+		//lint:ignore ST1005 user-facing error message
+		return nil, fmt.Errorf("could not restore state from checkpoint: %w, please drain this node and delete pod allocation checkpoint file %q before restarting Kubelet",
+			err, path.Join(stateDir, checkpointName))
+	}
+
 	stateCheckpoint := &stateCheckpoint{
-		cache:             NewStateMemory(),
+		cache:             NewStateMemory(praInfo.AllocationEntries),
 		checkpointManager: checkpointManager,
 		checkpointName:    checkpointName,
 	}
-
-	if err := stateCheckpoint.restoreState(); err != nil {
-		//lint:ignore ST1005 user-facing error message
-		return nil, fmt.Errorf("could not restore state from checkpoint: %v, please drain this node and delete pod allocation checkpoint file %q before restarting Kubelet", err, path.Join(stateDir, checkpointName))
-	}
 	return stateCheckpoint, nil
 }
 
 // restores state from a checkpoint and creates it if it doesn't exist
-func (sc *stateCheckpoint) restoreState() error {
-	sc.mux.Lock()
-	defer sc.mux.Unlock()
+func restoreState(checkpointManager checkpointmanager.CheckpointManager, checkpointName string) (*PodResourceAllocationInfo, error) {
 	var err error
+	checkpoint := &Checkpoint{}
 
-	checkpoint, err := NewCheckpoint(nil)
-	if err != nil {
-		return fmt.Errorf("failed to create new checkpoint: %w", err)
-	}
-
-	if err = sc.checkpointManager.GetCheckpoint(sc.checkpointName, checkpoint); err != nil {
+	if err = checkpointManager.GetCheckpoint(checkpointName, checkpoint); err != nil {
 		if err == errors.ErrCheckpointNotFound {
-			return sc.storeState()
+			return &PodResourceAllocationInfo{
+				AllocationEntries: make(map[string]map[string]v1.ResourceRequirements),
+			}, nil
 		}
-		return err
+		return nil, err
 	}
+	klog.V(2).InfoS("State checkpoint: restored pod resource allocation state from checkpoint")
 	praInfo, err := checkpoint.GetPodResourceAllocationInfo()
 	if err != nil {
-		return fmt.Errorf("failed to get pod resource allocation info: %w", err)
-	}
-	err = sc.cache.SetPodResourceAllocation(praInfo.AllocationEntries)
-	if err != nil {
-		return fmt.Errorf("failed to set pod resource allocation: %w", err)
+		return nil, fmt.Errorf("failed to get pod resource allocation info: %w", err)
 	}
-	klog.V(2).InfoS("State checkpoint: restored pod resource allocation state from checkpoint")
-	return nil
+
+	return praInfo, nil
 }
 
 // saves state to a checkpoint, caller is responsible for locking
@@ -131,14 +127,6 @@ func (sc *stateCheckpoint) SetContainerResourceAllocation(podUID string, contain
 	return sc.storeState()
 }
 
-// SetPodResourceAllocation sets pod resource allocation
-func (sc *stateCheckpoint) SetPodResourceAllocation(a PodResourceAllocation) error {
-	sc.mux.Lock()
-	defer sc.mux.Unlock()
-	sc.cache.SetPodResourceAllocation(a)
-	return sc.storeState()
-}
-
 // SetPodResizeStatus sets the last resize decision for a pod
 func (sc *stateCheckpoint) SetPodResizeStatus(podUID string, resizeStatus v1.PodResizeStatus) {
 	sc.mux.Lock()
@@ -185,10 +173,6 @@ func (sc *noopStateCheckpoint) SetContainerResourceAllocation(_ string, _ string
 	return nil
 }
 
-func (sc *noopStateCheckpoint) SetPodResourceAllocation(_ PodResourceAllocation) error {
-	return nil
-}
-
 func (sc *noopStateCheckpoint) SetPodResizeStatus(_ string, _ v1.PodResizeStatus) {}
 
 func (sc *noopStateCheckpoint) Delete(_ string, _ string) error {

pkg/kubelet/status/state/state_checkpoint_test.go

@@ -32,7 +32,7 @@ const testCheckpoint = "pod_status_manager_state"
 
 func newTestStateCheckpoint(t *testing.T) *stateCheckpoint {
 	testingDir := getTestDir(t)
-	cache := NewStateMemory()
+	cache := NewStateMemory(PodResourceAllocation{})
 	checkpointManager, err := checkpointmanager.NewCheckpointManager(testingDir)
 	require.NoError(t, err, "failed to create checkpoint manager")
 	checkpointName := "pod_state_checkpoint"
@@ -110,8 +110,12 @@ func Test_stateCheckpoint_storeState(t *testing.T) {
 			originalSC, err := NewStateCheckpoint(testDir, testCheckpoint)
 			require.NoError(t, err)
 
-			err = originalSC.SetPodResourceAllocation(tt.args.podResourceAllocation)
-			require.NoError(t, err)
+			for podUID, containerAlloc := range tt.args.podResourceAllocation {
+				for containerName, alloc := range containerAlloc {
+					err = originalSC.SetContainerResourceAllocation(podUID, containerName, alloc)
+					require.NoError(t, err)
+				}
+			}
 
 			actual := originalSC.GetPodResourceAllocation()
 			verifyPodResourceAllocation(t, &tt.args.podResourceAllocation, &actual, "stored pod resource allocation is not equal to original pod resource allocation")
@@ -154,11 +158,15 @@ func Test_stateCheckpoint_formatUpgraded(t *testing.T) {
 	err = sc.checkpointManager.CreateCheckpoint(sc.checkpointName, checkpoint)
 	require.NoError(t, err, "failed to create old checkpoint")
 
-	err = sc.restoreState()
+	actualPodResourceAllocationInfo, err := restoreState(sc.checkpointManager, sc.checkpointName)
 	require.NoError(t, err, "failed to restore state")
 
-	actualPodResourceAllocationInfo := &PodResourceAllocationInfo{}
+	require.Equal(t, expectedPodResourceAllocationInfo, actualPodResourceAllocationInfo, "pod resource allocation info is not equal")
+
+	sc.cache = NewStateMemory(actualPodResourceAllocationInfo.AllocationEntries)
+
+	actualPodResourceAllocationInfo = &PodResourceAllocationInfo{}
 	actualPodResourceAllocationInfo.AllocationEntries = sc.cache.GetPodResourceAllocation()
-	require.NoError(t, err, "failed to get pod resource allocation info")
+
 	require.Equal(t, expectedPodResourceAllocationInfo, actualPodResourceAllocationInfo, "pod resource allocation info is not equal")
 }

pkg/kubelet/status/state/state_mem.go

@@ -32,10 +32,13 @@ type stateMemory struct {
 var _ State = &stateMemory{}
 
 // NewStateMemory creates new State to track resources allocated to pods
-func NewStateMemory() State {
+func NewStateMemory(alloc PodResourceAllocation) State {
+	if alloc == nil {
+		alloc = PodResourceAllocation{}
+	}
 	klog.V(2).InfoS("Initialized new in-memory state store for pod resource allocation tracking")
 	return &stateMemory{
-		podAllocation:   PodResourceAllocation{},
+		podAllocation:   alloc,
 		podResizeStatus: PodResizeStatus{},
 	}
 }
@@ -74,15 +77,6 @@ func (s *stateMemory) SetContainerResourceAllocation(podUID string, containerNam
 	return nil
 }
 
-func (s *stateMemory) SetPodResourceAllocation(a PodResourceAllocation) error {
-	s.Lock()
-	defer s.Unlock()
-
-	s.podAllocation = a.Clone()
-	klog.V(3).InfoS("Updated pod resource allocation", "allocation", a)
-	return nil
-}
-
 func (s *stateMemory) SetPodResizeStatus(podUID string, resizeStatus v1.PodResizeStatus) {
 	s.Lock()
 	defer s.Unlock()