fix InPlacePodVerticalScaling restore bug: the content wrote to and read from file pod_status are different

pkg/kubelet/status/state/checkpoint.go

@@ -18,48 +18,62 @@ package state
 
 import (
 	"encoding/json"
-
+	"k8s.io/api/core/v1"
-	v1 "k8s.io/api/core/v1"
 	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
 	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/checksum"
 )
 
-var _ checkpointmanager.Checkpoint = &PodResourceAllocationCheckpoint{}
+var _ checkpointmanager.Checkpoint = &Checkpoint{}
 
-// PodResourceAllocationCheckpoint is used to store resources allocated to a pod in checkpoint
+type PodResourceAllocationInfo struct {
-type PodResourceAllocationCheckpoint struct {
 	AllocationEntries   map[string]map[string]v1.ResourceRequirements `json:"allocationEntries,omitempty"`
 	ResizeStatusEntries map[string]v1.PodResizeStatus                 `json:"resizeStatusEntries,omitempty"`
-	Checksum            checksum.Checksum                             `json:"checksum"`
 }
 
-// NewPodResourceAllocationCheckpoint returns an instance of Checkpoint
+// Checkpoint represents a structure to store pod resource allocation checkpoint data
-func NewPodResourceAllocationCheckpoint() *PodResourceAllocationCheckpoint {
+type Checkpoint struct {
-	//lint:ignore unexported-type-in-api user-facing error message
+	// Data is a JSON serialized checkpoint data
-	return &PodResourceAllocationCheckpoint{
+	Data string `json:"data"`
-		AllocationEntries:   make(map[string]map[string]v1.ResourceRequirements),
+	// Checksum is a checksum of Data
-		ResizeStatusEntries: make(map[string]v1.PodResizeStatus),
+	Checksum checksum.Checksum `json:"checksum"`
+}
+
+// NewCheckpoint creates a new checkpoint from a list of claim info states
+func NewCheckpoint(data *PodResourceAllocationInfo) (*Checkpoint, error) {
+
+	praData, err := json.Marshal(data)
+	if err != nil {
+		return nil, err
 	}
+
+	cp := &Checkpoint{
+		Data: string(praData),
+	}
+	cp.Checksum = checksum.New(cp.Data)
+	return cp, nil
 }
 
-// MarshalCheckpoint returns marshalled checkpoint
+func (cp *Checkpoint) MarshalCheckpoint() ([]byte, error) {
-func (prc *PodResourceAllocationCheckpoint) MarshalCheckpoint() ([]byte, error) {
+	return json.Marshal(cp)
-	// make sure checksum wasn't set before so it doesn't affect output checksum
-	prc.Checksum = 0
-	prc.Checksum = checksum.New(prc)
-	return json.Marshal(*prc)
 }
 
-// UnmarshalCheckpoint tries to unmarshal passed bytes to checkpoint
+// UnmarshalCheckpoint unmarshals checkpoint from JSON
-func (prc *PodResourceAllocationCheckpoint) UnmarshalCheckpoint(blob []byte) error {
+func (cp *Checkpoint) UnmarshalCheckpoint(blob []byte) error {
-	return json.Unmarshal(blob, prc)
+	return json.Unmarshal(blob, cp)
 }
 
-// VerifyChecksum verifies that current checksum of checkpoint is valid
+// VerifyChecksum verifies that current checksum
-func (prc *PodResourceAllocationCheckpoint) VerifyChecksum() error {
+// of checkpointed Data is valid
-	ck := prc.Checksum
+func (cp *Checkpoint) VerifyChecksum() error {
-	prc.Checksum = 0
+	return cp.Checksum.Verify(cp.Data)
-	err := ck.Verify(prc)
+}
-	prc.Checksum = ck
+
-	return err
+// GetPodResourceAllocationInfo returns Pod Resource Allocation info states from checkpoint
+func (cp *Checkpoint) GetPodResourceAllocationInfo() (*PodResourceAllocationInfo, error) {
+	var data PodResourceAllocationInfo
+	if err := json.Unmarshal([]byte(cp.Data), &data); err != nil {
+		return nil, err
+	}
+
+	return &data, nil
 }

pkg/kubelet/status/state/state_checkpoint.go

@@ -61,7 +61,10 @@ func (sc *stateCheckpoint) restoreState() error {
 	defer sc.mux.Unlock()
 	var err error
 
-	checkpoint := NewPodResourceAllocationCheckpoint()
+	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 == errors.ErrCheckpointNotFound {
@@ -69,32 +72,36 @@ func (sc *stateCheckpoint) restoreState() error {
 		}
 		return err
 	}
-
+	praInfo, err := checkpoint.GetPodResourceAllocationInfo()
-	sc.cache.SetPodResourceAllocation(checkpoint.AllocationEntries)
+	if err != nil {
-	sc.cache.SetResizeStatus(checkpoint.ResizeStatusEntries)
+		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)
+	}
+	err = sc.cache.SetResizeStatus(praInfo.ResizeStatusEntries)
+	if err != nil {
+		return fmt.Errorf("failed to set resize status: %w", err)
+	}
 	klog.V(2).InfoS("State checkpoint: restored pod resource allocation state from checkpoint")
 	return nil
 }
 
 // saves state to a checkpoint, caller is responsible for locking
 func (sc *stateCheckpoint) storeState() error {
-	checkpoint := NewPodResourceAllocationCheckpoint()
-
 	podAllocation := sc.cache.GetPodResourceAllocation()
-	for pod := range podAllocation {
-		checkpoint.AllocationEntries[pod] = make(map[string]v1.ResourceRequirements)
-		for container, alloc := range podAllocation[pod] {
-			checkpoint.AllocationEntries[pod][container] = alloc
-		}
-	}
 
 	podResizeStatus := sc.cache.GetResizeStatus()
-	checkpoint.ResizeStatusEntries = make(map[string]v1.PodResizeStatus)
+	checkpoint, err := NewCheckpoint(&PodResourceAllocationInfo{
-	for pUID, rStatus := range podResizeStatus {
+		AllocationEntries:   podAllocation,
-		checkpoint.ResizeStatusEntries[pUID] = rStatus
+		ResizeStatusEntries: podResizeStatus,
+	})
+	if err != nil {
+		klog.ErrorS(err, "Failed to create checkpoint")
+		return err
 	}
-
+	err = sc.checkpointManager.CreateCheckpoint(sc.checkpointName, checkpoint)
-	err := sc.checkpointManager.CreateCheckpoint(sc.checkpointName, checkpoint)
 	if err != nil {
 		klog.ErrorS(err, "Failed to save pod allocation checkpoint")
 		return err

pkg/kubelet/status/state/state_checkpoint_test.go

@@ -0,0 +1,175 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package state
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
+)
+
+func newTestStateCheckpoint(t *testing.T) *stateCheckpoint {
+	// create temp dir
+	testingDir, err := os.MkdirTemp("", "pod_resource_allocation_state_test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		if err := os.RemoveAll(testingDir); err != nil {
+			t.Fatal(err)
+		}
+	}()
+	cache := NewStateMemory()
+	checkpointManager, err := checkpointmanager.NewCheckpointManager(testingDir)
+	require.NoError(t, err, "failed to create checkpoint manager")
+	checkpointName := "pod_state_checkpoint"
+	sc := &stateCheckpoint{
+		cache:             cache,
+		checkpointManager: checkpointManager,
+		checkpointName:    checkpointName,
+	}
+	return sc
+}
+
+func Test_stateCheckpoint_storeState(t *testing.T) {
+	sc := newTestStateCheckpoint(t)
+	type args struct {
+		podResourceAllocation PodResourceAllocation
+	}
+
+	tests := []struct {
+		name string
+		args args
+	}{}
+	suffix := []string{"Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "n", "u", "m", "k", "M", "G", "T", "P", "E", ""}
+	factor := []string{"1", "0.1", "0.03", "10", "100", "512", "1000", "1024", "700", "10000"}
+	for _, fact := range factor {
+		for _, suf := range suffix {
+			if (suf == "E" || suf == "Ei") && (fact == "1000" || fact == "10000") {
+				// when fact is 1000 or 10000, suffix "E" or "Ei", the quantity value is overflow
+				// see detail https://github.com/kubernetes/apimachinery/blob/95b78024e3feada7739b40426690b4f287933fd8/pkg/api/resource/quantity.go#L301
+				continue
+			}
+			tests = append(tests, struct {
+				name string
+				args args
+			}{
+				name: fmt.Sprintf("resource - %s%s", fact, suf),
+				args: args{
+					podResourceAllocation: PodResourceAllocation{
+						"pod1": {
+							"container1": {
+								Requests: v1.ResourceList{
+									v1.ResourceCPU:    resource.MustParse(fmt.Sprintf("%s%s", fact, suf)),
+									v1.ResourceMemory: resource.MustParse(fmt.Sprintf("%s%s", fact, suf)),
+								},
+							},
+						},
+					},
+				},
+			})
+		}
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := sc.cache.ClearState()
+			require.NoError(t, err, "failed to clear state")
+
+			defer func() {
+				err = sc.checkpointManager.RemoveCheckpoint(sc.checkpointName)
+				require.NoError(t, err, "failed to remove checkpoint")
+			}()
+
+			err = sc.cache.SetPodResourceAllocation(tt.args.podResourceAllocation)
+			require.NoError(t, err, "failed to set pod resource allocation")
+
+			err = sc.storeState()
+			require.NoError(t, err, "failed to store state")
+
+			// deep copy cache
+			originCache := NewStateMemory()
+			podAllocation := sc.cache.GetPodResourceAllocation()
+			err = originCache.SetPodResourceAllocation(podAllocation)
+			require.NoError(t, err, "failed to set pod resource allocation")
+
+			err = sc.cache.ClearState()
+			require.NoError(t, err, "failed to clear state")
+
+			err = sc.restoreState()
+			require.NoError(t, err, "failed to restore state")
+
+			restoredCache := sc.cache
+			require.Equal(t, len(originCache.GetPodResourceAllocation()), len(restoredCache.GetPodResourceAllocation()), "restored pod resource allocation is not equal to original pod resource allocation")
+			for podUID, containerResourceList := range originCache.GetPodResourceAllocation() {
+				require.Equal(t, len(containerResourceList), len(restoredCache.GetPodResourceAllocation()[podUID]), "restored pod resource allocation is not equal to original pod resource allocation")
+				for containerName, resourceList := range containerResourceList {
+					for name, quantity := range resourceList.Requests {
+						if !quantity.Equal(restoredCache.GetPodResourceAllocation()[podUID][containerName].Requests[name]) {
+							t.Errorf("restored pod resource allocation is not equal to original pod resource allocation")
+						}
+					}
+				}
+			}
+		})
+	}
+}
+
+func Test_stateCheckpoint_formatUpgraded(t *testing.T) {
+	// Based on the PodResourceAllocationInfo struct, it's mostly possible that new field will be added
+	// in struct PodResourceAllocationInfo, rather than in struct PodResourceAllocationInfo.AllocationEntries.
+	// Emulate upgrade scenario by pretending that `ResizeStatusEntries` is a new field.
+	// The checkpoint content doesn't have it and that shouldn't prevent the checkpoint from being loaded.
+	sc := newTestStateCheckpoint(t)
+
+	// prepare old checkpoint, ResizeStatusEntries is unset,
+	// pretend that the old checkpoint is unaware for the field ResizeStatusEntries
+	checkpointContent := `{"data":"{\"allocationEntries\":{\"pod1\":{\"container1\":{\"requests\":{\"cpu\":\"1Ki\",\"memory\":\"1Ki\"}}}}}","checksum":1555601526}`
+	checkpoint := &Checkpoint{}
+	err := checkpoint.UnmarshalCheckpoint([]byte(checkpointContent))
+	require.NoError(t, err, "failed to unmarshal checkpoint")
+
+	err = sc.checkpointManager.CreateCheckpoint(sc.checkpointName, checkpoint)
+	require.NoError(t, err, "failed to create old checkpoint")
+
+	err = sc.restoreState()
+	require.NoError(t, err, "failed to restore state")
+
+	expectedPodResourceAllocationInfo := &PodResourceAllocationInfo{
+		AllocationEntries: map[string]map[string]v1.ResourceRequirements{
+			"pod1": {
+				"container1": {
+					Requests: v1.ResourceList{
+						v1.ResourceCPU:    resource.MustParse("1Ki"),
+						v1.ResourceMemory: resource.MustParse("1Ki"),
+					},
+				},
+			},
+		},
+		ResizeStatusEntries: map[string]v1.PodResizeStatus{},
+	}
+	actualPodResourceAllocationInfo := &PodResourceAllocationInfo{}
+	actualPodResourceAllocationInfo.AllocationEntries = sc.cache.GetPodResourceAllocation()
+	actualPodResourceAllocationInfo.ResizeStatusEntries = sc.cache.GetResizeStatus()
+	require.NoError(t, err, "failed to get pod resource allocation info")
+	require.Equal(t, expectedPodResourceAllocationInfo, actualPodResourceAllocationInfo, "pod resource allocation info is not equal")
+}