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Merge pull request #40495 from yujuhong/fnv_hash

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Automatic merge from submit-queue (batch tested with PRs 38739, 40480, 40495, 40172, 40393)

Use fnv hash in the CRI implementation

fnv is more stable than adler. This PR changes CRI implementation to
use fnv for generating container hashes, but leaving the old
implementation (dockertools/rkt). This is because hash is what kubelet
uses to identify a container -- changes to the hash will cause kubelet
to restart existing containers. This is ok for CRI implementation (which
requires a disruptive upgrade already), but not for older implementations.

#40140
This commit is contained in:
Kubernetes Submit Queue 2017-01-25 21:20:31 -08:00 committed by GitHub
commit 52863de51d
7 changed files with 26 additions and 16 deletions
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10
pkg/kubelet/container/helpers.go
View File

@ -20,6 +20,7 @@ import (
"bytes"
"fmt"
"hash/adler32"
"hash/fnv"
"strings"
"time"
@ -91,6 +92,15 @@ func ShouldContainerBeRestarted(container *v1.Container, pod *v1.Pod, podStatus
// HashContainer returns the hash of the container. It is used to compare
// the running container with its desired spec.
func HashContainer(container *v1.Container) uint64 {
hash := fnv.New32a()
hashutil.DeepHashObject(hash, *container)
return uint64(hash.Sum32())
}
// HashContainerLegacy returns the hash of the container. It is used to compare
// the running container with its desired spec.
// TODO: Delete this function after we deprecate dockertools.
func HashContainerLegacy(container *v1.Container) uint64 {
hash := adler32.New()
hashutil.DeepHashObject(hash, *container)
return uint64(hash.Sum32())

2
pkg/kubelet/dockertools/docker.go
View File

@ -302,7 +302,7 @@ func (p dockerPuller) GetImageRef(image string) (string, error) {
// only occur when instances of the same container in the same pod have the same UID. The
// chance is really slim.
func BuildDockerName(dockerName KubeletContainerName, container *v1.Container) (string, string, string) {
containerName := dockerName.ContainerName + "." + strconv.FormatUint(kubecontainer.HashContainer(container), 16)
containerName := dockerName.ContainerName + "." + strconv.FormatUint(kubecontainer.HashContainerLegacy(container), 16)
stableName := fmt.Sprintf("%s_%s_%s_%s",
containerNamePrefix,
containerName,

4
pkg/kubelet/dockertools/docker_manager.go
View File

@ -1075,7 +1075,7 @@ func (dm *DockerManager) podInfraContainerChanged(pod *v1.Pod, podInfraContainer
ImagePullPolicy: podInfraContainerImagePullPolicy,
Env: dm.podInfraContainerEnv,
}
return podInfraContainerStatus.Hash != kubecontainer.HashContainer(expectedPodInfraContainer), nil
return podInfraContainerStatus.Hash != kubecontainer.HashContainerLegacy(expectedPodInfraContainer), nil
}
// determine if the container root should be a read only filesystem.
@ -2087,7 +2087,7 @@ func (dm *DockerManager) computePodContainerChanges(pod *v1.Pod, podStatus *kube
// At this point, the container is running and pod infra container is good.
// We will look for changes and check healthiness for the container.
expectedHash := kubecontainer.HashContainer(&container)
expectedHash := kubecontainer.HashContainerLegacy(&container)
hash := containerStatus.Hash
containerChanged := hash != 0 && hash != expectedHash
if containerChanged {

14
pkg/kubelet/dockertools/docker_manager_test.go
View File

@ -585,7 +585,7 @@ func generatePodInfraContainerHash(pod *v1.Pod) uint64 {
Ports: ports,
ImagePullPolicy: podInfraContainerImagePullPolicy,
}
return kubecontainer.HashContainer(container)
return kubecontainer.HashContainerLegacy(container)
}
// runSyncPod is a helper function to retrieve the running pods from the fake
@ -855,7 +855,7 @@ func TestSyncPodsDoesNothing(t *testing.T) {
fakeDocker.SetFakeRunningContainers([]*FakeContainer{
{
ID: "1234",
Name: "/k8s_bar." + strconv.FormatUint(kubecontainer.HashContainer(&container), 16) + "_foo_new_12345678_0",
Name: "/k8s_bar." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&container), 16) + "_foo_new_12345678_0",
},
{
ID: "9876",
@ -885,14 +885,14 @@ func TestSyncPodWithRestartPolicy(t *testing.T) {
},
{
ID: "1234",
Name: "/k8s_succeeded." + strconv.FormatUint(kubecontainer.HashContainer(&containers[0]), 16) + "_foo_new_12345678_0",
Name: "/k8s_succeeded." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&containers[0]), 16) + "_foo_new_12345678_0",
ExitCode: 0,
StartedAt: time.Now(),
FinishedAt: time.Now(),
},
{
ID: "5678",
Name: "/k8s_failed." + strconv.FormatUint(kubecontainer.HashContainer(&containers[1]), 16) + "_foo_new_12345678_0",
Name: "/k8s_failed." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&containers[1]), 16) + "_foo_new_12345678_0",
ExitCode: 42,
StartedAt: time.Now(),
FinishedAt: time.Now(),
@ -964,7 +964,7 @@ func TestSyncPodBackoff(t *testing.T) {
Containers: containers,
})
stableId := "k8s_bad." + strconv.FormatUint(kubecontainer.HashContainer(&containers[1]), 16) + "_podfoo_new_12345678"
stableId := "k8s_bad." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&containers[1]), 16) + "_podfoo_new_12345678"
dockerContainers := []*FakeContainer{
{
ID: "9876",
@ -974,13 +974,13 @@ func TestSyncPodBackoff(t *testing.T) {
},
{
ID: "1234",
Name: "/k8s_good." + strconv.FormatUint(kubecontainer.HashContainer(&containers[0]), 16) + "_podfoo_new_12345678_0",
Name: "/k8s_good." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&containers[0]), 16) + "_podfoo_new_12345678_0",
StartedAt: startTime,
Running: true,
},
{
ID: "5678",
Name: "/k8s_bad." + strconv.FormatUint(kubecontainer.HashContainer(&containers[1]), 16) + "_podfoo_new_12345678_0",
Name: "/k8s_bad." + strconv.FormatUint(kubecontainer.HashContainerLegacy(&containers[1]), 16) + "_podfoo_new_12345678_0",
ExitCode: 42,
StartedAt: startTime,
FinishedAt: fakeClock.Now(),

2
pkg/kubelet/dockertools/labels.go
View File

@ -82,7 +82,7 @@ func newLabels(container *v1.Container, pod *v1.Pod, restartCount int, enableCus
}
labels[types.KubernetesContainerNameLabel] = container.Name
labels[kubernetesContainerHashLabel] = strconv.FormatUint(kubecontainer.HashContainer(container), 16)
labels[kubernetesContainerHashLabel] = strconv.FormatUint(kubecontainer.HashContainerLegacy(container), 16)
labels[kubernetesContainerRestartCountLabel] = strconv.Itoa(restartCount)
labels[kubernetesContainerTerminationMessagePathLabel] = container.TerminationMessagePath
labels[kubernetesContainerTerminationMessagePolicyLabel] = string(container.TerminationMessagePolicy)

4
pkg/kubelet/dockertools/labels_test.go
View File

@ -90,7 +90,7 @@ func TestLabels(t *testing.T) {
PodDeletionGracePeriod: pod.DeletionGracePeriodSeconds,
PodTerminationGracePeriod: pod.Spec.TerminationGracePeriodSeconds,
Name: container.Name,
Hash: strconv.FormatUint(kubecontainer.HashContainer(container), 16),
Hash: strconv.FormatUint(kubecontainer.HashContainerLegacy(container), 16),
RestartCount: restartCount,
TerminationMessagePath: container.TerminationMessagePath,
PreStopHandler: container.Lifecycle.PreStop,
@ -113,7 +113,7 @@ func TestLabels(t *testing.T) {
expected.PodTerminationGracePeriod = nil
expected.PreStopHandler = nil
// Because container is changed, the Hash should be updated
expected.Hash = strconv.FormatUint(kubecontainer.HashContainer(container), 16)
expected.Hash = strconv.FormatUint(kubecontainer.HashContainerLegacy(container), 16)
labels = newLabels(container, pod, restartCount, false)
containerInfo = getContainerInfoFromLabel(labels)
if !reflect.DeepEqual(containerInfo, expected) {

6
pkg/kubelet/rkt/rkt.go
View File

@ -772,7 +772,7 @@ func (r *Runtime) newAppcRuntimeApp(pod *v1.Pod, podIP string, c v1.Container, r
var annotations appctypes.Annotations = []appctypes.Annotation{
{
Name: *appctypes.MustACIdentifier(k8sRktContainerHashAnno),
Value: strconv.FormatUint(kubecontainer.HashContainer(&c), 10),
Value: strconv.FormatUint(kubecontainer.HashContainerLegacy(&c), 10),
},
{
Name: *appctypes.MustACIdentifier(types.KubernetesContainerNameLabel),
@ -923,7 +923,7 @@ func apiPodToruntimePod(uuid string, pod *v1.Pod) *kubecontainer.Pod {
ID: buildContainerID(&containerID{uuid, c.Name}),
Name: c.Name,
Image: c.Image,
Hash: kubecontainer.HashContainer(c),
Hash: kubecontainer.HashContainerLegacy(c),
})
}
return p
@ -1721,7 +1721,7 @@ func (r *Runtime) SyncPod(pod *v1.Pod, _ v1.PodStatus, podStatus *kubecontainer.
restartPod := false
for _, container := range pod.Spec.Containers {
expectedHash := kubecontainer.HashContainer(&container)
expectedHash := kubecontainer.HashContainerLegacy(&container)
c := runningPod.FindContainerByName(container.Name)
if c == nil {