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Code Issues Projects Releases Wiki Activity

Dont generatePodStatus twice for new pods

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This commit is contained in:
Prashanth Balasubramanian 2015-06-09 17:50:15 -07:00
parent 5a02fc07d8
commit b5ed0e9b13
8 changed files with 163 additions and 81 deletions
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2
pkg/kubelet/fake_pod_workers.go
View File

@ -37,7 +37,7 @@ func (f *fakePodWorkers) UpdatePod(pod *api.Pod, mirrorPod *api.Pod, updateCompl
if err != nil {
f.t.Errorf("Unexpected error: %v", err)
}
if err := f.syncPodFn(pod, mirrorPod, kubecontainer.Pods(pods).FindPodByID(pod.UID)); err != nil {
if err := f.syncPodFn(pod, mirrorPod, kubecontainer.Pods(pods).FindPodByID(pod.UID), SyncPodUpdate); err != nil {
f.t.Errorf("Unexpected error: %v", err)
}
}

52
pkg/kubelet/kubelet.go
View File

@ -88,7 +88,7 @@ type SyncHandler interface {
// Syncs current state to match the specified pods. SyncPodType specified what
// type of sync is occuring per pod. StartTime specifies the time at which
// syncing began (for use in monitoring).
SyncPods(pods []*api.Pod, podSyncTypes map[types.UID]metrics.SyncPodType, mirrorPods map[string]*api.Pod,
SyncPods(pods []*api.Pod, podSyncTypes map[types.UID]SyncPodType, mirrorPods map[string]*api.Pod,
startTime time.Time) error
}
@ -1078,7 +1078,7 @@ func (kl *Kubelet) makePodDataDirs(pod *api.Pod) error {
return nil
}
func (kl *Kubelet) syncPod(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod) error {
func (kl *Kubelet) syncPod(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod, updateType SyncPodType) error {
podFullName := kubecontainer.GetPodFullName(pod)
uid := pod.UID
@ -1130,10 +1130,38 @@ func (kl *Kubelet) syncPod(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecont
}
kl.volumeManager.SetVolumes(pod.UID, podVolumes)
podStatus, err := kl.generatePodStatus(pod)
if err != nil {
glog.Errorf("Unable to get status for pod %q (uid %q): %v", podFullName, uid, err)
return err
// The kubelet is the source of truth for pod status. It ignores the status sent from
// the apiserver and regenerates status for every pod update, incrementally updating
// the status it received at pod creation time.
//
// The container runtime needs 2 pieces of information from the status to sync a pod:
// The terminated state of containers (to restart them) and the podIp (for liveness probes).
// New pods don't have either, so we skip the expensive status generation step.
//
// If we end up here with a create event for an already running pod, it could result in a
// restart of its containers. This cannot happen unless the kubelet restarts, because the
// delete before the second create is processed by SyncPods, which cancels this pod worker.
//
// If the kubelet restarts, we have a bunch of running containers for which we get create
// events. This is ok, because the pod status for these will include the podIp and terminated
// status. Any race conditions here effectively boils down to -- the pod worker didn't sync
// state of a newly started container with the apiserver before the kubelet restarted, so
// it's OK to pretend like the kubelet started them after it restarted.
//
// Also note that deletes currently have an updateType of `create` set in UpdatePods.
// This, again, does not matter because deletes are not processed by this method.
var podStatus api.PodStatus
if updateType == SyncPodCreate {
podStatus = pod.Status
glog.V(3).Infof("Not generating pod status for new pod %v", podFullName)
} else {
var err error
podStatus, err = kl.generatePodStatus(pod)
if err != nil {
glog.Errorf("Unable to get status for pod %q (uid %q): %v", podFullName, uid, err)
return err
}
}
pullSecrets, err := kl.getPullSecretsForPod(pod)
@ -1306,7 +1334,7 @@ func (kl *Kubelet) filterOutTerminatedPods(allPods []*api.Pod) []*api.Pod {
}
// SyncPods synchronizes the configured list of pods (desired state) with the host current state.
func (kl *Kubelet) SyncPods(allPods []*api.Pod, podSyncTypes map[types.UID]metrics.SyncPodType,
func (kl *Kubelet) SyncPods(allPods []*api.Pod, podSyncTypes map[types.UID]SyncPodType,
mirrorPods map[string]*api.Pod, start time.Time) error {
defer func() {
metrics.SyncPodsLatency.Observe(metrics.SinceInMicroseconds(start))
@ -1344,7 +1372,7 @@ func (kl *Kubelet) SyncPods(allPods []*api.Pod, podSyncTypes map[types.UID]metri
})
// Note the number of containers for new pods.
if val, ok := podSyncTypes[pod.UID]; ok && (val == metrics.SyncPodCreate) {
if val, ok := podSyncTypes[pod.UID]; ok && (val == SyncPodCreate) {
metrics.ContainersPerPodCount.Observe(float64(len(pod.Spec.Containers)))
}
}
@ -1486,7 +1514,7 @@ func (kl *Kubelet) checkCapacityExceeded(pods []*api.Pod) (fitting []*api.Pod, n
}
// handleOutOfDisk detects if pods can't fit due to lack of disk space.
func (kl *Kubelet) handleOutOfDisk(pods []*api.Pod, podSyncTypes map[types.UID]metrics.SyncPodType) []*api.Pod {
func (kl *Kubelet) handleOutOfDisk(pods []*api.Pod, podSyncTypes map[types.UID]SyncPodType) []*api.Pod {
if len(podSyncTypes) == 0 {
// regular sync. no new pods
return pods
@ -1519,7 +1547,7 @@ func (kl *Kubelet) handleOutOfDisk(pods []*api.Pod, podSyncTypes map[types.UID]m
for i := range pods {
pod := pods[i]
// Only reject pods that didn't start yet.
if podSyncTypes[pod.UID] == metrics.SyncPodCreate {
if podSyncTypes[pod.UID] == SyncPodCreate {
kl.recorder.Eventf(pod, "OutOfDisk", "Cannot start the pod due to lack of disk space.")
kl.statusManager.SetPodStatus(pod, api.PodStatus{
Phase: api.PodFailed,
@ -1578,7 +1606,7 @@ func (kl *Kubelet) handleNotFittingPods(pods []*api.Pod) []*api.Pod {
// admitPods handles pod admission. It filters out terminated pods, and pods
// that don't fit on the node, and may reject pods if node is overcommitted.
func (kl *Kubelet) admitPods(allPods []*api.Pod, podSyncTypes map[types.UID]metrics.SyncPodType) []*api.Pod {
func (kl *Kubelet) admitPods(allPods []*api.Pod, podSyncTypes map[types.UID]SyncPodType) []*api.Pod {
// Pod phase progresses monotonically. Once a pod has reached a final state,
// it should never leave irregardless of the restart policy. The statuses
// of such pods should not be changed, and there is no need to sync them.
@ -1616,7 +1644,7 @@ func (kl *Kubelet) syncLoop(updates <-chan PodUpdate, handler SyncHandler) {
glog.Info("Starting kubelet main sync loop.")
for {
unsyncedPod := false
podSyncTypes := make(map[types.UID]metrics.SyncPodType)
podSyncTypes := make(map[types.UID]SyncPodType)
select {
case u, ok := <-updates:
if !ok {

63
pkg/kubelet/kubelet_test.go
View File

@ -42,7 +42,6 @@ import (
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/metrics"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/network"
"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
@ -427,7 +426,7 @@ func apiContainerToContainer(c docker.APIContainers) container.Container {
}
}
var emptyPodUIDs map[types.UID]metrics.SyncPodType
var emptyPodUIDs map[types.UID]SyncPodType
// TODO: Remove this function after all docker-specifc tests have been migrated
// to dockertools.
@ -2774,31 +2773,33 @@ func TestUpdateNodeStatusError(t *testing.T) {
}
func TestCreateMirrorPod(t *testing.T) {
testKubelet := newTestKubeletWithFakeRuntime(t)
kl := testKubelet.kubelet
manager := testKubelet.fakeMirrorClient
pod := &api.Pod{
ObjectMeta: api.ObjectMeta{
UID: "12345678",
Name: "bar",
Namespace: "foo",
Annotations: map[string]string{
ConfigSourceAnnotationKey: "file",
for _, updateType := range []SyncPodType{SyncPodCreate, SyncPodUpdate} {
testKubelet := newTestKubeletWithFakeRuntime(t)
kl := testKubelet.kubelet
manager := testKubelet.fakeMirrorClient
pod := &api.Pod{
ObjectMeta: api.ObjectMeta{
UID: "12345678",
Name: "bar",
Namespace: "foo",
Annotations: map[string]string{
ConfigSourceAnnotationKey: "file",
},
},
},
}
pods := []*api.Pod{pod}
kl.podManager.SetPods(pods)
err := kl.syncPod(pod, nil, container.Pod{})
if err != nil {
t.Errorf("unexpected error: %v", err)
}
podFullName := kubecontainer.GetPodFullName(pod)
if !manager.HasPod(podFullName) {
t.Errorf("expected mirror pod %q to be created", podFullName)
}
if manager.NumOfPods() != 1 || !manager.HasPod(podFullName) {
t.Errorf("expected one mirror pod %q, got %v", podFullName, manager.GetPods())
}
pods := []*api.Pod{pod}
kl.podManager.SetPods(pods)
err := kl.syncPod(pod, nil, container.Pod{}, updateType)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
podFullName := kubecontainer.GetPodFullName(pod)
if !manager.HasPod(podFullName) {
t.Errorf("expected mirror pod %q to be created", podFullName)
}
if manager.NumOfPods() != 1 || !manager.HasPod(podFullName) {
t.Errorf("expected one mirror pod %q, got %v", podFullName, manager.GetPods())
}
}
}
@ -2844,7 +2845,7 @@ func TestDeleteOutdatedMirrorPod(t *testing.T) {
pods := []*api.Pod{pod, mirrorPod}
kl.podManager.SetPods(pods)
err := kl.syncPod(pod, mirrorPod, container.Pod{})
err := kl.syncPod(pod, mirrorPod, container.Pod{}, SyncPodUpdate)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
@ -3044,7 +3045,7 @@ func TestHostNetworkAllowed(t *testing.T) {
},
}
kubelet.podManager.SetPods([]*api.Pod{pod})
err := kubelet.syncPod(pod, nil, container.Pod{})
err := kubelet.syncPod(pod, nil, container.Pod{}, SyncPodUpdate)
if err != nil {
t.Errorf("expected pod infra creation to succeed: %v", err)
}
@ -3073,7 +3074,7 @@ func TestHostNetworkDisallowed(t *testing.T) {
HostNetwork: true,
},
}
err := kubelet.syncPod(pod, nil, container.Pod{})
err := kubelet.syncPod(pod, nil, container.Pod{}, SyncPodUpdate)
if err == nil {
t.Errorf("expected pod infra creation to fail")
}
@ -3100,7 +3101,7 @@ func TestPrivilegeContainerAllowed(t *testing.T) {
},
}
kubelet.podManager.SetPods([]*api.Pod{pod})
err := kubelet.syncPod(pod, nil, container.Pod{})
err := kubelet.syncPod(pod, nil, container.Pod{}, SyncPodUpdate)
if err != nil {
t.Errorf("expected pod infra creation to succeed: %v", err)
}
@ -3126,7 +3127,7 @@ func TestPrivilegeContainerDisallowed(t *testing.T) {
},
},
}
err := kubelet.syncPod(pod, nil, container.Pod{})
err := kubelet.syncPod(pod, nil, container.Pod{}, SyncPodUpdate)
if err == nil {
t.Errorf("expected pod infra creation to fail")
}

21
pkg/kubelet/metrics/metrics.go
View File

@ -83,27 +83,6 @@ func Register(containerCache kubecontainer.RuntimeCache) {
})
}
type SyncPodType int
const (
SyncPodSync SyncPodType = iota
SyncPodUpdate
SyncPodCreate
)
func (sp SyncPodType) String() string {
switch sp {
case SyncPodCreate:
return "create"
case SyncPodUpdate:
return "update"
case SyncPodSync:
return "sync"
default:
return "unknown"
}
}
// Gets the time since the specified start in microseconds.
func SinceInMicroseconds(start time.Time) float64 {
return float64(time.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())

33
pkg/kubelet/pod_manager.go
View File

@ -22,7 +22,6 @@ import (
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/metrics"
"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
"github.com/golang/glog"
)
@ -48,13 +47,35 @@ type podManager interface {
GetPodByName(namespace, name string) (*api.Pod, bool)
GetPodsAndMirrorMap() ([]*api.Pod, map[string]*api.Pod)
SetPods(pods []*api.Pod)
UpdatePods(u PodUpdate, podSyncTypes map[types.UID]metrics.SyncPodType)
UpdatePods(u PodUpdate, podSyncTypes map[types.UID]SyncPodType)
DeleteOrphanedMirrorPods()
TranslatePodUID(uid types.UID) types.UID
IsMirrorPodOf(mirrorPod, pod *api.Pod) bool
mirrorClient
}
// SyncPodType classifies pod updates, eg: create, update.
type SyncPodType int
const (
SyncPodSync SyncPodType = iota
SyncPodUpdate
SyncPodCreate
)
func (sp SyncPodType) String() string {
switch sp {
case SyncPodCreate:
return "create"
case SyncPodUpdate:
return "update"
case SyncPodSync:
return "sync"
default:
return "unknown"
}
}
// All maps in basicPodManager should be set by calling UpdatePods();
// individual arrays/maps are not immutable and no other methods should attempt
// to modify them.
@ -83,7 +104,7 @@ func newBasicPodManager(apiserverClient client.Interface) *basicPodManager {
}
// Update the internal pods with those provided by the update.
func (pm *basicPodManager) UpdatePods(u PodUpdate, podSyncTypes map[types.UID]metrics.SyncPodType) {
func (pm *basicPodManager) UpdatePods(u PodUpdate, podSyncTypes map[types.UID]SyncPodType) {
pm.lock.Lock()
defer pm.lock.Unlock()
switch u.Op {
@ -101,7 +122,7 @@ func (pm *basicPodManager) UpdatePods(u PodUpdate, podSyncTypes map[types.UID]me
for uid := range pm.podByUID {
if _, ok := existingPods[uid]; !ok {
podSyncTypes[uid] = metrics.SyncPodCreate
podSyncTypes[uid] = SyncPodCreate
}
}
case UPDATE:
@ -110,7 +131,7 @@ func (pm *basicPodManager) UpdatePods(u PodUpdate, podSyncTypes map[types.UID]me
// Store the updated pods. Don't worry about filtering host ports since those
// pods will never be looked up.
for i := range u.Pods {
podSyncTypes[u.Pods[i].UID] = metrics.SyncPodUpdate
podSyncTypes[u.Pods[i].UID] = SyncPodUpdate
}
allPods := applyUpdates(u.Pods, pm.getAllPods())
pm.setPods(allPods)
@ -121,7 +142,7 @@ func (pm *basicPodManager) UpdatePods(u PodUpdate, podSyncTypes map[types.UID]me
// Mark all remaining pods as sync.
for uid := range pm.podByUID {
if _, ok := podSyncTypes[uid]; !ok {
podSyncTypes[uid] = metrics.SyncPodSync
podSyncTypes[uid] = SyncPodSync
}
}
}

23
pkg/kubelet/pod_workers.go
View File

@ -34,7 +34,7 @@ type PodWorkers interface {
ForgetNonExistingPodWorkers(desiredPods map[types.UID]empty)
}
type syncPodFnType func(*api.Pod, *api.Pod, kubecontainer.Pod) error
type syncPodFnType func(*api.Pod, *api.Pod, kubecontainer.Pod, SyncPodType) error
type podWorkers struct {
// Protects all per worker fields.
@ -71,6 +71,9 @@ type workUpdate struct {
// Function to call when the update is complete.
updateCompleteFn func()
// A string describing the type of this update, eg: create
updateType SyncPodType
}
func newPodWorkers(runtimeCache kubecontainer.RuntimeCache, syncPodFn syncPodFnType,
@ -103,7 +106,7 @@ func (p *podWorkers) managePodLoop(podUpdates <-chan workUpdate) {
}
err = p.syncPodFn(newWork.pod, newWork.mirrorPod,
kubecontainer.Pods(pods).FindPodByID(newWork.pod.UID))
kubecontainer.Pods(pods).FindPodByID(newWork.pod.UID), newWork.updateType)
if err != nil {
glog.Errorf("Error syncing pod %s, skipping: %v", newWork.pod.UID, err)
p.recorder.Eventf(newWork.pod, "failedSync", "Error syncing pod, skipping: %v", err)
@ -122,6 +125,14 @@ func (p *podWorkers) UpdatePod(pod *api.Pod, mirrorPod *api.Pod, updateComplete
var podUpdates chan workUpdate
var exists bool
// TODO: Pipe this through from the kubelet. Currently kubelets operating with
// snapshot updates (PodConfigNotificationSnapshot) will send updates, creates
// and deletes as SET operations, which makes updates indistinguishable from
// creates. The intent here is to communicate to the pod worker that it can take
// certain liberties, like skipping status generation, when it receives a create
// event for a pod.
updateType := SyncPodUpdate
p.podLock.Lock()
defer p.podLock.Unlock()
if podUpdates, exists = p.podUpdates[uid]; !exists {
@ -131,6 +142,12 @@ func (p *podWorkers) UpdatePod(pod *api.Pod, mirrorPod *api.Pod, updateComplete
// the channel is empty, so buffer of size 1 is enough.
podUpdates = make(chan workUpdate, 1)
p.podUpdates[uid] = podUpdates
// Creating a new pod worker either means this is a new pod, or that the
// kubelet just restarted. In either case the kubelet is willing to believe
// the status of the pod for the first pod worker sync. See corresponding
// comment in syncPod.
updateType = SyncPodCreate
go func() {
defer util.HandleCrash()
p.managePodLoop(podUpdates)
@ -142,12 +159,14 @@ func (p *podWorkers) UpdatePod(pod *api.Pod, mirrorPod *api.Pod, updateComplete
pod: pod,
mirrorPod: mirrorPod,
updateCompleteFn: updateComplete,
updateType: updateType,
}
} else {
p.lastUndeliveredWorkUpdate[pod.UID] = workUpdate{
pod: pod,
mirrorPod: mirrorPod,
updateCompleteFn: updateComplete,
updateType: updateType,
}
}
}

48
pkg/kubelet/pod_workers_test.go
View File

@ -41,19 +41,21 @@ func newPod(uid, name string) *api.Pod {
}
}
func createPodWorkers() (*podWorkers, map[types.UID][]string) {
func createFakeRuntimeCache(fakeRecorder *record.FakeRecorder) kubecontainer.RuntimeCache {
fakeDocker := &dockertools.FakeDockerClient{}
fakeRecorder := &record.FakeRecorder{}
np, _ := network.InitNetworkPlugin([]network.NetworkPlugin{}, "", network.NewFakeHost(nil))
dockerManager := dockertools.NewFakeDockerManager(fakeDocker, fakeRecorder, nil, nil, dockertools.PodInfraContainerImage, 0, 0, "", kubecontainer.FakeOS{}, np, nil, nil, newKubeletRuntimeHooks(fakeRecorder))
fakeRuntimeCache := kubecontainer.NewFakeRuntimeCache(dockerManager)
return kubecontainer.NewFakeRuntimeCache(dockerManager)
}
func createPodWorkers() (*podWorkers, map[types.UID][]string) {
lock := sync.Mutex{}
processed := make(map[types.UID][]string)
fakeRecorder := &record.FakeRecorder{}
fakeRuntimeCache := createFakeRuntimeCache(fakeRecorder)
podWorkers := newPodWorkers(
fakeRuntimeCache,
func(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod) error {
func(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod, updateType SyncPodType) error {
func() {
lock.Lock()
defer lock.Unlock()
@ -118,6 +120,38 @@ func TestUpdatePod(t *testing.T) {
}
}
func TestUpdateType(t *testing.T) {
syncType := make(chan SyncPodType)
fakeRecorder := &record.FakeRecorder{}
podWorkers := newPodWorkers(
createFakeRuntimeCache(fakeRecorder),
func(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod, updateType SyncPodType) error {
func() {
syncType <- updateType
}()
return nil
},
fakeRecorder,
)
cases := map[*api.Pod][]SyncPodType{
newPod("u1", "n1"): {SyncPodCreate, SyncPodUpdate},
newPod("u2", "n1"): {SyncPodCreate},
}
for p, expectedTypes := range cases {
for i := range expectedTypes {
podWorkers.UpdatePod(p, nil, func() {})
select {
case gotType := <-syncType:
if gotType != expectedTypes[i] {
t.Fatalf("Expected sync type %v got %v for pod with uid %v", expectedTypes[i], gotType, p.UID)
}
case <-time.After(100 * time.Millisecond):
t.Errorf("Unexpected delay is running pod worker")
}
}
}
}
func TestForgetNonExistingPodWorkers(t *testing.T) {
podWorkers, _ := createPodWorkers()
@ -159,12 +193,12 @@ type simpleFakeKubelet struct {
wg sync.WaitGroup
}
func (kl *simpleFakeKubelet) syncPod(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod) error {
func (kl *simpleFakeKubelet) syncPod(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod, updateType SyncPodType) error {
kl.pod, kl.mirrorPod, kl.runningPod = pod, mirrorPod, runningPod
return nil
}
func (kl *simpleFakeKubelet) syncPodWithWaitGroup(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod) error {
func (kl *simpleFakeKubelet) syncPodWithWaitGroup(pod *api.Pod, mirrorPod *api.Pod, runningPod kubecontainer.Pod, updateType SyncPodType) error {
kl.pod, kl.mirrorPod, kl.runningPod = pod, mirrorPod, runningPod
kl.wg.Done()
return nil

2
pkg/kubelet/runonce.go
View File

@ -104,7 +104,7 @@ func (kl *Kubelet) runPod(pod *api.Pod, retryDelay time.Duration) error {
glog.Infof("pod %q containers not running: syncing", pod.Name)
// We don't create mirror pods in this mode; pass a dummy boolean value
// to sycnPod.
if err = kl.syncPod(pod, nil, p); err != nil {
if err = kl.syncPod(pod, nil, p, SyncPodUpdate); err != nil {
return fmt.Errorf("error syncing pod: %v", err)
}
if retry >= RunOnceMaxRetries {