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Job: Recheck DeletionTimestamp before adoption.

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This is necessary to avoid racing with the GC when it orphans
dependents.
This commit is contained in:
Anthony Yeh 2017-04-12 15:21:27 -07:00
parent fd8dd26d09
commit f502ab6a8b
2 changed files with 80 additions and 4 deletions
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14
pkg/controller/job/jobcontroller.go
View File

@ -364,7 +364,19 @@ func (jm *JobController) getPodsForJob(j *batch.Job) ([]*v1.Pod, error) {
if err != nil {
return nil, err
}
cm := controller.NewPodControllerRefManager(jm.podControl, j, selector, controllerKind)
// If any adoptions are attempted, we should first recheck for deletion
// with an uncached quorum read sometime after listing Pods (see #42639).
canAdoptFunc := controller.RecheckDeletionTimestamp(func() (metav1.Object, error) {
fresh, err := jm.kubeClient.BatchV1().Jobs(j.Namespace).Get(j.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
if fresh.UID != j.UID {
return nil, fmt.Errorf("original Job %v/%v is gone: got uid %v, wanted %v", j.Namespace, j.Name, fresh.UID, j.UID)
}
return fresh, nil
})
cm := controller.NewPodControllerRefManager(jm.podControl, j, selector, controllerKind, canAdoptFunc)
return cm.ClaimPods(pods)
}

70
pkg/controller/job/jobcontroller_test.go
View File

@ -677,13 +677,13 @@ func TestGetPodsForJob(t *testing.T) {
}
func TestGetPodsForJobAdopt(t *testing.T) {
clientset := clientset.NewForConfigOrDie(&restclient.Config{Host: "", ContentConfig: restclient.ContentConfig{GroupVersion: &api.Registry.GroupOrDie(v1.GroupName).GroupVersion}})
job1 := newJob(1, 1)
job1.Name = "job1"
clientset := fake.NewSimpleClientset(job1)
jm, informer := newJobControllerFromClient(clientset, controller.NoResyncPeriodFunc)
jm.podStoreSynced = alwaysReady
jm.jobStoreSynced = alwaysReady
job1 := newJob(1, 1)
job1.Name = "job1"
informer.Batch().V1().Jobs().Informer().GetIndexer().Add(job1)
pod1 := newPod("pod1", job1)
@ -702,6 +702,70 @@ func TestGetPodsForJobAdopt(t *testing.T) {
}
}
func TestGetPodsForJobNoAdoptIfBeingDeleted(t *testing.T) {
job1 := newJob(1, 1)
job1.Name = "job1"
job1.DeletionTimestamp = &metav1.Time{}
clientset := fake.NewSimpleClientset(job1)
jm, informer := newJobControllerFromClient(clientset, controller.NoResyncPeriodFunc)
jm.podStoreSynced = alwaysReady
jm.jobStoreSynced = alwaysReady
informer.Batch().V1().Jobs().Informer().GetIndexer().Add(job1)
pod1 := newPod("pod1", job1)
pod2 := newPod("pod2", job1)
// Make this pod an orphan. It should not be adopted because the Job is being deleted.
pod2.OwnerReferences = nil
informer.Core().V1().Pods().Informer().GetIndexer().Add(pod1)
informer.Core().V1().Pods().Informer().GetIndexer().Add(pod2)
pods, err := jm.getPodsForJob(job1)
if err != nil {
t.Fatalf("getPodsForJob() error: %v", err)
}
if got, want := len(pods), 1; got != want {
t.Errorf("len(pods) = %v, want %v", got, want)
}
if got, want := pods[0].Name, pod1.Name; got != want {
t.Errorf("pod.Name = %q, want %q", got, want)
}
}
func TestGetPodsForJobNoAdoptIfBeingDeletedRace(t *testing.T) {
job1 := newJob(1, 1)
job1.Name = "job1"
// The up-to-date object says it's being deleted.
job1.DeletionTimestamp = &metav1.Time{}
clientset := fake.NewSimpleClientset(job1)
jm, informer := newJobControllerFromClient(clientset, controller.NoResyncPeriodFunc)
jm.podStoreSynced = alwaysReady
jm.jobStoreSynced = alwaysReady
// The cache says it's NOT being deleted.
cachedJob := *job1
cachedJob.DeletionTimestamp = nil
informer.Batch().V1().Jobs().Informer().GetIndexer().Add(&cachedJob)
pod1 := newPod("pod1", job1)
pod2 := newPod("pod2", job1)
// Make this pod an orphan. It should not be adopted because the Job is being deleted.
pod2.OwnerReferences = nil
informer.Core().V1().Pods().Informer().GetIndexer().Add(pod1)
informer.Core().V1().Pods().Informer().GetIndexer().Add(pod2)
pods, err := jm.getPodsForJob(job1)
if err != nil {
t.Fatalf("getPodsForJob() error: %v", err)
}
if got, want := len(pods), 1; got != want {
t.Errorf("len(pods) = %v, want %v", got, want)
}
if got, want := pods[0].Name, pod1.Name; got != want {
t.Errorf("pod.Name = %q, want %q", got, want)
}
}
func TestGetPodsForJobRelease(t *testing.T) {
clientset := clientset.NewForConfigOrDie(&restclient.Config{Host: "", ContentConfig: restclient.ContentConfig{GroupVersion: &api.Registry.GroupOrDie(v1.GroupName).GroupVersion}})
jm, informer := newJobControllerFromClient(clientset, controller.NoResyncPeriodFunc)