{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/64144402","id":64144402,"diff_hunk":"@@ -171,6 +211,140 @@ func referencesDiffs(old []metatypes.OwnerReference, new []metatypes.OwnerRefere\n \treturn added, removed\n }\n \n+func shouldOrphanDependents(e event, accessor meta.Object) bool {\n+\t// The delta_fifo may combine the creation and update of the object into one\n+\t// event, so we need to check AddEvent as well.\n+\tif e.oldObj == nil {\n+\t\tif accessor.GetDeletionTimestamp() == nil {\n+\t\t\treturn false\n+\t\t}\n+\t} else {\n+\t\toldAccessor, err := meta.Accessor(e.oldObj)\n+\t\tif err != nil {\n+\t\t\tutilruntime.HandleError(fmt.Errorf(\"cannot access oldObj: %v\", err))\n+\t\t\treturn false\n+\t\t}\n+\t\t// ignore the event if it's not updating DeletionTimestamp from non-nil to nil.\n+\t\tif accessor.GetDeletionTimestamp() == nil || oldAccessor.GetDeletionTimestamp() != nil {\n+\t\t\treturn false\n+\t\t}\n+\t}\n+\treturn sets.NewString(accessor.GetFinalizers()...).Has(api.OrphanFinalizer)\n+}\n+\n+func (gc *GarbageCollector) orhpanDependents(owner *node, dependents []*node, retries int) error {\n+\tvar failedDependents []objectReference\n+\tfor _, dependent := range dependents {\n+\t\tdeleteOwnerRefPatch := fmt.Sprintf(`{\"metadata\":{\"ownerReferences\":[{\"$patch\":\"delete\",\"uid\":\"%s\"}]}}`, owner.identity.UID)\n+\t\tpatched := false\n+\t\tfor count := 0; count < retries; count++ {\n+\t\t\t_, err := gc.patchObject(dependent.identity, []byte(deleteOwnerRefPatch))\n+\t\t\t// note that if the target ownerReference doesn't exist in the\n+\t\t\t// dependent, strategic merge patch will NOT return an error.\n+\t\t\tif err == nil {\n+\t\t\t\tpatched = true\n+\t\t\t\tbreak\n+\t\t\t} else {\n+\t\t\t\tutilruntime.HandleError(fmt.Errorf(\"orphaning %s failed with %v\", dependent.identity, err))\n+\t\t\t}\n+\t\t}\n+\t\tif !patched {\n+\t\t\tfailedDependents = append(failedDependents, dependent.identity)\n+\t\t}\n+\t}\n+\tif len(failedDependents) != 0 {\n+\t\treturn fmt.Errorf(\"failed to orphan dependents %v, please manually orphan them and finalize the owner %s\", failedDependents, owner.identity)\n+\t}\n+\treturn nil\n+}\n+\n+// TODO: Using Patch when strategicmerge supports deleting an entry from a\n+// slice of a base type.\n+func (gc *GarbageCollector) removeOrphanFinalizer(owner *node, retries int) error {\n+\tupdated := false\n+\tfor count := 0; count < retries; count++ {\n+\t\townerObject, err := gc.getObject(owner.identity)\n+\t\tif err != nil {\n+\t\t\tutilruntime.HandleError(fmt.Errorf(\"cannot finalize owner %s, because cannot get it, tried %d times\", owner.identity, count+1))\n+\t\t\tcontinue\n+\t\t}\n+\t\taccessor, err := meta.Accessor(ownerObject)\n+\t\tif err != nil {\n+\t\t\tutilruntime.HandleError(fmt.Errorf(\"cannot access the owner object: %v, tried %d times\", err, count+1))\n+\t\t\tcontinue\n+\t\t}\n+\t\tfinalizers := accessor.GetFinalizers()\n+\t\tvar newFinalizers []string\n+\t\tfound := false\n+\t\tfor _, f := range finalizers {\n+\t\t\tif f == api.OrphanFinalizer {\n+\t\t\t\tfound = true\n+\t\t\t} else {\n+\t\t\t\tnewFinalizers = append(newFinalizers, f)\n+\t\t\t}\n+\t\t}\n+\t\tif !found {\n+\t\t\tglog.V(6).Infof(\"the orphan finalizer is already removed from object %s\", owner.identity)\n+\t\t\tupdated = true\n+\t\t\tbreak\n+\t\t}\n+\t\t// remove the owner from dependent's OwnerReferences\n+\t\townerObject.SetFinalizers(newFinalizers)\n+\t\t_, err = gc.updateObject(owner.identity, ownerObject)\n+\t\tif err == nil {\n+\t\t\tupdated = true\n+\t\t\tbreak\n+\t\t}\n+\t\tif err != nil && !errors.IsConflict(err) {\n+\t\t\tutilruntime.HandleError(fmt.Errorf(\"cannot update the finalizers of owner %s, with error: %v, tried %d times\", owner.identity, err, count+1))\n+\t\t\tcontinue\n+\t\t}\n+\t\t// retry without reporting an error if it's a conflict\n+\t\tglog.V(6).Infof(\"got conflict updating the owner object %s, tried %d times\", owner.identity, count+1)\n+\t}\n+\tif !updated {\n+\t\treturn fmt.Errorf(\"updateMaxRetries(%d) has reached, giving up on finalizing the owner object %s. Please manually finalize it\", retries, owner.identity)\n+\t}\n+\treturn nil\n+}\n+\n+// orphanFinalizer dequeues a node from the orphanQueue, then finds its dependents\n+// based on the graph maintained by the GC, then removes it from the\n+// OwnerReferences of its dependents, and finally updates the owner to remove\n+// the \"Orphan\" finalizer. The node is add back into the orphanQueue if any of\n+// these steps fail.\n+func (gc *GarbageCollector) orphanFinalizer() {\n+\tkey, quit := gc.orphanQueue.Get()\n+\tif quit {\n+\t\treturn\n+\t}\n+\tdefer gc.orphanQueue.Done(key)\n+\towner, ok := key.(*node)\n+\tif !ok {\n+\t\tutilruntime.HandleError(fmt.Errorf(\"expect *node, got %#v\", key))\n+\t}\n+\t// we don't need to lock each element, because they never get updated\n+\towner.dependentsLock.RLock()\n+\tdependents := make([]*node, 0, len(owner.dependents))\n+\tfor dependent := range owner.dependents {\n+\t\tdependents = append(dependents, dependent)\n+\t}\n+\towner.dependentsLock.RUnlock()\n+\n+\t// patch operation has less conflicts, so make its max retries lower\n+\tconst patchMaxRetries = 3\n+\terr := gc.orhpanDependents(owner, dependents, patchMaxRetries)\n+\tif err != nil {\n+\t\tgc.orphanQueue.Add(owner)\n+\t}\n+\t// update the owner, remove \"orphaningFinalizer\" from its finalizers list\n+\tconst updateMaxRetries = 5","path":"pkg/controller/garbagecollector/garbagecollector.go","position":261,"original_position":261,"commit_id":"150507f3761d0b02f19872a955b5966749429899","original_commit_id":"150507f3761d0b02f19872a955b5966749429899","user":{"login":"caesarxuchao","id":2823529,"avatar_url":"https://avatars.githubusercontent.com/u/2823529?v=3","gravatar_id":"","url":"https://api.github.com/users/caesarxuchao","html_url":"https://github.com/caesarxuchao","followers_url":"https://api.github.com/users/caesarxuchao/followers","following_url":"https://api.github.com/users/caesarxuchao/following{/other_user}","gists_url":"https://api.github.com/users/caesarxuchao/gists{/gist_id}","starred_url":"https://api.github.com/users/caesarxuchao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caesarxuchao/subscriptions","organizations_url":"https://api.github.com/users/caesarxuchao/orgs","repos_url":"https://api.github.com/users/caesarxuchao/repos","events_url":"https://api.github.com/users/caesarxuchao/events{/privacy}","received_events_url":"https://api.github.com/users/caesarxuchao/received_events","type":"User","site_admin":false},"body":"I removed the loop in patch, but kept the loop in update, because a update operation can easily get false conflicts.","created_at":"2016-05-22T05:35:24Z","updated_at":"2016-05-22T05:35:24Z","html_url":"https://github.com/kubernetes/kubernetes/pull/25599#discussion_r64144402","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25599","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/64144402"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/25599#discussion_r64144402"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25599"}}},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25599","id":70072387,"html_url":"https://github.com/kubernetes/kubernetes/pull/25599","diff_url":"https://github.com/kubernetes/kubernetes/pull/25599.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/25599.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/25599","number":25599,"state":"open","locked":false,"title":"Add orphaning finalizer logic to GC","user":{"login":"caesarxuchao","id":2823529,"avatar_url":"https://avatars.githubusercontent.com/u/2823529?v=3","gravatar_id":"","url":"https://api.github.com/users/caesarxuchao","html_url":"https://github.com/caesarxuchao","followers_url":"https://api.github.com/users/caesarxuchao/followers","following_url":"https://api.github.com/users/caesarxuchao/following{/other_user}","gists_url":"https://api.github.com/users/caesarxuchao/gists{/gist_id}","starred_url":"https://api.github.com/users/caesarxuchao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caesarxuchao/subscriptions","organizations_url":"https://api.github.com/users/caesarxuchao/orgs","repos_url":"https://api.github.com/users/caesarxuchao/repos","events_url":"https://api.github.com/users/caesarxuchao/events{/privacy}","received_events_url":"https://api.github.com/users/caesarxuchao/received_events","type":"User","site_admin":false},"body":"* Added the orphaning finalizer logic to GC\r\n* Added the generic finalizer logic to the APIServer\r\n* Added the logic that handles DeleteOptions.OrphanDependents to the APIServer\r\n\r\nDesign doc is at https://github.com/kubernetes/kubernetes/blob/master/docs/proposals/garbage-collection.md\r\n\r\n@lavalamp  @gmarek @kubernetes/sig-api-machinery 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