DELETE request of a replication controller or a replicaset becomes asynchronous by default. The object will continue to exist in the key-value store for some time. The API server will set its metadata.deletionTimestamp, add the "orphan" finalizer to its metadata.finalizers. The object will be deleted from the key-value store after the garbage collector orphans its dependents. Please refer to this [user-guide](http://kubernetes.io/docs/user-guide/garbage-collector/) for more information regarding the garbage...

     * point, Finalizer can stop running
     */
    if (!finalizableReferenceClass.getName().equals(FINALIZABLE_REFERENCE)) {
      throw new IllegalArgumentException("Expected " + FINALIZABLE_REFERENCE + ".");
    }

    Finalizer finalizer = new Finalizer(finalizableReferenceClass, queue, frqReference);
    String threadName = Finalizer.class.getName();
    Thread thread = null;

- Fixed a bug where `Services` using finalizers may hold onto `ClusterIP` and/or `NodePort` allocated resources for longer than expected if the finalizer is removed using the status subresource. ([#120623](https://github.com/kubernetes/kubernetes/pull/120623), [@aojea](https://github.com/aojea))

- Only declare Job as finished after removing all Pod finalizers to avoid orphan Pods ([#119163](https://github.com/kubernetes/kubernetes/pull/119163), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps and Testing]

* Fixed controller manager crash by making it tolerant to discovery errors.([#49767](https://github.com/kubernetes/kubernetes/pull/49767), [@deads2k](https://github.com/deads2k))

* When a namespace is being deleted and spec.finalizers are still being processed, stop returning a 409 conflict error and instead return the object as we would during metadata.finalizer processing. ([#84122](https://github.com/kubernetes/kubernetes/pull/84122), [@smarterclayton](https://github.com/smarterclayton))

* The OwnerReferencesPermissionEnforcement admission plugin now requires `update` permission on the `finalizers` subresource of the referenced owner in order to set `blockOwnerDeletion` on an owner reference. ([#49133](https://github.com/kubernetes/kubernetes/pull/49133), [@deads2k](https://github.com/deads2k))

- Fixed a bug in apiserver storage that could cause just-added finalizers to be ignored immediately following a delete request, leading to premature deletion. ([#77619](https://github.com/kubernetes/kubernetes/pull/77619), [@caesarxuchao](https://github.com/caesarxuchao))

- Only declare Job as finished after removing all Pod finalizers to avoid orphan Pods ([#119160](https://github.com/kubernetes/kubernetes/pull/119160), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps and Testing]

- Fix job tracking with finalizers for more than 500 pods, ensuring all finalizers are removed before counting the Pod. ([#104666](https://github.com/kubernetes/kubernetes/pull/104666), [@alculquicondor](https://github.com/alculquicondor))