* another implementation but also forces AbstractFutureState to be able to do the
         * same—hence the try-catch here.
         *
         * (Really, we're fortunate that breaking AtomicReferenceFieldUpdater doesn't break _even
         * more_ things.)
         */
        helper = new SynchronizedHelper();
      }
    }
    ATOMIC_HELPER = helper;

   * the spliterator implementation.
   */
  // @IgnoreJRERequirement is not necessary because this compiles down to a constant.
  // (which is fortunate because Animal Sniffer doesn't look for @IgnoreJRERequirement on fields)
  static final int SPLITERATOR_CHARACTERISTICS =
      Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED;

  ImmutableCollection() {}

              () -> {
                service.shutdown();
                try {
                  // We'd like to log progress and failures that may arise in the
                  // following code, but unfortunately the behavior of logging
                  // is undefined in shutdown hooks.
                  // This is because the logging code installs a shutdown hook of its

// This method mutates blk in the process.
func (tr *Reader) readOldGNUSparseMap(hdr *Header, blk *block) (sparseDatas, error) {
	// Make sure that the input format is GNU.
	// Unfortunately, the STAR format also has a sparse header format that uses
	// the same type flag but has a completely different layout.
	if blk.getFormat() != FormatGNU {
		return nil, ErrHeader
	}
	hdr.Format.mayOnlyBe(FormatGNU)

  private void readObject(ObjectInputStream in) throws InvalidObjectException {
    throw new InvalidObjectException("Use SerializationProxy");
  }

  /**
   * The actual object that gets serialized. Unfortunately, readResolve() doesn't get called when a
   * circular dependency is present, so the proxy must be able to behave as the map itself.
   */

                        /*
                         * Apparently once a successful NTLMSSP login occurs, the
                         * server will return "Access denied" even if a logoff is
                         * sent. Unfortunately calling disconnect() doesn't always
                         * actually shutdown the connection before other threads
                         * have committed themselves (e.g. InterruptTest example).

    //
    // HttpUrl is quite lenient with what characters it accepts. In particular, characters like '{'
    // and '"' are permitted but unlikely to occur in real-world URLs. Unfortunately we can't just
    // lock it down due to URL templating: "http://{env}.{dc}.example.com".
    UrlComponentEncodingTester
      .newInstance()
      .nonPrintableAscii(Encoding.FORBIDDEN)

   * upon deserialization. An instance of this class is fit for use by the writeReplace of
   * LocalManualCache.
   *
   * <p>Unfortunately, readResolve() doesn't get called when a circular dependency is present, so
   * the proxy must be able to behave as the cache itself.
   */
  private static class ManualSerializationProxy<K, V> extends ForwardingCache<K, V>

Unfortunately, there is a much rarer second possible failure mode: the replication controller gets renamed to the old name, but there is a duplicated set of pods in the cluster. kubectl will not report an error since it thinks its job is done.

CSI type or it has migrated annotation, when it's deleted, the PersisentVolume controller won't changes its phase to the Failed state. 
  
  With this patch, the external provisioner can remove the finalizer in next reconcile loop. Unfortunately if the provious existing pv has the Failed state, this patch won't take effort. It requires users to remove finalizer. ([#126043](https://github.com/kubernetes/kubernetes/pull/126043), [@carlory](https://github.com/carlory)) [SIG Apps and Storage]...