@GwtIncompatible
    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
    stream.defaultReadObject();
    @SuppressWarnings("unchecked")
    // reading data stored by writeObject
    Comparator<? super E> comparator = (Comparator<? super E>) requireNonNull(stream.readObject());
    deserializationReplacement = new TreeMultiset<>(comparator);

#### Encryption at Rest
* [alpha] Encrypt secrets stored in etcd. For more information, see [Securing a Cluster](https://kubernetes.io/docs/tasks/administer-cluster/securing-a-cluster/) and [Encrypting data at rest](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/).

#### Node Authorization

    checkArgument(is6to4Address(ip), "Address '%s' is not a 6to4 address.", toAddrString(ip));

    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 2, 6));
  }

  /**
   * A simple immutable data class to encapsulate the information to be found in a Teredo address.
   *
   * <p>All of the fields in this class are encoded in various portions of the IPv6 address as part

   * across different segments.
   *
   * The page replacement algorithm's data structures are kept casually consistent with the map. The
   * ordering of writes to a segment is sequentially consistent. An update to the map and recording
   * of reads may not be immediately reflected on the algorithm's data structures. These structures
   * are guarded by a lock and operations are applied in batches to avoid lock contention. The

     *
     * @param pager The search log pager containing filter criteria and pagination settings
     * @return List of search log entries or aggregated data based on the log type
     */
    public List<?> getSearchLogList(final SearchLogPager pager) {
        final EsPagingResultBean<?> list;
        if (SearchLogPager.LOG_TYPE_USERINFO.equalsIgnoreCase(pager.logType)) {

   * "key-grouped" iteration order described in the class documentation.
   *
   * <p>Despite the method name, this method attempts to avoid actually copying the data when it is
   * safe to do so. The exact circumstances under which a copy will or will not be performed are
   * undocumented and subject to change.
   *

     * @param target the target path
     * @param targetDomain the target domain
     * @param targetHost the target host
     * @param root the DFS root
     * @param path the DFS path
     * @return the DFS referral data or null if not found
     * @throws SmbAuthException if authentication fails
     */
    protected DfsReferralDataInternal getReferral(final CIFSContext tf, final SmbTransportInternal trans, final String target,

([#60301](https://github.com/kubernetes/kubernetes/pull/60301), [@tnozicka](https://github.com/tnozicka))

* ConfigMap objects now support binary data via a new `binaryData` field. When using `kubectl create configmap --from-file`, files containing non-UTF8 data will be placed in this new field in order to preserve the non-UTF8 data. Note that kubectl's `--append-hash` feature doesn't take `binaryData` into account. Use of this feature requires 1.10+ apiserver and kubelets. ([#57938](h...

Before updating to 1.6, you are strongly recommended to back up your etcd data.
Please consult the installation procedure you are using (kargo, kops, kube-up,
kube-aws, kubeadm etc) for specific advice.

1.6 encourages etcd3, and switching from etcd2 to etcd3 involves a full
migration of data between different storage engines.  You must stop the API

* Add --no-negcache flag to kube-dns to prevent caching of NXDOMAIN responses. ([#66036](https://github.com/kubernetes/kubernetes/pull/66036), [@prameshj](https://github.com/prameshj))
* fix data loss issue if using existing azure disk with partitions in disk mount  ([#63270](https://github.com/kubernetes/kubernetes/pull/63270), [@andyzhangx](https://github.com/andyzhangx))