  /**
   * Try to add a no-checksum anchor to our shared memory slot.
   *
   * It is only possible to add this anchor when the block is mlocked on the Datanode.
   * The DataNode will not munlock the block until the number of no-checksum anchors
   * for the block reaches zero.
   *
   * This method does not require any synchronization.
   *
   * @return     True if we successfully added a no-checksum anchor.
   */
  /**
   * Try to add a no-checksum anchor to our shared memory slot.
   *
   * It is only possible to add this anchor when the block is mlocked on the Datanode.
   * The DataNode will not munlock the block until the number of no-checksum anchors
   * for the block reaches zero.
   *
   * This method does not require any synchronization.
   *
   * @return     True if we successfully added a no-checksum anchor.
   */ | ShortCircuitReplica.java