code: @Deprecated
    public Writable[] call(Writable[] params, InetSocketAddress[] addresses)
      throws IOException {
      return call(params, addresses, null, null);
    }
docs: Makes a set of calls in parallel.  Each parameter is sent to the
  corresponding address.  When all values are available, or have timed out
  or errored, the collected results are returned in an array.  The array
  contains nulls for calls that timed out or errored.
  @deprecated Use {@link #call(Writable[], InetSocketAddress[], Class, UserGroupInformation)} instead