code: public static GrpcServerBuilder forAddress(String hostName, SocketAddress address,
        AlluxioConfiguration conf) {
      return new GrpcServerBuilder(hostName, address, null, conf);
    }
docs: Create an new instance of {@link GrpcServerBuilder} with authentication support.
  
  @param hostName the host name
  @param address the address
  @param conf Alluxio configuration
  @return a new instance of {@link GrpcServerBuilder}