public alluxio.grpc.CommandOrBuilder getCommandOrBuilder() {
    return command_ == null ? alluxio.grpc.Command.getDefaultInstance() : command_;
  }
public alluxio . grpc . CommandOrBuilder getCommandOrBuilder ( ) { return command_ == null ? alluxio . grpc . Command . getDefaultInstance ( ) : command_ ; }
<code>optional .alluxio.grpc.Command command = 1;</code>