code: public alluxio.grpc.WriteRequestCommandOrBuilder getCommandOrBuilder() {
      if (valueCase_ == 1) {
         return (alluxio.grpc.WriteRequestCommand) value_;
      }
      return alluxio.grpc.WriteRequestCommand.getDefaultInstance();
    }
docs: <code>optional .alluxio.grpc.block.WriteRequestCommand command = 1;</code>