code: public alluxio.grpc.RequestType getType() {
      alluxio.grpc.RequestType result = alluxio.grpc.RequestType.valueOf(type_);
      return result == null ? alluxio.grpc.RequestType.ALLUXIO_BLOCK : result;
    }
docs: <code>optional .alluxio.grpc.block.RequestType type = 1;</code>