private Message execServiceOnRegion(HRegion region,
    final ClientProtos.CoprocessorServiceCall serviceCall) throws IOException {
    // ignore the passed in controller (from the serialized call)
    ServerRpcController execController = new ServerRpcController();
    return region.execService(execController, serviceCall);
  }
Atomically bulk load several HFiles into an open region
@return true if successful, false is failed but recoverably (no action)
@throws ServiceException if failed unrecoverably
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java