private void rejectIfInStandByState(HRegion region) throws DoNotRetryIOException {
    if (shouldRejectRequestsFromClient(region)) {
      throw new DoNotRetryIOException(
        region.getRegionInfo().getRegionNameAsString() + " is in STANDBY state.");
    }
  }
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