private void setReloadableGuardrails(Configuration conf) {
    rowSizeWarnThreshold =
      conf.getInt(HConstants.BATCH_ROWS_THRESHOLD_NAME, HConstants.BATCH_ROWS_THRESHOLD_DEFAULT);
    rejectRowsWithSizeOverThreshold =
      conf.getBoolean(REJECT_BATCH_ROWS_OVER_THRESHOLD, DEFAULT_REJECT_BATCH_ROWS_OVER_THRESHOLD);
    maxScannerResultSize = conf.getLong(HConstants.HBASE_SERVER_SCANNER_MAX_RESULT_SIZE_KEY,
      HConstants.DEFAULT_HBASE_SERVER_SCANNER_MAX_RESULT_SIZE);
  }
Scan data in a table.
@param controller the RPC controller
@param request    the scan request
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java