code: public static void setInputCQLPageRowSize(Configuration conf, String cqlPageRowSize)
      {
          if (cqlPageRowSize == null)
          {
              throw new UnsupportedOperationException("cql page row size may not be null");
          }
  
          conf.set(INPUT_CQL_PAGE_ROW_SIZE_CONFIG, cqlPageRowSize);
      }
docs: Set the CQL query Limit for the input of this job.
  
  @param conf Job configuration you are about to run
  @param cqlPageRowSize