code: public static void addAdditionalNamenodesToPropsFromMRJob(Props props, Logger log) {
      String additionalNamenodes =
          (new Configuration()).get(MAPREDUCE_JOB_OTHER_NAMENODES);
      if (additionalNamenodes != null && additionalNamenodes.length() > 0) {
        log.info("Found property " + MAPREDUCE_JOB_OTHER_NAMENODES +
            " = " + additionalNamenodes + "; setting additional namenodes");
        HadoopJobUtils.addAdditionalNamenodesToProps(props, additionalNamenodes);
      }
    }
docs: The same as {@link #addAdditionalNamenodesToProps}, but assumes that the
  calling job is MapReduce-based and so uses the
  {@link #MAPREDUCE_JOB_OTHER_NAMENODES} from a {@link Configuration} object
  to get the list of additional namenodes.
  
  @param props Props to add the new Namenode URIs to.
  @see #addAdditionalNamenodesToProps(Props, String)