code: @Override
    public void prefetchToken(final File tokenFile, final Props props, final Logger logger)
        throws HadoopSecurityManagerException {
      final String userToProxy = props.getString(JobProperties.USER_TO_PROXY);
  
      logger.info("Getting hadoop tokens based on props for " + userToProxy);
      doPrefetch(tokenFile, props, logger, userToProxy);
    }
docs: /*
  Gets hadoop tokens for a user to run mapred/hive jobs on a secured cluster