code: public Configuration initializeConf(String[] keys,
        Configuration conf, FileSystem fs) throws IOException {
      Configuration newConf = new Configuration(conf);
      if (fs == null) {
        fs = FileSystem.get(conf);
      }
      String suffix = fs.getUri().getAuthority();
      for (String key: keys) {
        String value = conf.get(key + "." + suffix);
        if (value != null) {
          newConf.set(key, value);
        }
      }
      return newConf;
    }
docs: Initialize the config based on the given Filesystem