code: private static boolean existsBetterParityFile(
        Codec codec, FileStatus srcStat, Configuration conf) throws IOException {
      for (Codec c : Codec.getCodecs()) {
        if (c.priority > codec.priority) {
          ParityFilePair ppair = ParityFilePair.getParityFile(
              c, srcStat, conf);
          if (ppair != null) {
            return true;
          }
        }
      }
      return false;
    }
docs: Is there a parity file which has a codec with higher priority?