code: private static FormatBundle<DatasetKeyOutputFormat> outputBundle(Configuration conf) {
      FormatBundle<DatasetKeyOutputFormat> bundle = FormatBundle
          .forOutput(DatasetKeyOutputFormat.class);
      for (Map.Entry<String, String> entry : conf) {
        bundle.set(entry.getKey(), entry.getValue());
      }
      return bundle;
    }
docs: Builds a FormatBundle for DatasetKeyOutputFormat by copying a temp config.
  
  All properties will be copied from the temporary configuration
  
  @param conf A Configuration that will be copied
  @return a FormatBundle with the contents of conf