code: public static ConfigBuilder configure(Job job) {
      job.setInputFormatClass(DatasetKeyInputFormat.class);
      Configuration conf = Hadoop.JobContext.getConfiguration.invoke(job);
      return new ConfigBuilder(conf);
    }
docs: Configures the {@code Job} to use the {@code DatasetKeyInputFormat} and
  returns a helper to add further configuration.
  
  @param job the {@code Job} to configure
  
  @since 0.15.0