core/src/main/java/com/twitter/elephantbird/mapreduce/input/MultiInputFormat.java
public static void setInputFormatClass(Class<?> clazz, Job job) {
    job.setInputFormatClass(MultiInputFormat.class);
    setClassConf(clazz, HadoopCompat.getConfiguration(job));
  }
public static void setInputFormatClass(Class<?> clazz, Job job) {
    job.setInputFormatClass(MultiInputFormat.class);
    setClassConf(clazz, HadoopCompat.getConfiguration(job));
  }
Sets jobs input format to {@link MultiInputFormat} and stores
supplied clazz's name in job configuration. This configuration is
read on the remote tasks to initialize the input format correctly.