code: @SuppressWarnings("unchecked")
    public Class<? extends InputFormat<?,?>> getInputFormatClass() 
       throws ClassNotFoundException {
      return (Class<? extends InputFormat<?,?>>) 
        conf.getClass(INPUT_FORMAT_CLASS_ATTR, TextInputFormat.class);
    }
docs: Get the {@link InputFormat} class for the job.
  
  @return the {@link InputFormat} class for the job.