public void setUp() {
   mapReduceDriver =
       new MapReduceDriver<
           NullWritable, FaunusVertex, LongWritable, Holder, NullWritable, FaunusVertex>();
   mapReduceDriver.setMapper(new BackFilterMapReduce.Map());
   mapReduceDriver.setCombiner(new BackFilterMapReduce.Combiner());
   mapReduceDriver.setReducer(new BackFilterMapReduce.Reduce());
 }