@Override
    public void setup(final Reducer<ObjectWritable, ObjectWritable, ObjectWritable, ObjectWritable>.Context context) {
        final Configuration apacheConfiguration = ConfUtil.makeApacheConfiguration(context.getConfiguration());
        KryoShimServiceLoader.applyConfiguration(apacheConfiguration);
        this.mapReduce = MapReduce.createMapReduce(HadoopGraph.open(apacheConfiguration), apacheConfiguration);
        this.mapReduce.workerStart(MapReduce.Stage.REDUCE);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/process/computer/HadoopReduce.java