@Override
    public void map(final NullWritable key, final VertexWritable value, final Mapper<NullWritable, VertexWritable, ObjectWritable, ObjectWritable>.Context context) throws IOException, InterruptedException {
        this.mapEmitter.setContext(context);
        this.mapReduce.map(ComputerGraph.mapReduce(value.get()), this.mapEmitter);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/process/computer/HadoopMap.java