gistfile1.java

 public static class Map extends Mapper<NullWritable, LongWritable, NullWritable, NullWritable> {

        private TitanGraph graph;

        @Override
        public void setup(final Mapper.Context context) throws IOException, InterruptedException {
            this.graph = TitanFactory.open(context.get("titanConfiguration"));
        }

        @Override
        public void map(final NullWritable key, final LongWritable value, final Mapper<NullWritable, LongWritable, NullWritable, NullWritable>.Context context) throws IOException, InterruptedException {
            Vertex vertex = this.graph.getVertex(value.get());
            double pageRank = vertex.getProperty("pageRank");
            pageRank = pageRank / vertex.query().direction(OUT).count()
            for(Vertex neighbor : vertex.getVertices(OUT)) {
              double temp = neighbor.getProperty("pageRank");
              neighbor.setProperty("pageRank", temp+pageRank)
            }
        }

    }