Github user shghatge commented on the pull request: https://github.com/apache/flink/pull/892#issuecomment-128866366 I made some of the changes mentioned. But there was a problem in replacing the getTriplets() and flatMap. When I use this method private static final class ReduceN implements NeighborsFunctionWithVertexValue<Long,Tuple2<Double, HashSet<Long>> ,Double, Tuple3<Long, Long, Double>> { @Override public void iterateNeighbors( Vertex<Long, Tuple2<Double, HashSet<Long>>> vertex, Iterable<Tuple2<Edge<Long, Double>, Vertex<Long, Tuple2<Double, HashSet<Long>>>>> neighbors, Collector<Tuple3<Long, Long, Double>> out) throws Exception { for(Tuple2<Edge<Long, Double>, Vertex<Long, Tuple2<Double, HashSet<Long>>>> neighbor : neighbors) { HashSet<Long> intersection = vertex.getValue().f1; intersection.retainAll(neighbor.f1.getValue().f1); for(long l : intersection) { System.out.println(neighbor.f1.getId()+" "+l); out.collect(new Tuple3<Long, Long, Double>(neighbor.f1.getId(), l, vertex.getValue().f0)); } } } } For some reason the
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