public static DataSet<Tuple2<Long, Double>> constructPlan(DataSet<Tuple2<Long, Double>> initialData, int numIterations) { DeltaIteration<Tuple2<Long, Double>, Tuple2<Long, Double>> iteration = initialData.iterateDelta(initialData, numIterations, 0); DataSet<Tuple2<Long, Double>> delta = iteration.getSolutionSet() .join(iteration.getWorkset().flatMap(new Duplicator())).where(0).equalTo(0).with(new SummingJoin()).name(JOIN_1) .groupBy(0).aggregate(Aggregations.MIN, 1).map(new Expander()) .join(iteration.getSolutionSet()).where(0).equalTo(0).with(new SummingJoinProject()).name(JOIN_2); DataSet<Tuple2<Long, Double>> changes = delta.groupBy(0).aggregate(Aggregations.SUM, 1); DataSet<Tuple2<Long, Double>> result = iteration.closeWith(delta, changes); return result; }