Github user fhueske commented on the pull request: https://github.com/apache/flink/pull/1553#issuecomment-191752181 Sorry, I forgot a `groupBy()` in my example. It should be ``` DataSet<Tuple2<String, Long>> data = ... DataSet<Tuple2<String, Long>> pData = data.partitionByHash(0); pData.map(new SomeMapFunc()) .output(new DiscardingOutputFormat<Tuple2<String, Integer>>()); pData.groupBy(0) .groupReduce(new SomeCombinableGReduceFunc()) .output(new DiscardingOutputFormat<Tuple2<String, Integer>>()); ```
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