Github user arunmahadevan commented on a diff in the pull request: https://github.com/apache/storm/pull/2233#discussion_r130429097 --- Diff: storm-client/src/jvm/org/apache/storm/streams/PairStream.java --- @@ -380,6 +383,25 @@ return partitionBy(KEY).updateStateByKeyPartition(stateUpdater); } + /** + * group the values of this stream with the values having the same key from the other stream. + * <p> + * Note: The parallelism of this stream is carried forward to the joined stream. --- End diff -- carried forward to the co-grouped stream.
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