Github user arunmahadevan commented on a diff in the pull request:
    --- Diff: storm-client/src/jvm/org/apache/storm/streams/ ---
    @@ -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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