Kamal commented on STORM-2258:

Thanks for reviewing the PR. Modified the PR as per your comments. Please 
review the next iteration.

> Streams api - support CoGroupByKey
> ----------------------------------
>                 Key: STORM-2258
>                 URL: https://issues.apache.org/jira/browse/STORM-2258
>             Project: Apache Storm
>          Issue Type: Sub-task
>            Reporter: Arun Mahadevan
> Group together values with same key from both streams. Similar constructs are 
> supported in beam, spark and flink.
> When called on a Stream of (K, V) and (K, W) pairs, return a new Stream of 
> (K, Seq[V], Seq[W]) tuples
> See also - https://cloud.google.com/dataflow/model/group-by-key

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