Github user arunmahadevan commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2233#discussion_r133946510
  
    --- Diff: docs/Stream-API.md ---
    @@ -276,6 +276,21 @@ PairStream<String, Double> scores = ...
     // list of scores per user in the last window, e.g. ("alice", [10, 11, 
13]), ("bob", [15, 20])
     PairStream<String, Iterable<Integer>> userScores =  
scores.window(...).groupByKey(); 
     ```
    +
    +### <a name="coGroupbykey"></a> coGroupByKey
    +
    +`coGroupByKey` Groups the values of this stream with the values having the 
same key from the other stream.
    +
    +```java
    +// a stream of (key, value) pairs e.g. (k1, v1), (k2, v2), (k2, v3)
    +PairStream<String, Double> stream1 = ...
    --- End diff --
    
    can be `PairStream<String, String> stream1` to match with above comment.


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