Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/2233#discussion_r133946525
--- 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 = ...
+
+// another stream of (key, value) pairs e.g. (k1, x1), (k1, x2), (k3, x3)
+PairStream<String, Double> stream2 = ...
--- End diff --
can be `PairStream<String, String> stream1` to match with above comment.
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