Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/5481#discussion_r171233273
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java
---
@@ -84,18 +86,18 @@
* elements that have the same key.
*
* @param <T> The type of the elements in the Keyed Stream.
- * @param <KEY> The type of the key in the Keyed Stream.
+ * @param <K> The type of the key in the Keyed Stream.
--- End diff --
Revert the renaming from `KEY` to `K`.
---
