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https://issues.apache.org/jira/browse/FLINK-8560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380275#comment-16380275
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ASF GitHub Bot commented on FLINK-8560:
---------------------------------------
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`.
> add KeyedProcessFunction to expose the key in onTimer() and other methods
> -------------------------------------------------------------------------
>
> Key: FLINK-8560
> URL: https://issues.apache.org/jira/browse/FLINK-8560
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.4.0
> Reporter: Jürgen Thomann
> Assignee: Bowen Li
> Priority: Major
> Fix For: 1.5.0
>
>
> Currently it is required to store the key of a keyBy() in the processElement
> method to have access to it in the OnTimerContext.
> This is not so good as you have to check in the processElement method for
> every element if the key is already stored and set it if it's not already set.
> A possible solution would adding OnTimerContext#getCurrentKey() or a similar
> method. Maybe having it in the open() method could maybe work as well.
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Getting-Key-from-keyBy-in-ProcessFunction-tt18126.html
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