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https://issues.apache.org/jira/browse/FLINK-8560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16382032#comment-16382032
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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_r171566773
--- Diff:
flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/KeyedStream.scala
---
@@ -66,9 +66,9 @@ class KeyedStream[T, K](javaStream: KeyedJavaStream[T,
K]) extends DataStream[T]
* function, this function can also query the time and set timers. When
reacting to the firing
* of set timers the function can directly emit elements and/or
register yet more timers.
*
- * @param processFunction The [[ProcessFunction]] that is called for
each element
- * in the stream.
+ * @param processFunction The [[ProcessFunction]] that is called for
each element in the stream.
--- End diff --
Please also add that the user now should use the new `KeyedProcessFunction`
instead.
> 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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