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https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996620#comment-15996620
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ASF GitHub Bot commented on FLINK-5720:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3816#discussion_r114756625
--- Diff:
flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/KeyedStream.scala
---
@@ -183,7 +183,10 @@ class KeyedStream[T, K](javaStream: KeyedJavaStream[T,
K]) extends DataStream[T]
* Creates a new [[DataStream]] by folding the elements of this
DataStream
* using an associative fold function and an initial value. An
independent
* aggregate is kept per key.
+ *
+ * @deprecated will be removed in a future version
*/
+ @Deprecated
--- End diff --
I don't know, actually. It seems actual (random) code on GitHub only has it
in the annotation:
https://github.com/ReactiveX/RxScala/blob/0.x/src/main/scala/rx/lang/scala/Observable.scala#L4876
> Deprecate "Folding" in all of DataStream API
> --------------------------------------------
>
> Key: FLINK-5720
> URL: https://issues.apache.org/jira/browse/FLINK-5720
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Reporter: Aljoscha Krettek
> Assignee: Chesnay Schepler
> Priority: Blocker
> Fix For: 1.3.0
>
>
> Folding is an operation that cannot be done incrementally in a distributed
> way and that also cannot be done on merging windows. Now that we have
> {{AggregatingState}} and aggregate operations we should deprecate folding in
> the APIs and deprecate {{FoldingState}}.
> I suggest to remove folding completely in Flink 2.0
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