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Posted to issues@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2017/02/06 13:47:41 UTC

[jira] [Commented] (FLINK-5720) Deprecate "Folding" in all of DataStream API

    [ https://issues.apache.org/jira/browse/FLINK-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854009#comment-15854009 ] 

Stephan Ewen commented on FLINK-5720:
-------------------------------------

+1

I think fold causes a lot of problems internally and blocks many optimizations for size of state and performance.

The {{AggregateFunction}} should be able to subsume all the {{fold()}} use cases.

> 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
>
> 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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