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https://issues.apache.org/jira/browse/FLINK-2550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14706476#comment-14706476
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Aljoscha Krettek commented on FLINK-2550:
-----------------------------------------

But this becomes difficult when you have a reduce function, and also when you 
are pre-reducing and don't know yet what the window info will be, because this 
you only know once the window triggers.

> Rework DataStream API
> ---------------------
>
>                 Key: FLINK-2550
>                 URL: https://issues.apache.org/jira/browse/FLINK-2550
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>             Fix For: 0.10
>
>
> After discussions on the mailing list we arrived at a consensus to rework the 
> streaming API to make it more fool-proof and easier to use. The resulting 
> design document is available here: 
> https://cwiki.apache.org/confluence/display/FLINK/Streams+and+Operations+on+Streams



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