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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1591) Remove window merge before flatten as an optimization
Date Sun, 01 Mar 2015 21:53:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342489#comment-14342489
] 

ASF GitHub Bot commented on FLINK-1591:
---------------------------------------

Github user mbalassi commented on the pull request:

    https://github.com/apache/flink/pull/444#issuecomment-76633206
  
    LGTM, nice feature and surprisingly nice to read.


> Remove window merge before flatten as an optimization
> -----------------------------------------------------
>
>                 Key: FLINK-1591
>                 URL: https://issues.apache.org/jira/browse/FLINK-1591
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Gyula Fora
>            Assignee: Gyula Fora
>
> After a Window Reduce or Map transformation there is always a merge step when the transformation
was parallel or grouped.
> This merge step should be removed when the windowing operator is followed by flatten
to avoid unnecessary bottlenecks in the program.
> This feature should be added as an optimization step to the WindowingOptimizer class.



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