[jira] [Commented] (FLINK-4366) Enforce parallelism=1 For AllWindowedStream

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15416731#comment-15416731 ] 

ASF GitHub Bot commented on FLINK-4366:
---------------------------------------

GitHub user wuchong opened a pull request:

    https://github.com/apache/flink/pull/2354

    [FLINK-4366] Enforce parallelism=1 For AllWindowedStream

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    This PR avoid users try to set a parallelism on an all-windowed stream. 
    
    I add an `isAllWindow` field to mark a transformation is  all-windowed. I'm appreciate if there is better solutions. 


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/wuchong/flink FLINK-4366

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/2354.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2354
    
----
commit 79ac99a715ef9bf15de0e5f0cd8080ebc8d278c6
Author: Jark Wu <wu...@alibaba-inc.com>
Date:   2016-08-11T08:04:54Z

    [FLINK-4366] Enforce parallelism=1 For AllWindowedStream

----


> Enforce parallelism=1 For AllWindowedStream
> -------------------------------------------
>
>                 Key: FLINK-4366
>                 URL: https://issues.apache.org/jira/browse/FLINK-4366
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Aljoscha Krettek
>            Assignee: Jark Wu
>
> Right now, it is possible to use {{DataStream.windowAll/timeWindowAll}} and then set a different parallelism afterwards. Flink will silently accept this and spawn the number of parallel operators, only one instance of those will do all the processing, though, since the elements are implicitly keyed by a dummy key.
> We should throw an exception if users try to set a parallelism on an all-windowed stream.



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