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https://issues.apache.org/jira/browse/FLINK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15416731#comment-15416731
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ASF GitHub Bot commented on FLINK-4366:
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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 <wuchong...@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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