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https://issues.apache.org/jira/browse/FLINK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422922#comment-15422922
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ASF GitHub Bot commented on FLINK-4366:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/2354
> 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
> Fix For: 1.2.0
>
>
> 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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