[
https://issues.apache.org/jira/browse/FLINK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417423#comment-15417423
]
ASF GitHub Bot commented on FLINK-4366:
---------------------------------------
Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2354
Something like `NonParallelSingleOutputStreamOperator` but that's quite a
mouthful. (`SingleOutputStreamOperator` is already too long for my taste ...).
Or maybe `NonParallelStreamOperator`.
Maybe we could have it like you initially proposed but not named
`allWindow` and in such a way that you cannot switch it back. For example:
`SingleOutputStreamOperator.forceNonParallel()` that would set an internal flag
that can never be unset from the outside again.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
