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https://issues.apache.org/jira/browse/FLINK-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821262#comment-15821262
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Robert Metzger commented on FLINK-5473:
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That would be the best user experience, yes.
> setMaxParallelism() higher than 1 is possible on non-parallel operators
> -----------------------------------------------------------------------
>
> Key: FLINK-5473
> URL: https://issues.apache.org/jira/browse/FLINK-5473
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Robert Metzger
>
> While trying out Flink 1.2, I found out that you can set a maxParallelism
> higher than 1 on a non-parallel operator.
> I think we should have the same semantics as the setParallelism() method.
> Also, when setting a global maxParallelism in the execution environment, it
> will be set as a default value for the non-parallel operator.
> When restoring a savepoint from 1.1, you have to set the maxParallelism to
> the parallelism of the 1.1 job. Non-parallel operators will then also get the
> maxPar set to this value, leading to an error on restore.
> So currently, users restoring from 1.1 to 1.2 have to manually set the
> maxParallelism to 1 for all non-parallel operators.
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