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https://issues.apache.org/jira/browse/FLINK-8407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16337780#comment-16337780
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Aljoscha Krettek commented on FLINK-8407:
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The culprit is actually this piece of code:
https://github.com/apache/flink/blob/e8edbcafae6561423d0f8f321d2b64805f09357b/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/SingleOutputStreamOperator.java#L409
Setting a connection type, i.e. a partitioning or whatnot, should not return a
{{SingleOutputStreamOperator}}. In this case the check in {{DataStream.scala}}
will also work properly.
> Setting the parallelism after a partitioning operation should be forbidden
> --------------------------------------------------------------------------
>
> Key: FLINK-8407
> URL: https://issues.apache.org/jira/browse/FLINK-8407
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Reporter: Xingcan Cui
> Assignee: Xingcan Cui
> Priority: Major
>
> Partitioning operations ({{shuffle}}, {{rescale}}, etc.) for a {{DataStream}}
> create new {{DataStreams}}, which allow the users to set parallelisms for
> them. However, the {{PartitionTransformations}} in these returned
> {{DataStreams}} will only add virtual nodes, whose parallelisms could not be
> specified, in the execution graph. We should forbid users to set the
> parallelism after a partitioning operation since they won't actually work.
> Also the corresponding documents should be updated.
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