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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8407) Setting the parallelism after a partitioning operation should be forbidden
Date Fri, 26 Jan 2018 13:29:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341053#comment-16341053
] 

ASF GitHub Bot commented on FLINK-8407:
---------------------------------------

Github user xccui commented on the issue:

    https://github.com/apache/flink/pull/5369
  
    Sure. I'll update the PR to make it more appropriate and thanks for your review, @aljoscha.


> 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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