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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9809) Support setting CoLocation constraints on the DataStream Transformations
Date Wed, 11 Jul 2018 16:51:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540363#comment-16540363
] 

ASF GitHub Bot commented on FLINK-9809:
---------------------------------------

Github user StephanEwen commented on the issue:

    https://github.com/apache/flink/pull/6309
  
    Thanks, merging once CI is green...


> Support setting CoLocation constraints on the DataStream Transformations
> ------------------------------------------------------------------------
>
>                 Key: FLINK-9809
>                 URL: https://issues.apache.org/jira/browse/FLINK-9809
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.0
>
>
> Flink supports co location constraints for operator placement during scheduling. This
is used internally for iterations, for example, but is not exposed to users.
> I propose to add a way for expert users to set these constraints. As a first step, I
would add them to the {{StreamTransformation}}, which is not part of the public user-facing
classes, but a more internal class in the DataStream API. That way we make this initially
a hidden feature and can gradually expose it more prominently when we agree that this would
be a good idea.



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