ASF GitHub Bot commented on FLINK-9809:

Github user aljoscha commented on the issue:

    Looks good +1

> 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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