Stephan Ewen created FLINK-9809:

             Summary: Support setting CoLocation constraints on the DataStream 
                 Key: FLINK-9809
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             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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