Till Rohrmann commented on FLINK-12122:

Yes, I didn't find time to continue working on this issue. I think it would be 
best to unassign me from this issue. The community is looking into making the 
{{SlotManager}} or some part of pluggable to have different strategies for 
container allocation, request to slot matching and container release. There 
should be soon a design document on the dev ML. We should then make sure that 
the design allows to support spreading tasks out.

> Spread out tasks evenly across all available registered TaskManagers
> --------------------------------------------------------------------
>                 Key: FLINK-12122
>                 URL: https://issues.apache.org/jira/browse/FLINK-12122
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Coordination
>    Affects Versions: 1.6.4, 1.7.2, 1.8.0
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>            Priority: Major
>         Attachments: image-2019-05-21-12-28-29-538.png, 
> image-2019-05-21-13-02-50-251.png
> With Flip-6, we changed the default behaviour how slots are assigned to 
> {{TaskManages}}. Instead of evenly spreading it out over all registered 
> {{TaskManagers}}, we randomly pick slots from {{TaskManagers}} with a 
> tendency to first fill up a TM before using another one. This is a regression 
> wrt the pre Flip-6 code.
> I suggest to change the behaviour so that we try to evenly distribute slots 
> across all available {{TaskManagers}} by considering how many of their slots 
> are already allocated.

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