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https://issues.apache.org/jira/browse/FLINK-12122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16957642#comment-16957642
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Flavio Pompermaier commented on FLINK-12122:
--------------------------------------------
I discovered this issue only today (since I was convinced that Flink was
distributing tasks with this strategy..I wasn't aware of the changes introduced
by Flip-6).
This is also what is still reported by the docs (look at the image
https://ci.apache.org/projects/flink/flink-docs-release-1.9/fig/slots_parallelism.svg
within
https://ci.apache.org/projects/flink/flink-docs-stable/ops/config.html).
Maybe that doc section should be updated too
> 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
> Labels: pull-request-available
> Attachments: image-2019-05-21-12-28-29-538.png,
> image-2019-05-21-13-02-50-251.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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