[jira] [Created] (FLINK-12122) Spread out tasks evenly across all available registered TaskManagers

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-12122:
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             Summary: 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: 1.7.2, 1.6.4, 1.8.0
            Reporter: Till Rohrmann
             Fix For: 1.7.3, 1.9.0, 1.8.1


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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