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https://issues.apache.org/jira/browse/KAFKA-21166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ziyun Fu reassigned KAFKA-21166:
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Assignee: Ziyun Fu
> sticky assignor maybe never converge
> ------------------------------------
>
> Key: KAFKA-21166
> URL: https://issues.apache.org/jira/browse/KAFKA-21166
> Project: Kafka
> Issue Type: Improvement
> Reporter: Ziyun Fu
> Assignee: Ziyun Fu
> Priority: Major
>
> While running the fuzz test with other base seeds to task sticky assignor, I
> found some cases where standbys never be stable.
> If we take the output of {{{}assign(){}}}, feed it back as the members'
> current assignment and call {{assign() }}again, some scenarios never reach a
> fixed point, cause a few standby tasks land on member1, move to member2 in
> the next round, come back to member1 in the round after that, and so on
> indefinitely.
> Active tasks are not affected, only standbys.
> If this keep happening, every time there's a rebalance, member1 and member2
> will need to swap the standby and it's a extra cost for rebalance.
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