Ziyun Fu created KAFKA-21166:
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Summary: 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
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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