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https://issues.apache.org/jira/browse/KAFKA-18688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-18688.
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Fix Version/s: 4.0.1
4.1.0
Resolution: Fixed
> Uniform homogeneous assignment is not always stable
> ---------------------------------------------------
>
> Key: KAFKA-18688
> URL: https://issues.apache.org/jira/browse/KAFKA-18688
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: Sean Quah
> Priority: Minor
> Fix For: 4.0.1, 4.1.0
>
>
> The uniform homogeneous assignor assigns partitions to group members which
> have identical subscriptions. When the number of partitions is not divisible
> by the number of members, some members will end up with 1 more partition than
> others.
> The assignor iterates over members and chooses the first {{partitions %
> members}} members to have the extra partition. Even when the existing
> assignment is balanced, the assignor can decide that a different set of
> members should have the extra partition, due to the iteration order.
> This means that when a static member is replaced and the assignment is
> recomputed, it may gain or lose a single partition.
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