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https://issues.apache.org/jira/browse/KAFKA-18263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-18263.
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Fix Version/s: 4.0.0
3.9.1
Resolution: Fixed
> Group lock must be acquired when reverting static membership rejoin
> -------------------------------------------------------------------
>
> Key: KAFKA-18263
> URL: https://issues.apache.org/jira/browse/KAFKA-18263
> Project: Kafka
> Issue Type: Bug
> Reporter: David Jacot
> Assignee: David Jacot
> Priority: Major
> Fix For: 4.0.0, 3.9.1
>
>
> When a static member rejoins the group, the group state is rewritten to the
> partition in order to persist the change. If the write fails, the change is
> reverted. However, this is done without acquiring the group lock.
> This is only try in the old group coordinator. The new one does not suffer
> from this issue.
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