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https://issues.apache.org/jira/browse/KAFKA-5083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Onur Karaman resolved KAFKA-5083.
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Resolution: Fixed
This has been fixed in KAFKA-5642.
> always leave the last surviving member of the ISR in ZK
> -------------------------------------------------------
>
> Key: KAFKA-5083
> URL: https://issues.apache.org/jira/browse/KAFKA-5083
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Onur Karaman
> Assignee: Onur Karaman
>
> Currently we erase ISR membership if the replica to be removed from the ISR
> is the last surviving member of the ISR and unclean leader election is
> enabled for the corresponding topic.
> We should investigate leaving the last replica in ISR in ZK, independent of
> whether unclean leader election is enabled or not. That way, if people
> re-disabled unclean leader election, we can still try to elect the leader
> from the last in-sync replica.
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