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https://issues.apache.org/jira/browse/KAFKA-14808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shenglong Zhang reassigned KAFKA-14808:
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Assignee: Shenglong Zhang
> Partition becomes leaderless when new partition reassignment removes the
> adding replica
> ---------------------------------------------------------------------------------------
>
> Key: KAFKA-14808
> URL: https://issues.apache.org/jira/browse/KAFKA-14808
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Affects Versions: 3.4.0
> Reporter: Shenglong Zhang
> Assignee: Shenglong Zhang
> Priority: Major
>
> If there is ongoing partition reassignment and any adding replica has been
> elected as leader (due to preferred leader election or other reason), the
> partition will immediately becomes leaderless on receiving a new partition
> reassignment which removes that adding replica.
> 1) partition-0 has replicas [0, 2]
> 2) partition-0 is being reassigned to [1, 0, 2], and somehow this
> reassignment is stuck (e.g. broker 2 is down).
> 3) Preferred leader election is triggered, and broker 1 is elected as leader.
> 4) When submitting a new partition reassignment to [2, 0, 3], which remove
> broker 1 and add broker 3, partition will become leaderless.
>
>
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