[jira] [Assigned] (KAFKA-14808) Partition becomes leaderless when new partition reassignment removes the adding replica

["Shenglong Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-14808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shenglong Zhang reassigned KAFKA-14808:
---------------------------------------

    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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