[jira] [Commented] (KAFKA-13872) Partitions are truncated when leader is replaced

["Luke Chen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-13872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17532002#comment-17532002 ] 

Luke Chen commented on KAFKA-13872:
-----------------------------------

[~fvisconte] , thanks for reporting the issue. But I think this is the expected behavior, isn't it? We always take the logs in partition leader as source of truth. I'd like to know what your expected behavior is in this case. Thanks.

> Partitions are truncated when leader is replaced
> ------------------------------------------------
>
>                 Key: KAFKA-13872
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13872
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 2.7.2
>            Reporter: Francois Visconte
>            Priority: Major
>         Attachments: extract-2022-05-04T15_50_34.110Z.csv
>
>
> Sample setup:
>  * a topic with one partition and RF=3
>  * a producer using acks=1
>  * min.insync.replicas to 1
>  * 3 brokers 1,2,3
>  * Preferred leader of the partition is brokerId 0
>  
> Steps to reproduce the issue
>  * Producer keeps producing to the partition, leader is brokerId=0
>  * At some point, replicas 1 and 2 are falling behind and removed from the ISR
>  * The leader broker 0 has an hardware failure
>  * Partition transition to offline
>  * This leader is replaced with a new broker with an empty disk and the same broker id 0
>  * Partition transition from offline to online with leader 0, ISR = 0
>  * Followers see the leader offset is 0 and decide to truncate their partitions to 0, ISR=0,1,2
>  * At this point all the topic data has been removed from all replicas and partition size drops to 0 on all replicas
> Attached some of the relevant logs. I can provide more logs if necessary



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