[jira] [Updated] (KAFKA-15414) remote logs get deleted after partition reassignment

["Francois Visconte (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-15414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francois Visconte updated KAFKA-15414:
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    Attachment: Screenshot 2023-09-12 at 13.53.07.png

> remote logs get deleted after partition reassignment
> ----------------------------------------------------
>
>                 Key: KAFKA-15414
>                 URL: https://issues.apache.org/jira/browse/KAFKA-15414
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Luke Chen
>            Assignee: Kamal Chandraprakash
>            Priority: Blocker
>             Fix For: 3.6.0
>
>         Attachments: Screenshot 2023-09-12 at 13.53.07.png, image-2023-08-29-11-12-58-875.png
>
>
> it seems I'm reaching that codepath when running reassignments on my cluster and segment are deleted from remote store despite a huge retention (topic created a few hours ago with 1000h retention).
> It seems to happen consistently on some partitions when reassigning but not all partitions.
> My test:
> I have a test topic with 30 partition configured with 1000h global retention and 2 minutes local retention
> I have a load tester producing to all partitions evenly
> I have consumer load tester consuming that topic
> I regularly reset offsets to earliest on my consumer to test backfilling from tiered storage.
> My consumer was catching up consuming the backlog and I wanted to upscale my cluster to speed up recovery: I upscaled my cluster from 3 to 12 brokers and reassigned my test topic to all available brokers to have an even leader/follower count per broker.
> When I triggered the reassignment, the consumer lag dropped on some of my topic partitions:
> !image-2023-08-29-11-12-58-875.png|width=800,height=79! Screenshot 2023-08-28 at 20 57 09
> Later I tried to reassign back my topic to 3 brokers and the issue happened again.
> Both times in my logs, I've seen a bunch of logs like:
> [RemoteLogManager=10005 partition=uR3O_hk3QRqsn4mPXGFoOw:loadtest11-17] Deleted remote log segment RemoteLogSegmentId
> {topicIdPartition=uR3O_hk3QRqsn4mPXGFoOw:loadtest11-17, id=Mk0chBQrTyKETTawIulQog}
> due to leader epoch cache truncation. Current earliest epoch: EpochEntry(epoch=14, startOffset=46776780), segmentEndOffset: 46437796 and segmentEpochs: [10]
> Looking at my s3 bucket. The segments prior to my reassignment have been indeed deleted.



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