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https://issues.apache.org/jira/browse/KAFKA-15414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17759792#comment-17759792
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Satish Duggana commented on KAFKA-15414:
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Rebalance will be tried out after the targeted changes are in and make sure
that works fine. Will notify here so that the mentioned scenario can be tried
out with the target changes.
> 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
> Priority: Major
> Attachments: 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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