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https://issues.apache.org/jira/browse/KAFKA-19652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18061834#comment-18061834
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Chia-Ping Tsai commented on KAFKA-19652:
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The root cause is related to KAFKA-15583 - "High watermark can only advance if
ISR size is larger than min ISR". The title says it all. The consumer can't
read more data due to the HW, which can't be advanced due to the slow followers
dropping the partition below the min ISR
> Consumer throughput drops by 10 times with Kafka v3.9.0 in ZK mode
> ------------------------------------------------------------------
>
> Key: KAFKA-19652
> URL: https://issues.apache.org/jira/browse/KAFKA-19652
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer
> Affects Versions: 3.9.0
> Reporter: Sharad Garg
> Priority: Blocker
>
> Kafka consumer throughput in best-case drops by ~10 times after upgrading to
> kafka v3.9.0 from v3.5.1. Note that this is in ZK mode and KRAFT migration is
> not done yet.
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