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https://issues.apache.org/jira/browse/KAFKA-8841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-8841.
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Resolution: Fixed
> Optimize Partition.maybeIncrementLeaderHW
> -----------------------------------------
>
> Key: KAFKA-8841
> URL: https://issues.apache.org/jira/browse/KAFKA-8841
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jason Gustafson
> Assignee: Lucas Bradstreet
> Priority: Major
>
> We've observed a noticeable cost in `Partition.maybeIncrementLeaderHW` during
> profiling. Basically just all the unnecessary collection copies and
> iterations over the replica set. Since this is on the hot path for handling
> follower fetches, we should probably put some effort into optimizing this.
> A couple ideas:
> # Don't do all those copies.
> # Checking whether hw needs incrementing is not necessary unless an end
> offset actually changed
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