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https://issues.apache.org/jira/browse/KAFKA-8841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928932#comment-16928932
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Lucas Bradstreet commented on KAFKA-8841:
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PR is available at [https://github.com/apache/kafka/pull/7324]
> Optimize Partition.maybeIncrementLeaderHW
> -----------------------------------------
>
> Key: KAFKA-8841
> URL: https://issues.apache.org/jira/browse/KAFKA-8841
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jason Gustafson
> Assignee: Jose Armando Garcia Sancio
> 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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