Jason Gustafson created KAFKA-8841:
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Summary: 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
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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