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src-kafka/jmh-benchmarks/src/main/java/org/apache/kafka/jmh

History

Lucas Bradstreet 1675115ec1 MINOR: refactor replica last sent HW updates due to performance regression (#7671) ... This change fixes a performance regression due to follower last seen highwatermark handling introduced in 23beeea. maybeUpdateHwAndSendResponse is expensive for brokers with high partition counts, as it requires a partition and a replica lookup for every partition being fetched. This refactor moves the last seen watermark update into the follower fetch state update where we have already looked up the partition and replica. I've seen cases where maybeUpdateHwAndSendResponse is responsible 8% of CPU usage, not including the responseCallback call that is part of it. I have benchmarked this change with `UpdateFollowerFetchStateBenchmark` and it adds 5ns of overhead to Partition.updateFollowerFetchState, which is a rounding error compared to the current overhead of maybeUpdateHwAndSendResponse. Reviewers: David Arthur <mumrah@gmail.com>, Jason Gustafson <jason@confluent.io>, Ismael Juma <ismael@juma.me.uk>		5 years ago
..
cache	MINOR: Fix integer overflow in LRUCacheBenchmark (#7270)	5 years ago
common	…
fetcher	KAFKA-9048 Pt1: Remove Unnecessary lookup in Fetch Building (#7576)	5 years ago
fetchsession	KAFKA-9039: Optimize ReplicaFetcher fetch path (#7443)	5 years ago
partition	MINOR: refactor replica last sent HW updates due to performance regression (#7671)	5 years ago
producer	…
record	…