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https://issues.apache.org/jira/browse/KAFKA-16226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayank Shekhar Narula updated KAFKA-16226:
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    Attachment: Screenshot 2024-02-01 at 11.06.36.png

> Java client: Performance regression in Trogdor benchmark with high partition 
> counts
> -----------------------------------------------------------------------------------
>
>                 Key: KAFKA-16226
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16226
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 3.7.0, 3.6.1
>            Reporter: Mayank Shekhar Narula
>            Assignee: Mayank Shekhar Narula
>            Priority: Major
>              Labels: kip-951
>             Fix For: 3.6.2, 3.8.0, 3.7.1
>
>         Attachments: Screenshot 2024-02-01 at 11.06.36.png
>
>
> Background
> https://issues.apache.org/jira/browse/KAFKA-15415 implemented optimisation in 
> java-client to skip backoff period if client knows of a newer leader, for 
> produce-batch being retried.
> What changed
> The implementation introduced a regression noticed on a trogdor-benchmark 
> running with high partition counts(36000!).
> With regression, following metrics changed on the produce side.
>  # record-queue-time-avg: increased from 20ms to 30ms.
>  # request-latency-avg: increased from 50ms to 100ms.
> How it happened
> As can be seen from the original 
> [PR|[https://github.com/apache/kafka/pull/14384],] 
> RecordAccmulator.partitionReady() & drainBatchesForOneNode() started using 
> synchronised method Metadata.currentLeader(). This has led to increased 
> synchronization between KafkaProducer's application-thread that call send(), 
> and background-thread that actively send producer-batches to leaders. 
> See lock profiles that clearly show increased synchronisation in KAFKA-15415 
> PR(highlighted in {color:#de350b}Red{color}) Vs baseline. Note the 
> synchronisation is much worse for paritionReady() in this benchmark as its 
> called for each partition, and it has 36k partitions!
> Fix



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