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Posted to jira@kafka.apache.org by "Lucas Brutschy (Jira)" <ji...@apache.org> on 2022/11/22 15:06:00 UTC
[jira] [Assigned] (KAFKA-14415) ThreadCache is getting slower with every additional state store
[ https://issues.apache.org/jira/browse/KAFKA-14415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lucas Brutschy reassigned KAFKA-14415:
--------------------------------------
Assignee: Lucas Brutschy
> ThreadCache is getting slower with every additional state store
> ---------------------------------------------------------------
>
> Key: KAFKA-14415
> URL: https://issues.apache.org/jira/browse/KAFKA-14415
> Project: Kafka
> Issue Type: Bug
> Reporter: Lucas Brutschy
> Assignee: Lucas Brutschy
> Priority: Major
>
> There are a few lines in `ThreadCache` that I think should be optimized. `sizeBytes` is called at least once, and potentially many times in every `put` and is linear in the number of caches (= number of state stores, so typically proportional to number of tasks). That means, with every additional task, every put gets a little slower. The throughput is 30% higher if replace it by constant time update…
> Compare the throughput of TIME_ROCKS on trunk (green graph):
> [http://kstreams-benchmark-results.s3-website-us-west-2.amazonaws.com/experiments/stateheavy-3-5-3-4-0-51b7eb7937-jenkins-20221113214104-streamsbench/]
> This is the throughput of TIME_ROCKS when a constant time `sizeBytes` implementation is used:
> [http://kstreams-benchmark-results.s3-website-us-west-2.amazonaws.com/experiments/stateheavy-3-5-LUCASCOMPARE-lucas-20221122140846-streamsbench/]
> So the throughput is ~20% higher.
> The same seems to apply for the MEM backend (initial throughput >8000 instead of 6000), however, I cannot run the same benchmark here because the memory is filled too quickly.
> [http://kstreams-benchmark-results.s3-website-us-west-2.amazonaws.com/experiments/stateheavy-3-5-LUCASSTATE-lucas-20221121231632-streamsbench/]
>
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