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https://issues.apache.org/jira/browse/KAFKA-20342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tomasz resolved KAFKA-20342.
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Resolution: Not A Problem
> Kafka Clients performance degradation
> -------------------------------------
>
> Key: KAFKA-20342
> URL: https://issues.apache.org/jira/browse/KAFKA-20342
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 4.0.0, 4.2.0, 4.1.1
> Environment: Apache Kafka 4.2.0 (on docker)
> Java 25
> Reporter: Tomasz
> Priority: Critical
>
> We've observed significant performance degradation on using kafka with
> kafka-clients 3.9.2 and 4.X.X. I've created project which is using
> kafka-clients to send/receive messages from kafka (link below) with 10000
> messages. There is no difference on using different serializers (tested on
> string and json).
> +Kafka-clients: 3.9.2+
> Kafka perf run completed for mode DIRECT: PerfRunResult[requestedCount=10000,
> repliedCount=10000, timeoutCount=0, totalDurationMs=31669,
> averageRoundTripMs=3.0808, maxRoundTripMs=99]
> +Kafka-clients: 4.1.1+
> Kafka perf run completed for mode DIRECT: PerfRunResult[requestedCount=10000,
> repliedCount=10000, timeoutCount=0, totalDurationMs=167634,
> averageRoundTripMs=16.6516, maxRoundTripMs=140]
> +Kafka-clients: 4.2.0+
> Kafka perf run completed for mode DIRECT: PerfRunResult[requestedCount=10000,
> repliedCount=10000, timeoutCount=0, totalDurationMs=129510,
> averageRoundTripMs=12.8591, maxRoundTripMs=68]
> I though it was related with spring-kafka but after additional tests (without
> spring usage), we've confirmed this is related to the kafka-clients and we
> got the same confirmation from Spring developers.
> Spring-kafka issue for the information:
> [https://github.com/spring-projects/spring-kafka/issues/4358]
> Project used for tests:
> [https://github.com/infoShare/spring-kafka-perf]
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