High CPU usage when using kafka-clients:3.3.1

[kishorepurushothaman20]

Hi,

We have a Dropwizard app (dropwizard-core:2.1.4) which uses zipkin-core:2.0.16-1 with 'kafka' collector. When using it along kafka-clients:3.3.1 we are able to see a high CPU usage but the same behaviour does not apply when using kafka-clients:3.2.3.
On using a profiler we are able to see a worker thread stuck in Runnable state forever and is not going to the waiting state after the traces are published. The thread goes to Runnable state and stuck there forever when an initial API request hits one of our endpoints. JDK used is Corretto 17.0.5

Below image using,

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>3.3.1</version>
</dependency>

Below image using,

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>3.2.3</version>
</dependency>

Can you help in shedding some light on this or can it be taken as bug?
If it is not a bug can I get some compatibility matrix for dropwizard-zipkin bundle with kafka-clients?

Regards,
Kishore

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove the "stale" label or comment or this will be closed in 14 days.

[kishorepurushothaman20]

Any updates on this issue?

[jplock]

I don't currently use Zipkin or Kafka to know how to replicate this or debug it.

[kishorepurushothaman20]

No fix as of now is it?
Should this be closed then? @jplock