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Posted to jira@kafka.apache.org by "David Arthur (Jira)" <ji...@apache.org> on 2022/12/01 18:57:00 UTC

[jira] [Commented] (KAFKA-14433) Clear all yammer metrics when test harnesses clean up

    [ https://issues.apache.org/jira/browse/KAFKA-14433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17642123#comment-17642123 ] 

David Arthur commented on KAFKA-14433:
--------------------------------------

I did some investigation on this. Running {{./gradlew -PmaxParallelForks=1 :core:integrationTest}} to better capture the leaked objects, I took a heap dump after 30 minutes. Several KafkaRaftManager instances were hanging around.

 

 

!image-2022-12-01-13-53-57-886.png!

 

This anonymous function "Partition$$anonfun$4" is one of the metric's gauge closures.

 

!image-2022-12-01-13-55-35-488.png!

> Clear all yammer metrics when test harnesses clean up
> -----------------------------------------------------
>
>                 Key: KAFKA-14433
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14433
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Colin McCabe
>            Priority: Major
>         Attachments: image-2022-12-01-13-53-57-886.png, image-2022-12-01-13-55-35-488.png
>
>
> We should clear all yammer metrics from the yammer singleton when the integration test harnesses clean up. This would avoid memory leaks in tests that have a lot of test cases.



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