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Posted to dev@kafka.apache.org by "Guozhang Wang (Jira)" <ji...@apache.org> on 2022/04/26 18:50:00 UTC

[jira] [Resolved] (KAFKA-13647) RocksDb metrics 'number-open-files' is not correct

     [ https://issues.apache.org/jira/browse/KAFKA-13647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-13647.
-----------------------------------
    Resolution: Incomplete

I resolved the ticket for now as incomplete, since the streams code cannot alone fix the issue, since it's on the rocksDB side to fix.

> RocksDb metrics 'number-open-files' is not correct
> --------------------------------------------------
>
>                 Key: KAFKA-13647
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13647
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 3.0.0
>            Reporter: Sylvain Le Gouellec
>            Priority: Major
>         Attachments: image-2022-02-07-16-06-25-304.png, image-2022-02-07-16-06-39-821.png, image-2022-02-07-16-06-53-164.png
>
>
> We were looking at RocksDB metrics and noticed that the {{number-open-files}} metric behaves like a counter, rather than a gauge. 
> Looking at the code, we think there is a small error in the type of metric for that specific mbean (should be a value metric rather than a sum metric).
> See [ https://github.com/apache/kafka/blob/ca5d6f9229c170beb23809159113037f05a1120f/streams/src/main/java/org/apache/kafka/streams/state/internals/metrics/RocksDBMetrics.java#L482|https://github.com/apache/kafka/blob/99b9b3e84f4e98c3f07714e1de6a139a004cbc5b/streams/src/main/java/org/apache/kafka/streams/state/internals/metrics/RocksDBMetrics.java#L482]



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