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https://issues.apache.org/jira/browse/HIVE-21422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16796256#comment-16796256
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Oliver Draese commented on HIVE-21422:
--------------------------------------

Added a patch version (2) which removes all checkstyle warnings.

> Add metrics to LRFU cache policy
> --------------------------------
>
>                 Key: HIVE-21422
>                 URL: https://issues.apache.org/jira/browse/HIVE-21422
>             Project: Hive
>          Issue Type: Improvement
>          Components: llap
>    Affects Versions: 4.0.0
>            Reporter: Oliver Draese
>            Assignee: Oliver Draese
>            Priority: Major
>              Labels: llap
>             Fix For: 4.0.0
>
>         Attachments: HIVE-21422.1.patch, HIVE-21422.2.patch, HIVE-21422.patch
>
>
> The LRFU cache policy for the LLAP data cache doesn't  provide enough insight 
> to figure out, what is cached and why something might get evicted. This 
> ticket is used to add Hadoop metrics 2 information (accessible via JMX) to 
> the LRFU policy, providing following information:
>  * How much memory is cached for data buffers
>  * How much memory is cached for meta data buffers
>  * How large is the min-heap of the cache policy
>  * How long is the eviction short list (linked list)
>  * How much memory is currently "locked" (buffers with positive reference 
> count) and therefore in use by a query
> These new counters are found in the MX bean, following this path:
> Hadoop/LlapDaemon/LowLevelLrfuCachePolicy-<hostname>
>  



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