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https://issues.apache.org/jira/browse/HIVE-21422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16789572#comment-16789572
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Oliver Draese commented on HIVE-21422:
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Added pull request for this patch: https://github.com/apache/hive/pull/563/files
> 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.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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