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https://issues.apache.org/jira/browse/IMPALA-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17430242#comment-17430242
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Joe McDonnell commented on IMPALA-10971:
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Good find! Thanks for filing this bug.
> Data cache metrics count error when LIRS is enabled
> ---------------------------------------------------
>
> Key: IMPALA-10971
> URL: https://issues.apache.org/jira/browse/IMPALA-10971
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 4.0.0
> Reporter: Ye Zihao
> Assignee: Joe McDonnell
> Priority: Minor
> Attachments: image-2021-10-18-14-15-52-422.png
>
>
> When LIRS is enabled, impala-server.io-mgr.remote-data-cache-total-bytes may
> give a wrong value because of INSTANT EVICTIONS. When INSTANT EVICTIONS
> occur, the total bytes decreases due to EvictedEntry, and no corresponding
> increase due to failure of insert, so the total bytes becomes smaller and
> smaller, or even negative.
> !image-2021-10-18-14-15-52-422.png!
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