[jira] [Resolved] (HBASE-28246) Expose region cached size over JMX metrics and report in the RS UI

["Wellington Chevreuil (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-28246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wellington Chevreuil resolved HBASE-28246.
------------------------------------------
    Resolution: Fixed

Thanks for reviewing it, [~psomogyi]! Merged into master, branch-3 and branch-2.

> Expose region cached size over JMX metrics and report in the RS UI
> ------------------------------------------------------------------
>
>                 Key: HBASE-28246
>                 URL: https://issues.apache.org/jira/browse/HBASE-28246
>             Project: HBase
>          Issue Type: Improvement
>          Components: BucketCache
>    Affects Versions: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.6, 4.0.0-alpha-1
>            Reporter: Wellington Chevreuil
>            Assignee: Wellington Chevreuil
>            Priority: Major
>             Fix For: 3.0.0-beta-1, 4.0.0-alpha-1
>
>         Attachments: Screenshot 2023-12-06 at 22.58.17.png
>
>
> With large file based bucket cache, the prefetch executor can take long time to complete cache all of the dataset. It would be useful to report how much % of regions data is already cached, in order to give an idea of how much work prefetch executor has done.
> This PRs adds jmx metrics for region cache % and also reports the same in the RS UI "Store File Metrics" tab as below:
> !Screenshot 2023-12-06 at 22.58.17.png|width=658,height=114!



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