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https://issues.apache.org/jira/browse/HBASE-24205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17124446#comment-17124446
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Michael Stack commented on HBASE-24205:
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I can see value in how many reads come from memstore vs files.
Can you say more about what read counts we currently do? We do it on a Region
basis. You'd here add counting per Store which I could see of use. Would like
to see how new metrics relate to the old counters (for example, in PR, seems
like the Store counting might not agee w/ how Region counts are done -- e.g.
null Gets are counting in one case but not in the other). Then I wonder if
these Store-based accounts lose value if they are summed at the Table level
dropping their Region context. Thanks Ram.
> Create metric to know the number of reads that happens from memstore
> --------------------------------------------------------------------
>
> Key: HBASE-24205
> URL: https://issues.apache.org/jira/browse/HBASE-24205
> Project: HBase
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 3.0.0-alpha-1
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.0, 2.2.6
>
> Attachments: screenshot.png, screenshot_tablevscf.png
>
>
> A metric to identify number of reads that were served from memstore (atleast
> if the gets can be accounted for) then it gives a value addition to know if
> among the reads how much was targeted at the most recent data.
> Currently the existing metric framework at region level should be enough but
> we can also add a metric per store level. That will be more granular.
> We can also expose this via HbTop.
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