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https://issues.apache.org/jira/browse/HBASE-25524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17356565#comment-17356565
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Sean Busbey commented on HBASE-25524:
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We should be able to use the read from FSDataInputStreamWrapper to verify that
the request wasn't served locally at all. We can use that to either do a retry
or make a WARN about the canary being invalid.
> Region Servers should give some indication that short-circuit reads are
> configured properly and working
> -------------------------------------------------------------------------------------------------------
>
> Key: HBASE-25524
> URL: https://issues.apache.org/jira/browse/HBASE-25524
> Project: HBase
> Issue Type: Improvement
> Components: Performance, regionserver, Usability
> Affects Versions: 3.0.0-alpha-1, 2.3.0, 2.4.0
> Reporter: Nick Dimiduk
> Assignee: Rahul Kumar
> Priority: Major
>
> Going through the exercise of confirming short-circuit reads turns out to be
> quite a chore. 2.3.0 added a new metric, but metrics only get tickled when
> there's traffic that happens to use the feature. This is not very convenient
> for an operator who has taken a cluster out of service for maintenance.
> It would be nice if the rs process could perform some test and emitted some
> confirmation of the status of this otherwise transparent feature. After
> confirmation, it could light up a boolean metric value and/or add mention of
> it to the info page.
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