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Posted to issues@hbase.apache.org by "Rahul Kumar (Jira)" <ji...@apache.org> on 2021/04/22 13:53:00 UTC
[jira] [Commented] (HBASE-25524) Region Servers should give some
indication that short-circuit reads are configured properly and working
[ https://issues.apache.org/jira/browse/HBASE-25524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17329133#comment-17329133 ]
Rahul Kumar commented on HBASE-25524:
-------------------------------------
Hey [~ndimiduk] . Thinking over the approach to validate SCR (short-circuit read). Couple of options that came into my mind, but facing some limitation with those.
1. Do a test read from RS and check if the read was SCR ?
> Is there a way to always read a sample data which are always local to the host ?
2. Try writing data locally and then read the same data to confirm SCR ?
> Even if we write a test data to local, we can't be fully sure it will be there in local at the time of reading.
Do you see any better way that I am not able to see here ? Thanks
> 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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