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From "Enis Soztutar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3614) Expose per-region request rate metrics
Date Wed, 18 Apr 2012 01:17:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256122#comment-13256122
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Enis Soztutar commented on HBASE-3614:
--------------------------------------

This is fine for JMX, but these per-region metrics will be exposed via the Hadoop metrics
system as well right? If so, the large number of regions and the fact that regions are dynamic
would make it useless for ganglia (or similar). So, I think we should either not expose them
through the hadoop metrics, but do itJMX only, or make per-region metrics configurable IMO.
                
> Expose per-region request rate metrics
> --------------------------------------
>
>                 Key: HBASE-3614
>                 URL: https://issues.apache.org/jira/browse/HBASE-3614
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>            Reporter: Gary Helmling
>            Assignee: Elliott Clark
>            Priority: Minor
>         Attachments: HBASE-3614-0.patch, HBASE-3614-1.patch, HBASE-3614-2.patch, Screen
Shot 2012-04-17 at 2.41.27 PM.png
>
>
> We currently export metrics on request rates for each region server, and this can help
with identifying uneven load at a high level. But once you see a given server under high load,
you're forced to extrapolate based on your application patterns and the data it's serving
what the likely culprit is.  This can and should be much easier if we just exported request
rate metrics per-region on each server.
> Dynamically updating the metrics keys based on assigned regions may pose some minor challenges,
but this seems a very valuable diagnostic tool to have available.

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