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From "Tianying Chang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7818) add region level metrics readReqeustCount and writeRequestCount
Date Mon, 04 Mar 2013 17:39:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592394#comment-13592394

Tianying Chang commented on HBASE-7818:

The unit test on my dev VM box always exit with "unable to create new native thread" at the
end of the unit test suite, even when my patch is not there. I am trying to fix my dev VM
to run the unit test, at the same time I am trying to find another machine that I can run
the full unit test on.
> add region level metrics readReqeustCount and writeRequestCount 
> ----------------------------------------------------------------
>                 Key: HBASE-7818
>                 URL: https://issues.apache.org/jira/browse/HBASE-7818
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 0.94.4
>            Reporter: Tianying Chang
>            Assignee: Tianying Chang
>            Priority: Minor
>             Fix For: 0.94.7
>         Attachments: HBASE-7818_1.patch, HBASE-7818_2.patch, HBASE-7818.patch
> Request rate at region server level can help identify the hot region server. But it will
be good if we can further identify the hot regions on that region server. That way, we can
easily find out unbalanced regions problem. 
> Currently, readRequestCount and writeReqeustCount per region is exposed at webUI. It
will be more useful to expose it through hadoop metrics framework and/or JMX, so that people
can see the history when the region is hot.
> I am exposing the existing readRequestCount/writeRequestCount into the dynamic region
level metrics framework. I am not changing/exposing it as rate because our openTSDB is taking
the raw data of read/write count, and apply rate function to display the rate already. 

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