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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7633) Add a metric that tracks the current number of used RPC threads on the regionservers
Date Mon, 21 Jan 2013 21:24:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559114#comment-13559114
] 

stack commented on HBASE-7633:
------------------------------

bq. ...translates into tuning hbase.regionserver.handler.count.  Do we have a good example
of interpreting that value?

Not really other than if they are backed up frequently and we're not blocked on cpu or io,
then bump them up (Is this for another issue [~fwiffo]?)  Thanks boss.


                
> Add a metric that tracks the current number of used RPC threads on the regionservers
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-7633
>                 URL: https://issues.apache.org/jira/browse/HBASE-7633
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Joey Echeverria
>            Assignee: Elliott Clark
>
> One way to detect that you're hitting a "John Wayne" disk[1] would be if we could see
when region servers exhausted their RPC handlers. This would also be useful when tuning the
cluster for your workload to make sure that reads or writes were not starving the other operations
out.
> [1] http://hbase.apache.org/book.html#bad.disk

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