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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 Sat, 26 Jan 2013 00:57:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563231#comment-13563231
] 

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

Looks like we don't doc callQueueLen in refguide, not currently.  If we added it Joey, would
that do to close this issue?  (Elliott, what is the metric's full name and I'll add the doc.)
                
> 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
>          Components: metrics
>            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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