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https://issues.apache.org/jira/browse/HBASE-7633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563260#comment-13563260
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Joey Echeverria commented on HBASE-7633:
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Yes, if we added the docs for that with the info that Elliot just provided for
how to interpret the results, that'd be perfect.
> 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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