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https://issues.apache.org/jira/browse/HBASE-7633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559080#comment-13559080
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Elliott Clark commented on HBASE-7633:
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In 0.94 there's:
* callQueueLen
In trunk there are a few more metrics:
* numCallsInGeneralQueue
* numCallsInPriorityQueue
* numCallsInReplicationQueue
While the don't tell you how many threads are currently running they do hint at
if things are backing up.
> 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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