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https://issues.apache.org/jira/browse/HBASE-7633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562861#comment-13562861
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Joey Echeverria commented on HBASE-7633:
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I still think a direct metric would be useful here. The issue where I saw this
was a slowly dying disk caused a few region servers to slow way, way down. The
client application was hammering HBase with new threads trying to write with no
back pressure. The writers eventually exhausted the IPC threads on the region
servers which blocked incoming reads. This situation would have been a bit more
graceful if we could have alerted on the IPC threads getting exhausted.
> 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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