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https://issues.apache.org/jira/browse/HBASE-6974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475981#comment-13475981
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Anoop Sam John commented on HBASE-6974:
---------------------------------------

Yes Lars, you are correct, the reasons for #1(#3) and #2 will be normally 
different... And seperate metric can be better.. In some way user should be 
able to know why the updates are blocked.. :)
                
> Metric for blocked updates
> --------------------------
>
>                 Key: HBASE-6974
>                 URL: https://issues.apache.org/jira/browse/HBASE-6974
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Michael Drzal
>            Priority: Critical
>             Fix For: 0.94.3, 0.96.0
>
>
> When the disc subsystem cannot keep up with a sustained high write load, a 
> region will eventually block updates to throttle clients.
> (HRegion.checkResources).
> It would be nice to have a metric for this, so that these occurrences can be 
> tracked.

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