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https://issues.apache.org/jira/browse/HBASE-6974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475971#comment-13475971
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Lars Hofhansl commented on HBASE-6974:
--------------------------------------
In any case the #2 should be covered by a different metric, I think.
#1 (and #3) are caused by the IO system not being able to keep up. #2 is caused
by insufficient memory (which may also in part stem from the IO system being
too slow, but it also may have other reasons).
> 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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