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https://issues.apache.org/jira/browse/HBASE-9731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790038#comment-13790038
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Lars Hofhansl commented on HBASE-9731:
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As for 0.96+. It seems there we throw an exception to tell the client to back
off, and thus this no longer easily collectible at the server; so it's probably
OK not to have this metric in 0.96+.
> updatesBlockedSeconds RegionServer metric should not be a histogram
> -------------------------------------------------------------------
>
> Key: HBASE-9731
> URL: https://issues.apache.org/jira/browse/HBASE-9731
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.13
>
> Attachments: 9731.txt
>
>
> I just noticed that updatesBlockedSeconds is declared as a histogram (in
> 0.94), which makes little sense (neither mean, nor any percentiles are
> useful, as it is an every increasing number).
> This metric measures the total time the region server has blocked writes due
> to flushes that could not proceed due to too many store files... In that it
> should be a number. Unless there are objections I will make this so.
> Also, it looks like this metric was lost in 0.96 ([~eclark], [~stack], fyi).
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