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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9731) updatesBlockedSeconds RegionServer metric should not be a histogram
Date Wed, 09 Oct 2013 05:19:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790039#comment-13790039
] 

Lars Hofhansl commented on HBASE-9731:
--------------------------------------

I validated the change with a JMX viewer.

> 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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