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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3102) Enhance HRegionServerMetrics for Long-running Stats
Date Wed, 20 Oct 2010 17:54:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923066#action_12923066
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Nicolas Spiegelberg commented on HBASE-3102:
--------------------------------------------

Oh, I saw MetricsRate but only skimmed over the other class.  So that would definitely save
some grief.  It's still a decent bit of copy-paste + testing, so I think I'll save that for
later refactoring.  I'm adding Master LogSplit metrics that will follow this same paradigm,
so I'll update the patch when I have that added.

How does 'hbase.extendedperiod' sound?  That should be a little more explicit. 

> Enhance HRegionServerMetrics for Long-running Stats
> ---------------------------------------------------
>
>                 Key: HBASE-3102
>                 URL: https://issues.apache.org/jira/browse/HBASE-3102
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>             Fix For: 0.90.0
>
>         Attachments: HBASE-3102_90.patch
>
>
> A useful metric to observe track is compaction count + duration. Since compactions are
long running and only happen infrequently, the avg/opcount stats are should be reset longer
than the default polling period (5 sec). In addition to 'hbase.period', we should allow a
different duration after which long-running metrics should expire. This would also fix our
existing metrics problem where min/max stats are never reset until the process is restarted/upgraded.

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