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https://issues.apache.org/jira/browse/HBASE-3102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919718#action_12919718
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Nicolas Spiegelberg commented on HBASE-3102:
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A patch will soon be available for this. I coined the long-running duration a
'marathon'. New compaction stats & all min/max stats expire after the
marathon. We plan to set it to 1hr, however the default is currently coded to
never expire. This will allow existing clients to upgrade without changing
existing functionality. However, a good case could be made for defaulting this
to something like 1hr, so it's one less config knob the user has to explicitly
set/find. Thoughts?
> 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
>
>
> 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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