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https://issues.apache.org/jira/browse/HBASE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071219#comment-14071219
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Nick Dimiduk commented on HBASE-11573:
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Looks like you missed adding some files to your patch.
This looks really nice! If we're thinking in terms of minutes, maybe ms isn't
the best choice of unit for displaying this info.
> Report age on eviction
> ----------------------
>
> Key: HBASE-11573
> URL: https://issues.apache.org/jira/browse/HBASE-11573
> Project: HBase
> Issue Type: Sub-task
> Components: BlockCache
> Reporter: stack
> Assignee: stack
> Fix For: 0.99.0, 2.0.0
>
> Attachments: 11573.txt, 11573v2.txt, Screen Shot 2014-07-22 at
> 5.17.27 PM.png
>
>
> From the parent issue, Todd reminds us of the old Jim Gray '5 minute rule' on
> whether to cache.
> In master, we were reporting age only it was the inactionable inverse of 'how
> long blocks are staying in the cache'.
> Let me add to our cache stats a histogram of age on eviction and change the
> UI reporting so it is age at eviction (plus stddev). The JSON version has
> percentiles (and if wanted, the old age report of age of items in cache).
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