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https://issues.apache.org/jira/browse/HBASE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-11573:
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Attachment: Screen Shot 2014-07-22 at 5.17.27 PM.png
Looks like this (the mean and stddev only show up if non-null because
combinedblockcache does not update its own stats when evictions... calls
through to hosted block caches).
> 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
> Attachments: 11573.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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