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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11573) Report age on eviction
Date Wed, 23 Jul 2014 00:20:38 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-11573:
--------------------------

    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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