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Date: Wed, 23 Jul 2014 03:34:38 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12729034.1406072155698.26525.1406086478959@arcas>
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Subject: [jira] [Updated] (HBASE-11573) Report age on eviction
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     [ https://issues.apache.org/jira/browse/HBASE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: 11573v3.txt

Thanks [~ndimiduk].  I'll take that as a +1.

v3 changes age to seconds from ms.

> 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, 11573v3.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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