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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11573) Report age on eviction
Date Wed, 23 Jul 2014 16:03:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071888#comment-14071888
] 

Andrew Purtell commented on HBASE-11573:
----------------------------------------

+1 here too. Will attempt a backport to 0.98 after it goes in on master.

> 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, 11573v4.txt, 11573v5.txt, 11573v7.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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