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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11573) Report age on eviction
Date Tue, 22 Jul 2014 23:46:39 GMT

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

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

    Attachment: 11573.txt

In UI, show eviction mean age w/ stdev in stats tab.  If blockcaches > 1, show eviction
mean age+stddev per cache.  This stuff only populated on cache eviction.  Reports made when
you ask for them.  Not metrics (yet).

> 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
>
>
> 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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