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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3632) ability to record the block cache hit ratio for the last few minutes
Date Mon, 14 Mar 2011 20:07:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006609#comment-13006609

Todd Lipcon commented on HBASE-3632:

Might be interesting to consider using something like jrobin for metrics like this - so we
can get these metrics at various granularities.

> ability to record the block cache hit ratio for the last few minutes
> --------------------------------------------------------------------
>                 Key: HBASE-3632
>                 URL: https://issues.apache.org/jira/browse/HBASE-3632
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
> In the curent code, the block cache hit ratio is calculated by using the total number
of cache hits since the regin server was rebooted. This means that this metric does not reflect
the short term changes that occur in the workload; the longer the region reserver is alive
slower is the rate of change of this metric. 
> I propose that this metric reflect the cache hit ratio for the work processed in the
most recent 10 minutes, is that reasonable?

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