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From "stack (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 20:57:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006628#comment-13006628
] 

stack commented on HBASE-3632:
------------------------------

@Todd You talking about displaying graphs using jrobin?  (Seems like its *GPL though -- dang)

> 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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