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