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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3632) ability to record the block cache hit ratio for the last few minutes
Date Mon, 14 Mar 2011 08:07:29 GMT
ability to record the block cache hit ratio for the last few minutes
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                 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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