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From "Mikhail Bautin (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5602) Add cache access pattern statistics and report hot blocks/keys
Date Tue, 20 Mar 2012 01:11:38 GMT
Add cache access pattern statistics and report hot blocks/keys
--------------------------------------------------------------

                 Key: HBASE-5602
                 URL: https://issues.apache.org/jira/browse/HBASE-5602
             Project: HBase
          Issue Type: Improvement
            Reporter: Mikhail Bautin


In many practical applications it would be very useful to know how well utilized the block
cache is, i.e. how many times we actually access a block once it gets into cache. This would
also allow to evaluate cache-on-write on flush. In addition, we need to keep track of and
report some set of hottest block in cache, and possibly even hottest keys. This would allow
to diagnose "hot-row" problems in real time.

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