Add cache access pattern statistics and report hot blocks/keys
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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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