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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17353) Cache famLen in OffheapKeyValue
Date Wed, 21 Dec 2016 05:04:58 GMT
ramkrishna.s.vasudevan created HBASE-17353:
----------------------------------------------

             Summary: Cache famLen in OffheapKeyValue
                 Key: HBASE-17353
                 URL: https://issues.apache.org/jira/browse/HBASE-17353
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 2.0.0
            Reporter: ramkrishna.s.vasudevan
            Assignee: ramkrishna.s.vasudevan
            Priority: Minor
             Fix For: 2.0.0


WE need to discuss here. Already we had a TODO here. But this comes again after offheap memstore
is committed in trunk. 
Attaching a screenshot to show the impact. True that these changes won't have a direct impact
on the final perf but at micro level they would have. 
In case of KeyValue it is just retrieving a byte from the byte[] (o(1) access).
But here we need to access the memory to retrive that one byte thought it is Unsafe. 



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