binlijin created HBASE-16691:
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             Summary: optimize KeyOnlyFilter
                 Key: HBASE-16691
                 URL: https://issues.apache.org/jira/browse/HBASE-16691
             Project: HBase
          Issue Type: Improvement
            Reporter: binlijin
            Priority: Minor


In KeyOnlyFilter#transformCell will return a KeyOnlyCell that have no value or 
has valueLength as value, current will copy all row keys into a new byte[] and 
new a KeyValue, we can eliminate the copy and have a wrap KeyOnlyCell that 
ignore the cell's value.



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