binlijin created HBASE-16659:

             Summary: Minor improvement in ReversedRegionScannerImpl
                 Key: HBASE-16659
             Project: HBase
          Issue Type: Improvement
            Reporter: binlijin
            Priority: Minor

Current in ReversedRegionScannerImpl#nextRow, to get the previous row to seek, 
it use KeyValueUtil.createFirstOnRow which will have two copy, the first copy 
is copy to a tmp byte[], the second copy is in KeyValue. We can use 
CellUtil.createFirstOnRow which will have no copy.

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