Anoop Sam John commented on HBASE-16659:

Go for it. Test fails seems not at all related. Thanks for the find and patch

> Use CellUtil.createFirstOnRow instead of KeyValueUtil.createFirstOnRow in 
> some places. 
> ---------------------------------------------------------------------------------------
>                 Key: HBASE-16659
>                 URL: https://issues.apache.org/jira/browse/HBASE-16659
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: binlijin
>            Assignee: binlijin
>            Priority: Minor
>             Fix For: 2.0.0
>         Attachments: HBASE-16659-master.patch, HBASE-16659-master_v2.patch, 
> HBASE-16659-master_v2.patch
> CellUtil.createFirstOnRow is more effective than 
> KeyValueUtil.createFirstOnRow, because there is no byte[] copy.
> 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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