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https://issues.apache.org/jira/browse/HBASE-9899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412948#comment-15412948
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Guanghao Zhang commented on HBASE-9899:
---------------------------------------

Thanks [~stack]. But the master branch need the addendum patch too...... And it 
has been included in patch for branch-1.

> for idempotent operation dups, return the result instead of throwing conflict 
> exception
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-9899
>                 URL: https://issues.apache.org/jira/browse/HBASE-9899
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Guanghao Zhang
>             Fix For: 2.0.0, 1.3.0, 1.4.0
>
>         Attachments: HBASE-9899-addendum.patch, HBASE-9899-branch-1.patch, 
> HBASE-9899-branch-1.patch, HBASE-9899-branch-1.patch, HBASE-9899-v1.patch, 
> HBASE-9899-v2.patch, HBASE-9899-v3.patch, HBASE-9899-v3.patch, 
> HBASE-9899-v4.patch, HBASE-9899-v4.patch
>
>
> After HBASE-3787, we could store mvcc in operation context, and use it to 
> convert the modification request into read on dups instead of throwing 
> OperationConflictException.
> MVCC tracking will have to be aware of such MVCC numbers present. Given that 
> scanners are usually relatively short-lived, that would prevent low watermark 
> from advancing for quite a bit more time



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