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https://issues.apache.org/jira/browse/HBASE-18144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054993#comment-16054993
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Jerry He commented on HBASE-18144:
----------------------------------

The  write-lock attempt is blocked (not able to acquire the lock), and this 
attempt also blocks other read attempts on the same row it looks like.

> Forward-port the old exclusive row lock; there are scenarios where it 
> performs better
> -------------------------------------------------------------------------------------
>
>                 Key: HBASE-18144
>                 URL: https://issues.apache.org/jira/browse/HBASE-18144
>             Project: HBase
>          Issue Type: Bug
>          Components: Increment
>    Affects Versions: 1.2.5
>            Reporter: stack
>            Assignee: stack
>             Fix For: 2.0.0, 1.3.2, 1.2.7
>
>         Attachments: DisorderedBatchAndIncrementUT.patch, 
> HBASE-18144.master.001.patch
>
>
> Description to follow.



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