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https://issues.apache.org/jira/browse/HBASE-22623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902619#comment-16902619
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Andrew Purtell commented on HBASE-22623:
----------------------------------------

I think we’re just having a bit of a miscommunication. I read Duo’s comment as 
a suggestion to move the current WALObserver method over to RegionObserver. 
However I believe that the wrong approach because it breaks both interfaces. At 
least with the current patch we are binary compatible and source incompatible 
only in RegionObserver. I plan to commit it tomorrow 

> Add RegionObserver coprocessor hook for preWALAppend
> ----------------------------------------------------
>
>                 Key: HBASE-22623
>                 URL: https://issues.apache.org/jira/browse/HBASE-22623
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Geoffrey Jacoby
>            Assignee: Geoffrey Jacoby
>            Priority: Major
>             Fix For: 3.0.0, 1.5.0, 2.3.0
>
>
> While many coprocessor hooks expose the WALEdit to implementing coprocs, 
> there aren't any that expose the WALKey before it's created and added to the 
> WALEntry. 
> It's sometimes useful for coprocessors to be able to edit the WALKey, for 
> example to add extended attributes using the fields to be added in 
> HBASE-22622. 



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