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https://issues.apache.org/jira/browse/HBASE-8355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649018#comment-13649018
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Lars Hofhansl edited comment on HBASE-8355 at 5/4/13 5:29 AM:
--------------------------------------------------------------

Hmm... Yes. So at least I got that part of my original patch right. :)

I seem to recall that I had a good reason for returning null in 
BaseRegionObserver, but since I can't remember why now and there appears to be 
no good reason for it I agree with Jesse.

                
      was (Author: lhofhansl):
    Hmm... Yes. So at least I got that part of my original patch right. :)

I seem to recall that I had a good reason for return null in 
BaseRegionObserver, but since I can't remember why now and there appears to be 
no good reason for for it I agree with Jesse.

                  
> BaseRegionObserver#preCompactScannerOpen returns null
> -----------------------------------------------------
>
>                 Key: HBASE-8355
>                 URL: https://issues.apache.org/jira/browse/HBASE-8355
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors
>    Affects Versions: 0.98.0, 0.94.8, 0.95.1
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>         Attachments: 8355-0.94.patch, 8355.patch
>
>
> As pointed out in https://github.com/forcedotcom/phoenix/pull/131, 
> BaseRegionObserver#preCompactScannerOpen returns null by default, which hoses 
> any coprocessors down the line, making override of this method mandatory. The 
> fix is trivial, patch coming momentarily.

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