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https://issues.apache.org/jira/browse/HBASE-8355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633403#comment-13633403
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Andrew Purtell commented on HBASE-8355:
---------------------------------------

bq. I wasn't sure what the protocol on changing the expected behavior for CPs 
was for 0.94... guess its ok?

In my view we should not expect this behavior out of 
BaseRegionObserver#preCompactScannerOpen. :-)
                
> 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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