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https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575465#comment-13575465
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James Taylor commented on HBASE-7805:
-------------------------------------

I had compiled against 94.2 - sorry about that. I can't get it to fail either 
on the latest 0.94, though the test does ensure that the rows are in the block 
cache, maybe HBASE-7336 fixed more than Lars thought. Good news. Will do some 
more testing on Monday and upgrade Phoenix to run on 0.94.4.

Would be good if HBase had a base impl class that implementors of coprocessors 
could derive from to shield (at least partially) interface changes like the one 
to RegionScanner between 0.94.2 and 0.94.4.
                
> Scan of same region processed serially if table has region observer 
> coprocessor
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-7805
>                 URL: https://issues.apache.org/jira/browse/HBASE-7805
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors, Scanners
>    Affects Versions: 0.94.4
>            Reporter: James Taylor
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: 7805-trunk.txt, ParallelScanTestCoProc.java, 
> ParallelScanTest.java
>
>
> If multiple scans to different parts of the same region are executed in 
> parallel, they are processed serially if the table has a region observer 
> coprocessor.

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