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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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