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https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575618#comment-13575618
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Lars Hofhansl commented on HBASE-7805:
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If the data is in cache and we have a multi core machine I would expect that
scanning 1/2 the rows with two scanners yield a close to 2x improvement. So
there's still some internal friction to be removed.
James, let's run this through the profiler tomorrow to see whether we can
pinpoint that friction.
> 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
> Priority: Minor
> Attachments: 7805-0.94.patch, 7805-trunk.txt, 7805-trunk-v2.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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