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https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575518#comment-13575518
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James Taylor commented on HBASE-7805:
-------------------------------------
Ted is right - the start time should have been before the exec.submit() call.
With this change, I'm not seeing a significant difference between 0.94.2 and
0.94.5 - both are fine. Something else is going on - might be in the Phoenix
layer. I'll try to get to the bottom of it on Monday.
10,000,000 rows
===============
v 0.94.2 (@1395367)
-------------------
With coprocessors
Serial time: 5352, Parallel time: 3548 (66%)
Without coprocessors
Serial time: 13442, Parallel time: 7456 (55%)
v 0.94.5 (latest)
-----------------
With coprocessors
Serial time: 9921, Parallel time: 6316 (64%)
Without coprocessors
Serial time: 9711, Parallel time: 6226 (64%)
> 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, 0.94.6
>
> 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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