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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7805) Scan of same region processed serially if table has region observer coprocessor
Date Sun, 10 Feb 2013 20:33:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575518#comment-13575518
] 

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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