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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-7805) Scan of same region processed serially if table has region observer coprocessor
Date Sun, 10 Feb 2013 18:47:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575489#comment-13575489
] 

Andrew Purtell edited comment on HBASE-7805 at 2/10/13 6:47 PM:
----------------------------------------------------------------

{code}
    // Somewhat arbitrary, but parallel time must be at least 25% less than serial time
    assertTrue(parallelTime * 5 / 4 < serialTime);
{code}

Try replacing this assertion with something that doesn't rely on wall clock time?
                
      was (Author: apurtell):
    {code}
    // Somewhat arbitrary, but parallel time must be at least 25% less than serial time
    assertTrue(parallelTime * 5 / 4 < serialTime);
{code}

Try replacing the calls to currentTimeMillis() with something that doesn't rely on wall clock
time?
                  
> 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, 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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