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Date: Mon, 15 Feb 2010 07:09:28 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1436) Deadlock in preemption code in
 fair scheduler
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833700#action_12833700 ] 

Hadoop QA commented on MAPREDUCE-1436:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12435844/mapreduce-1436-v2.patch
  against trunk revision 909993.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/453/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/453/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/453/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/453/console

This message is automatically generated.

> Deadlock in preemption code in fair scheduler
> ---------------------------------------------
>
>                 Key: MAPREDUCE-1436
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1436
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/fair-share
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Matei Zaharia
>            Assignee: Matei Zaharia
>            Priority: Blocker
>         Attachments: deadlock.png, mapreduce-1436-v2.patch, mapreduce-1436.patch
>
>
> In testing the fair scheduler with preemption, I found a deadlock between updatePreemptionVariables and some code in the JobTracker. This was found while testing a backport of the fair scheduler to Hadoop 0.20, but it looks like it could also happen in trunk and 0.21. Details are in a comment below.

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