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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3274) Race condition in MR App Master Preemtion can cause a dead lock
Date Sun, 30 Oct 2011 01:27:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139512#comment-13139512
] 

Hadoop QA commented on MAPREDUCE-3274:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12501485/MR-3274.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +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 (version 1.3.9) warnings.

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

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

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1205//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1205//console

This message is automatically generated.
                
> Race condition in MR App Master Preemtion can cause a dead lock
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-3274
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3274
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mrv2
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>             Fix For: 0.23.0, 0.24.0
>
>         Attachments: MR-3274.txt, MR-3274.txt
>
>
> There appears to be a race condition in the MR App Master in relation to preempting reducers
to let a mapper run.  In the particular case that I have been debugging a reducer was selected
for preemption that did not have a container assigned to it yet. When the container became
available that reduce started running and the previous TA_KILL event appears to have been
ignored.

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