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Date: Sun, 30 Oct 2011 13:18:33 +0000 (UTC)
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Subject: [jira] [Commented] (MAPREDUCE-3274) Race condition in MR App Master
 Preemtion can cause a dead lock
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139621#comment-13139621 ] 

Hudson commented on MAPREDUCE-3274:
-----------------------------------

Integrated in Hadoop-Mapreduce-0.23-Build #75 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/75/])
    MAPREDUCE-3274. Fixed a race condition in MRAppMaster that was causing a task-scheduling deadlock. Contributed by Robert Joseph Evans.
svn merge -c r1195145 --ignore-ancestry ../../trunk/

vinodkv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1195146
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/TaskAttemptListenerImpl.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/TaskAttemptListener.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapred
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapred/TestTaskAttemptListenerImpl.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java

                
> 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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