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Date: Sun, 30 Oct 2011 00:57:32 +0000 (UTC)
From: "Robert Joseph Evans (Updated) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Updated] (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:all-tabpanel ]

Robert Joseph Evans updated MAPREDUCE-3274:
-------------------------------------------

    Attachment: MR-3274.txt

Addressed the comments.
                
> 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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