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https://issues.apache.org/jira/browse/MAPREDUCE-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136369#comment-13136369
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Robert Joseph Evans commented on MAPREDUCE-3274:
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No that doesn't make any since. Because the reduce cannot be added in until it
has a container. I will need to look at this further.
> 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: mrv2, scheduler
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Critical
> Fix For: 0.23.0, 0.24.0
>
>
> 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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