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https://issues.apache.org/jira/browse/MAPREDUCE-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182780#comment-13182780
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Siddharth Seth commented on MAPREDUCE-3596:
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>From another set of logs, sequence of events.
1. AM calls a startContainer
2. NM receives this, starts processing but takes about 1minutes20 seconds to
finish processing it.
3. Meanwhile, the AM times out the call after 1 minute - and sends a release
container to the RM
4. RM ends up removing references to the container
5. The NM sends a containerStarted event to the RM - which ends up causing the
NPE.
>From a quick look at the code - if the AM release event had gone out after the
>NM containerStarted, things would've been handled.
> Sort benchmark got hang after completion of 99% map phase
> ---------------------------------------------------------
>
> Key: MAPREDUCE-3596
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3596
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster, mrv2
> Affects Versions: 0.23.0
> Reporter: Ravi Prakash
> Assignee: Vinod Kumar Vavilapalli
> Priority: Blocker
> Attachments: logs.tar.bz2, logs.tar.bz2
>
>
> Courtesy [~vinaythota]
> {quote}
> Ran sort benchmark couple of times and every time the job got hang after
> completion 99% map phase. There are some map tasks failed. Also it's not
> scheduled some of the pending map tasks.
> Cluster size is 350 nodes.
> Build Details:
> ==============
> Compiled: Fri Dec 9 16:25:27 PST 2011 by someone from
> branches/branch-0.23/hadoop-common-project/hadoop-common
> ResourceManager version: revision 1212681 by someone source checksum
> on Fri Dec 9 16:52:07 PST 2011
> Hadoop version: revision 1212592 by someone Fri Dec 9 16:25:27 PST
> 2011
> {quote}
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