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https://issues.apache.org/jira/browse/MAPREDUCE-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15145291#comment-15145291
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Gera Shegalov commented on MAPREDUCE-5044:
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Hi [~eepayne], I am glad that we are finally picking it up. These thread dumps
along with xprof has made debugging at Twitter so easy. Often you see what's
wrong even without looking at the user code. Unfortunately, organizationally,
Hadoop is not my current focus (it's been 2+ years since I posted my patch) .
I am sure somebody from @TwitterHadoop will help move it along.
> Have AM trigger jstack on task attempts that timeout before killing them
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-5044
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5044
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mr-am
> Affects Versions: 2.1.0-beta
> Reporter: Jason Lowe
> Assignee: Gera Shegalov
> Attachments: MAPREDUCE-5044.v01.patch, MAPREDUCE-5044.v02.patch,
> MAPREDUCE-5044.v03.patch, MAPREDUCE-5044.v04.patch, MAPREDUCE-5044.v05.patch,
> MAPREDUCE-5044.v06.patch, Screen Shot 2013-11-12 at 1.05.32 PM.png, Screen
> Shot 2013-11-12 at 1.06.04 PM.png
>
>
> When an AM expires a task attempt it would be nice if it triggered a jstack
> output via SIGQUIT before killing the task attempt. This would be invaluable
> for helping users debug their hung tasks, especially if they do not have
> shell access to the nodes.
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