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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5044) Have AM trigger jstack on task attempts that timeout before killing them
Date Tue, 17 Dec 2013 21:48:08 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850959#comment-13850959
] 

Sandy Ryza commented on MAPREDUCE-5044:
---------------------------------------

This should depend on YARN-445, right?

> 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, 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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