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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1119) When tasks fail to report status, show tasks's stack dump before killing
Date Fri, 16 Oct 2009 23:57:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766778#action_12766778
] 

Hong Tang commented on MAPREDUCE-1119:
--------------------------------------

+1. Understanding why tasks fail would be very valuable to help both framework devs and users.

> When tasks fail to report status, show tasks's stack dump before killing
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1119
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1119
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>
> When the TT kills tasks that haven't reported status, it should somehow gather a stack
dump for the task. This could be done either by sending a SIGQUIT (so the dump ends up in
stdout) or perhaps something like JDI to gather the stack directly from Java. This may be
somewhat tricky since the child may be running as another user (so the SIGQUIT would have
to go through LinuxTaskController). This feature would make debugging these kinds of failures
much easier, especially if we could somehow get it into the TaskDiagnostic message

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