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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1119) When tasks fail to report status, show tasks's stack dump before killing
Date Tue, 10 Nov 2009 18:59:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776008#action_12776008
] 

Doug Cutting commented on MAPREDUCE-1119:
-----------------------------------------

> Is all this worth it just to avoid stack dumps in aborted speculative task attempts?

Probably so, although I've not looked at the details.  A task timing out is a bad thing. 
A speculative task getting killed is normal.  One should be able to easily scan a job's log
for bad things.

These are all internal APIs, right?  If so, it shouldn't create problems to change them, should
it?


> 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
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-1119.2.patch, MAPREDUCE-1119.patch
>
>
> 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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