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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1119) When tasks fail to report status, show tasks's stack dump before killing
Date Wed, 02 Dec 2009 08:42:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784707#action_12784707
] 

Vinod K V commented on MAPREDUCE-1119:
--------------------------------------

bq. I am not very sure we want to use the same configuration property for sleeping after dump-stack
bq. So I think the delay is necessary. As for adding a new config item.. maybe wait til someone
makes an issue of this? Is there any performance implication here?
Given that the delay is necessary, it is only about the config item - new or the same one.
Thinking a bit about it, i am fine with keeping the same configuration because that kind of
gives the same time for thread-dump as the time that is given for the process to clean itself
up. I know it isn't a very concrete reason but it works for me for now :)

Gone through your latest patch. It looks good now. +1 from my side.

I'll run it through Hudson once again to be sure about the test-cases. May be  {{TestGridmixSubmission}}
and {{TestJobHistory.testDoneFolderOnHDFS()}} failures are timing related.

After Hudson blesses, can you ask someone to commit this? Thanks for being patient throughout!

> 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-1119.3.patch, MAPREDUCE-1119.4.patch,
MAPREDUCE-1119.5.patch, MAPREDUCE-1119.6.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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