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https://issues.apache.org/jira/browse/MAPREDUCE-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421605#comment-13421605
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Andy Isaacson commented on MAPREDUCE-2374:
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Colin, I think you've got a great theory! That fork-from-another-thread
scenario would explain the intermittent problems.
bq. It may be helpful to use strace -f to follow forks. I realize there's a lot
of output, but those are the lines we need, I think.
My favorite strace commandline is {{strace -tttfo /tmp/foo -p <pid>}}, with
-ttt for millisecond timestamps and -f to follow forks and -o to put the output
in a file.
> Should not use PrintWriter to write taskjvm.sh
> ----------------------------------------------
>
> Key: MAPREDUCE-2374
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2374
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.22.1
>
> Attachments: failed_taskjvmsh.strace, mapreduce-2374-on-20sec.txt,
> mapreduce-2374.txt, mapreduce-2374.txt, successfull_taskjvmsh.strace
>
>
> Our use of PrintWriter in TaskController.writeCommand is unsafe, since that
> class swallows all IO exceptions. We're not currently checking for errors,
> which I'm seeing result in occasional task failures with the message "Text
> file busy" - assumedly because the close() call is failing silently for some
> reason.
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