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From "George Datskos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2374) "Text File Busy" errors launching MR tasks
Date Fri, 12 Oct 2012 00:07:04 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13474654#comment-13474654

George Datskos commented on MAPREDUCE-2374:

Arun just closed this issue, but it hasn't been applied to branches 1 (or 1.1) yet. Can you
consider this for inclusion in 1.0.4 as well?
> "Text File Busy" errors launching MR tasks
> ------------------------------------------
>                 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: Andy Isaacson
>             Fix For: 0.23.3, 2.0.2-alpha
>         Attachments: failed_taskjvmsh.strace, mapreduce-2374-2.txt, mapreduce-2374-branch-1.patch,
mapreduce-2374-on-20sec.txt, mapreduce-2374.txt, mapreduce-2374.txt, mapreduce-2374.txt, successfull_taskjvmsh.strace
> Some very small percentage of tasks fail with a "Text file busy" error.
> The following was the original diagnosis:
> {quote}
> 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.
> {quote}
> .. but turned out to be another issue as well (see below)

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