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https://issues.apache.org/jira/browse/MAPREDUCE-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791969#action_12791969
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Brian Karlak commented on MAPREDUCE-1308:
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I can find no indication of error in the syslog files.
/var/log/messages has only syslog-ng and ntpd messages in the time 03:50 --
05:40.
> reduce tasks stall and are eventually killed
> --------------------------------------------
>
> Key: MAPREDUCE-1308
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1308
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Environment: 20-node cluster, 8 cores per machine, 32GB memory,
> Fedora Linux
> Reporter: Brian Karlak
>
> We recently migrated our 0.19.2 cluster from Gentoo Linux to Fedora Linux.
> Everything was running smoothly before, but now about 5%-10% of our jobs have
> at least one reduce task that stalls out and is eventually killed with the
> message:
> Task attempt_200912102211_1648_r_000009_0 failed to report status for
> 6003 seconds. Killing!
> The task is then re-launched and completes successfully, usually in a couple
> of minutes.
> This is problematic because our scheduled Hadoop jobs now take an extra
> hour-and-a-half to run (6000 seconds).
> There are no indications in the logs that anything is amiss. The task
> starts, a small amount of the copy/shuffle runs, and then nothing is else is
> heard from the task until it is killed. I will attach the relevant parts of
> the TaskTracker logs in the comments.
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