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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1308) reduce tasks stall and are eventually killed
Date Thu, 17 Dec 2009 08:12:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791842#action_12791842
] 

Arun C Murthy commented on MAPREDUCE-1308:
------------------------------------------

bq. This is problematic because our scheduled Hadoop jobs now take an extra hour-and-a-half
to run (6000 seconds).

First up, this is a per-job config... why is mapred.task.timeout set to 6000s? The default
value is 600s.

----

Could you please check the reducer's syslog file to check if there are issues?

> 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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