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From Harsh J <ha...@cloudera.com>
Subject Re: Mapper always hangs at the same spot
Date Sat, 13 Apr 2013 16:00:17 GMT
When you say "never progresses", do you see the MR framework kill it
automatically after 10 minutes of inactivity or does it never ever

You can lower the timeout period on tasks via mapred.task.timeout set
in msec. You could also set mapred.max.map.failures.percent to a
non-zero value to allow that much percentage of tasks to fail without
also marking the whole job as a failure.

If the task itself does not get killed by the framework due to
inactiveness, try doing a hadoop job -fail-task on its attempt ID

On Sat, Apr 13, 2013 at 8:45 PM, Chris Hokamp <chris.hokamp@gmail.com> wrote:
> Hello,
> We have a job where all mappers finish except for one, which always hangs at
> the same spot (i.e. reaches 49%, then never progresses).
> This is likely due to a bug in the wiki parser in our Pig UDF. We can afford
> to lose the data this mapper is working on if it would allow the job to
> finish. Question: is there a hadoop configuration parameter similar to
> mapred.skip.map.max.skip.records that would let us skip a map that doesn't
> progress after X amount of time? Any other possible workarounds for this
> case would also be useful.
> We are currently using hadoop 1.1.0 and Pig 0.10.1.
> Thanks,
> Chris

Harsh J

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