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From Harsh J <qwertyman...@gmail.com>
Subject Re: is this warning messages considerable to fix ?
Date Wed, 02 Mar 2011 06:26:50 GMT
This is just an effect of Speculative Execution being turned on. There
should generally be no problems if you're sticking to typical MR

If you fear that two mappers/reducers doing the same operation may
affect your goal, disable it in the job (may also be a sign that you
can improve things). Running a job to hand-insert records into an
external table may be one place where you need to consider turning off
speculative executions.

On Wed, Mar 2, 2011 at 11:42 AM, Jun Young Kim <juneng603@gmail.com> wrote:
> hi,
> under an single hadoop job execution, I got several these errors from
> mapper.
> Another (possibly speculative) attempt already SUCCEEDED
> is this able to cause errors ?--
> Junyoung Kim (juneng603@gmail.com)

Harsh J

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