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MapReduce, mail # user - Number of map tasks spawned


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Re: Number of map tasks spawned
Praveen Sripati 2010-04-27, 01:06
Could someone please answer this?

Thanks,
Praveen

On Sun, Apr 25, 2010 at 4:28 PM, Praveen Sripati
<[EMAIL PROTECTED]>wrote:

>
> Hi,
>
> The MapReduce tutorial specifies that
>
> >> The Hadoop Map/Reduce framework spawns one map task for each InputSplit
> generated by the InputFormat for the job.
>
> But, the mapred.map.tasks definition is
>
> >> The default number of map tasks per job. Ignored when mapred.job.tracker
> is "local".
>
> So, is the number of map tasks spawned based on the number of InputSplits
> generated or based on the mapred.map.tasks value specified in the
> configuration file?
>
> Thanks,
> Praveen
>
>
--
Praveen