Number of map tasks spawned

[Praveen Sripati]

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