num of reducer

[Thamizhannal Paramasivam]

Hi All,
I am using hadoop-0.19.2 and running a Mapper only Job on cluster. It's
input path has >1000 files of 100-200MB. Since, it is Mapper only job, I
gave number Of reducer=0. So, it is using 2 mapper to run all the input
files. If we did not state the number of mapper, would n't it pick the 1
mapper per input file? Or Does the default won't it pick a fair num of
mapper according to number input file?
Thanks,
tamil