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Multiple mappers, different parameter values

I have a situation wherein I have multiple mappers. I am using
MultipleInputs class to add them.

Now, I need to pass different parameters to different mappers. For e.g.
lets say I have a parameter 'num.iterations' that is set differently for
different mappers. One way to pass parameters to mappers is to set them
in a Configuration object:

Configuration conf = new Configuration();
conf.set("num.iterations", "100");

However using this I can't set the value differently for different
mappers. How do I achieve this?