When I system.out.println() in a map or reduce, where does it go?

[David Coe]

I've noticed that if I put a system.out.println in the run() method I
see the result on my console.  If I put it in the map or reduce class, I
never see the result.  Where does it go?  Is there a way to get this
result easily (eg dump it in a log file)?

David