A nice demo of the recently announced MapReduce engine written on Python r3 library1 against commit histories from GitHub:
It is pretty simple to get r3 to do some cool calculations for us. I got the whole sample in a very short amount of time. It took me more time to write this post than to make r3 calculate the commiter percentages.
Original title and link: Demoing the Python-Based Map-Reduce R3 Against GitHub Data ( ©myNoSQL)