Calculating In-Degree using R MapReduce over Hadoop
Marko Rodriguez, the source of so many neat graph resources demonstrates:
How to use an R package for MapReduce over Hadoop to calculate vertex in-degree and concludes with a question: “Can you tell me how to calculate a graph’s degree distribution? — HINT: its this MapReduce job composed with another.”
Never one to allow a question to sit for very long, ;-), Marko supplies the answer and plots the results using R. (By the posting times, which may be horribly incorrect, Marko waited less than an hour before posting the answer. Moral here is that if Marko asks a question, answer early and often.)