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Disco: Erlang/Python Based Map-Reduce
Disco is a map-reduce framework written in Erlang and Python. Seems reasonable - I definitely prefer Python to Java for writing maps and reduces, and Erlang is rumored to be good at parallel stuff.
Interestingly no mention of an underlying distributed file system.
Via High Scalability.
There is no underlaying DFS at this moment. HTTP is used as data transport