On Wed, Jan 21, 2009 at 11:12 PM, Eugene Kirpichov <ekirpic...@gmail.com> wrote: > To my mind, in the map-reduce case you generally need a commutative > monoid. Or, you need an extra infrastructure that mappend's only > results from adjacent machines, or something like that.
This is a good paper on the stuff I'm talking about: http://citeseer.ist.psu.edu/blelloch90prefix.html It doesn't explicitly mention monoids but it's all about associative operations with identity. -- Dan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
