This article isn't exactly inspring me to give MongoDB a shot. I wasn't even aware Map-Reduce in MongoDB was single-threaded, doesn't that defeat the entire pu

This article isn't exactly inspring me to give MongoDB a shot. I wasn't even aware Map-Reduce in MongoDB was single-threaded, doesn't that defeat the entire purpose? Isn't Map-Reduce an embarrassingly parallel algorithm? If they're using a single-thread JS engine, can't they just multiprocess? No shared state, after all...