Google really tries to put your application in the AppEngine box, though of course you do it yourself and go with GCE. When will we get a PaaS that lets you run these big-memory apps? Or maybe you just need to be on AWS?
I wondered how routing engines do it. (Air ticketing, Waze, etc.) They send the traveling salesman (right, there are more efficient algos!) through their entire network of routes, and that's while you wait. But I still don't totall understand how the authors of this article did it.
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