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Re:The Uber Engineering Tech Stack, Part I: The Foundation by dang on Sunday July 24, 2016 @03:28PM (#12154448)
This is helpful information if accurate, but please edit incivility like "It sounds like you have no idea" out of your comments here. The site guidelines ask you to omit this sort of thing, so please post civil and substantive comments only:

https://news.ycombinator.com/newsguidelines.html

https://news.ycombinator.com/newswelcome.html

Re:The Uber Engineering Tech Stack, Part I: The Foundation by gaius on Monday July 25, 2016 @11:25AM (#12159296)
He or she is correct that the cash settlements were and are batched, but authorizations, reservations etc were online - to the mainframe that's just another transaction.

The reason settlements were batched was to save on wire fees.