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