System design interview question
"Design a ticketing platform for live events. A stadium tour goes on sale at 10am; two million people want fifty thousand tickets, and a large fraction of them are bots working for resellers. Design the on-sale."
the most extreme contention scenario in this list, plus an adversarial dimension that cinema booking does not have — professional resellers with significant budgets attacking your system. The distinguishing content is: queueing as the primary mechanism rather than a fallback, the economics that make bots worth fighting, and the fact that the cheapest technical answer (a lottery) is often the right one.
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