Design Studio — Design Ticketmaster / BookMyShow
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Requirements
Scale & non-functional
- Strong consistency for seat inventory (correctness over availability)
- Very read-heavy browsing (100:1+) but write-critical booking
- Survive flash-sale spikes — 100k+ users hitting one event at t=0
- Reservation timeout ~10 minutes, then the seat returns to the pool
- Payments must be idempotent — never double-charge on a retry
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