Design a ticket reservation system capable of handling 500,000 concurrent fans attempting to purchase 50,000 concert tickets simultaneously without double-booking or system crashes.
Displays interactive seat map with 10-minute countdown checkout timer.
Buffers traffic and issues tokenized queue positions during high demand drops.
Executes atomic seat reservation using distributed locks and manages order workflows.
Atomic SET seat:{id} token NX PX 600000 locks for 10-minute temporary seat holds.
Asynchronously processes Stripe/PayPal payment callbacks and releases timed-out holds.
Enforces strict ACID transactions with row-level locks for final ticket ownership.
User gets queue token #4,120 and waits for turn.
Throttles incoming user flow to match database capacity.
Acquire 10-minute atomic lock on seat A_101 in Redis.
If lock fails (seat already taken), return 409 Conflict immediately.
User has 10 minutes to finish payment on Stripe.
Payment success! Commit SQL transaction and issue QR ticket.