tatkal: Ek Seat, Lakhon Log

About this pdf

A free 20-page guide that answers the reel's real question first: when the payment gets stuck, the seat is held on a timer while the money waits for the bank's final answer, and you get either the ticket or an automatic refund (sometimes both). It then walks through the whole design of a Tatkal-style booking system: four ways to stop double booking, seat holds and idempotency keys, the payment state machine, reconciliation and the RBI's refund deadlines, waiting rooms, caches, bots and load. It ends with interview questions, a design-it-yourself exercise and 43 linked sources.

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