Title: I have been wondering consistency guarantees at scale, specially with a massive number of concurrent users.<p>It seems that Booking.com mainly uses MySQL for most product features and use-cases and I am wondering how do they ensure that a listing is not booked by multiple users? Is the reservation system a single service with it&#x27;s own storage and they run serializable transactions on it? Or do they utilize other means of distributed transactions, such as: distributed locking, 2PC, 3PC or Sagas?
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