Multi-outlet ordering system design 1 question in 2 chapters

  1. 01Orders, outlet ownership and inventory
  2. 02Sources

Orders, outlet ownership and inventory

  • 1.1 How would you design ordering across multiple restaurant outlets? Hard 7 min

    I choose an outlet before accepting an order, because price, availability and kitchen capacity belong to that outlet. I reserve its stock with a guarded database update, not a read followed by a write. Order creation and reservation commit together when they share a database. Payment runs outside that transaction, with retries and compensation. I scale stateless request handling separately from kitchens and watch hot outlets before adding more application instances.

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Sources

Source: PostgreSQL 18: Transaction isolation Source: PostgreSQL 18: Explicit locking Source: Transactional outbox Source: Kubernetes: HPA