Finalizing the checkout flow. We resolve the ultimate distributed transaction nightmare: The Sweeper cancels an expired order, but Stripe reports a successful charge due to network latency. Utilizing the Saga Pattern, Idempotency Lifecycles, and Compensating Transactions.
How to prevent overselling when thousands of admitted users compete for the same SKU. We shift from a naive atomic counter to a bounded-consistency reservation lifecycle using Redis Lua, inventory sharding, and transactional reconciliation.
Auto-scaling alone cannot save you from TCP connection exhaustion. We architect a Virtual Waiting Room using Async Polling with Jitter, Edge Bot Defense, and Cryptographic Tokens to decouple traffic flow from inventory capacity.
You don’t survive a flash sale by scaling up your database. You survive by ruthlessly shaping and dropping traffic before it reaches your core.