High-Concurrency

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.