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.
When does the LMAX Disruptor fail? We explore the CAP theorem, quantify the brutal costs of Kernel Bypass, and provide a strict decision framework for system design.
How to survive hardware crashes without a database. We explore Event Sourcing, the Sequencer pattern, and UDP Multicast to achieve 99.999% uptime in a single-threaded architecture.
Why multi-threading kills High-Frequency Trading systems. We explore lock-free concurrency, Mechanical Sympathy, and the LMAX Disruptor pattern to achieve sub-microsecond matching.