System Architecture & Resilience Strategy
When a single downstream service experiences latency or crashes under load, unhandled synchronous HTTP retries can trigger a cascading failure that brings down the entire application platform.
3 Key Resilience Patterns
- ▸Circuit Breaker State Machine: Transitioning endpoints between Closed, Open, and Half-Open states based on failure rate thresholds (e.g., 50% error rate over 10s).
- ▸Asynchronous Task Offloading: Moving heavy write operations to RabbitMQ queues backed by Celery background workers.
- ▸Dead Letter Queues (DLQ): Capturing poison-pill messages after 3 failed retries for isolated inspection without blocking queue processing.