Preventing Cascading System Failures
When external payment gateways, SMS providers, or telco APIs experience latency or outages, synchronous calls will block web worker threads, rapidly exhausting connection pools. The Circuit Breaker pattern detects failure thresholds and immediately fails fast, protecting core application availability.
Three States of Resiliency
- Closed: Normal operation; requests pass through.
- Open: Failure threshold exceeded; requests fail immediately with fallback responses.
- Half-Open: Trial requests sent periodically to check downstream service recovery.
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