System Design Patterns: From Fundamentals to Real Systems
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Graceful Degradation

1. The Incident

Your homepage depends on 12 service calls, including catalog, cart badge, recommendations, reviews, pricing, promotions, and recently viewed. Every call has a timeout, controlled retries, and a circuit breaker.

When recommendations becomes unavailable, its breaker opens within one second and rejects calls immediately, yet the homepage still returns an error page.

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