STEM与日常科技·英语30篇（3）

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微服务中的熔断机制与优雅降级

When a microservice fails repeatedly, a circuit breaker stops further calls to prevent cascading failures.
This pattern acts like a physical fuse that 'trips' after detecting too many timeouts or errors.
Once tripped, the breaker redirects requests to fallback logic instead of the broken service.
For example, an e-commerce app may show cached product prices when the pricing service is down.
Degradation is graceful because users still get partial functionality, not blank screens or errors.
After a timeout, the breaker enters a 'half-open' state to test if the service has recovered.
Engineers configure thresholds for failure rate, response time, and retry intervals carefully.
Unlike simple retries, this design prioritizes system stability over immediate correctness.
Real-world systems like Netflix's Hystrix popularized this resilience pattern in cloud environments.
Understanding it helps explain why some features disappear temporarily during outages.