STEM与日常科技·英语30篇（3）
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Circuit Breakers and Graceful Degradation in Microservices
微服务中的熔断机制与优雅降级
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When a microservice fails repeatedly, a circuit breaker stops further calls to prevent cascading failures.
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This pattern acts like a physical fuse that 'trips' after detecting too many timeouts or errors.
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Once tripped, the breaker redirects requests to fallback logic instead of the broken service.
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For example, an e-commerce app may show cached product prices when the pricing service is down.
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Degradation is graceful because users still get partial functionality, not blank screens or errors.
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After a timeout, the breaker enters a 'half-open' state to test if the service has recovered.
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Engineers configure thresholds for failure rate, response time, and retry intervals carefully.
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Unlike simple retries, this design prioritizes system stability over immediate correctness.
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Real-world systems like Netflix's Hystrix popularized this resilience pattern in cloud environments.
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Understanding it helps explain why some features disappear temporarily during outages.