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docs(circuit_breaker): add ema wiki link #1575

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Oct 11, 2021
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docs(circuit_breaker): add ema wiki link #1575

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2 changes: 1 addition & 1 deletion docs/cn/circuit_breaker.md
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Expand Up @@ -22,7 +22,7 @@ option.enable_circuit_breaker = true;
可选的熔断由CircuitBreaker实现，在开启了熔断之后，CircuitBreaker会记录每一个请求的处理结果，并维护一个累计出错时长，记为acc_error_cost，当acc_error_cost > max_error_cost时，熔断该节点。

**每次请求返回成功之后，更新max_error_cost:**
1. 首先需要更新latency的EMA值，记为ema_latency: ema_latency = ema_latency * alpha + (1 - alpha) * latency。
1. 首先需要更新latency的[EMA](https://en.wikipedia.org/wiki/Moving_average)值，记为ema_latency: ema_latency = ema_latency * alpha + (1 - alpha) * latency。
2. 之后根据ema_latency更新max_error_cost: max_error_cost = window_size * max_error_rate * ema_latency。


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