目录流量控制1 固定窗口2 滑动窗口3 漏桶4 令牌桶5 滑动日志总结流量控制 一般并发系统有对应处理请求的最大能力，这里称最大qps，也需要有阈值设置，如果超过最大qps，则可能导致系统不稳定，产生雪崩效应，甚至连锁
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