令牌桶算法和漏桶算法以及流量控制浅谈 - iamzhongyong - ITeye技术网站



令牌桶算法和漏桶算法以及流量控制浅谈 - iamzhongyong - ITeye技术网站

在双十一等大促环节,系统需要限流,外部需要在我制定的速率限制来调用(超出的流量直接挡掉,系统不进行处理),有没有理论依据呢?这里看了两个算法

约定访问速率是流量管理中比较常用的方法之一,令牌桶算法,是目前最常用的流量限制的方法。

      

        什么是令牌桶算法?

        令牌桶算法是网络流量整形(Traffic Shaping)和速率限制(Rate Limiting)中最常使用的一种算法。典型情况下,令牌桶算法用来控制发送到网络上的数据的数目,并允许突发数据的发送。

        令牌桶:网络设备中的内部存储池

        令牌:给定速率填充令牌桶的虚拟信息包

        通俗的理解,令牌桶是一个水桶,而令牌是通过一根水管流到水桶中的水

        令牌桶的填满时间,是由桶的自身容量、令牌漏出速率(桶下面的水管)、超过平均速率的突发流量持续的时间三个方面共同决定的。如果突发流量的时间比较短,令牌桶不会溢出,在通信流上不会受到影响,如果突发流量比较大,时间比较长,那令牌桶就会溢出,多余的通信流就会被限制。


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