连接抖动介绍
Workloads with high connection churn (a high rate of connections being opened and closed) will require TCP setting tuning to avoid exhaustion of certain resources: max number of file handles, Erlang processes on RabbitMQ nodes, kernel’s ephemeral port range (for hosts that open a lot of connections, including Federation links and Shovel connections), and others. Nodes that are exhausted of those resources won’t be able to accept new connections , which will negatively affect overall system availability.
连接抖动，就是在单位时间内，有大量的连接产生，也同时有大量的连接关闭。这些抖动将会耗费大量的资源。
从RabbitMq 3.7.9开始，引入了对抖动数据的统计。在mq管理界面上，可以看到下面的图标。
下面是随时间变化，mq连接数的抖动情况。
While connection and disconnection rates are system-specific, rates consistently above 100/second likely indicate a suboptimal connection management approach by one or more applications and usually are worth investigating.
如果抖动的指标持续的超过每秒100个，这就需要引起注意了，需要调查下具体的抖动原因。
抖动统计
抖动统计包括三个方面
- Connection
- Channel
- Queue
