Comments (4)
你可以这么理解,rabbitmq服务器就是作为你说的那个IP组播里面的组,你pulisher将一个tcp包发到rabbitmq,然后rabbitmq服务器同时将10个消息同时发送到10个消息队列里,而这10个消息队列里对应你每一个subscriber ,然后你每个subscriber 就同时接收到了tcp包,虽然tcp包还是有10个,但是是同时给你的每个subscriber ,跟你说的每一个subscriber 等待前面subscriber 接收完毕是不一样的。
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我了解下组播的介绍,可以通过topic类型的exchange然后广播给多个消息队列啊,每个消息队列中有唯一一个消费者,这个消费者就是对应的物理机器,这样就实现了吧?
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是这样的, Rabbitmq的组播还是基于TCP的, 你说的exchange 那种 是应用层的组播 并不是网络层的组播。
简单的说的话, 10 个subscriber 请求同一个消息, pulisher在网络层还是发送一个个的TCP 包到 10个人。 而不向IP 组播, 只发一个包到到一个组, 全组人都能收到(10个人)
要是100个人的话, 第100个人 收到包时, RabbitMQ必须先发99个tcp包, 对第一百个人来说会很慢
IP 组播的话不管10个人还是100个人都是一个包搞定
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我是这么做的。你描述的是应用层rabbitmq怎么运行的, 但是底下的网络层,比如从网卡发出的包,
还是100个tcp包对应100个subscriber。
结果就是 随着用户的增加, rabbitmq的性能跟不上, 因为从rabbitmq发出来的 还是一个一个tcp的包,100个用户一百个tcp包。(如果换成UDP下的IP组播, 就是一百个用户一个包)
当然我是为了搞科研(量做的很大),当用户数量增大, 比如一屋子的IOT设备
我的问题是: rabbitmq 可以基于UDP吗,比如PGM 协议?
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