转载地址：https://www.cnblogs.com/sgh1023/p/11217017.html
https://www.jianshu.com/p/e128e7ce53c9 //消息确认机制
https://blog.csdn.net/u013256816/article/details/55515234//消息确认机制
https://www.jianshu.com/p/4d413dd18c14 //消息的可靠投递
https://www.cnblogs.com/shihaiming/p/11014257.html//集群
https://blog.csdn.net/wexiaoword/article/details/81352045 // 集群镜像
https://blog.csdn.net/u011665991/article/details/89946185 //消息丢失