全局有序的可靠多播协议  

Totally ordered reliable multicast

作　　者：裴云彰[1] 刘艳[1] TAN Kun 谭焜[1] 史元春[1] 徐光祐[1] 

机构地区：清华大学 计算机科学与技术系,[1] Department of Computer Science and Technology,Tsinghua University,[2],北京100084

出　　处：《清华大学学报（自然科学版）》2001年第1期53-56,共4页Journal of Tsinghua University(Science and Technology)

基　　金：清华大学"九八五"学科建设重点项目!(985校 -2 2 -攻关0 6);国防预研基金项目!(98J15 .4.4.JW0 10 7)

摘　　要：描述了 TORM(totally ordered reliable m ulticast)这一用于白板等实时交互式应用的可靠多播协议。它除了利用多播为上层应用提供高效可靠的数据传输服务外 ,还实现了集中式的并发控制机制 ,保证会话中的消息以全局唯一的顺序提交给应用层 ,便于白板应用维护数据一致性。 TORM采用层次结构 ,解决了确认内爆问题 ,提高了协议的可伸缩性。 TORM还通过多播服务和客户的分离提高了可靠性和灵活性 。This paper describes a reliable multicast protocol, totally ordered reliable multicast (TORM), designed for real time interactive applications, e.g., whiteboard. In addition to providing reliable data dissemination services for the application, TORM integrates a centralized currency control mechanism to ensure that messages are delivered to the application layer in a globally unique order. With this mechanism, the whiteboard application is able to maintain a consistent state among all the sites. To solve the acknowledgement implosion problem and to improve scalability, the TORM design employs a hierarchical structure in which the reliable multicast service runs as independent entities on the network. A flexible message caching strategy is also incorporated in TORM to reduce memory usage.

关 键 词：可靠多播协议 全局有序 并发控制 IP多播 

分 类 号：TN915.04[电子电信—通信与信息系统]