摘要
1引言
为提高分布式系统的可用性,研究者大都在系统中引入冗余,组通信技术是应用最广的一种空间冗余技术.其基本思想是在某一处理机组中备份客户请求,当某处理机出现错误时,副本组向客户提供错误屏蔽.
Both active replication and passive replication in group communication system are limited to implementing the false-tolerance distributed system. In this paper, we have presented a duplicate technique called Semi-Active replication SAR, which takes in the advantage of two former techniques. As taking events log as synchronous object, employing reliable multicast as synchronous way between copies, and using the substitution method in passive replication, this new method implements the fault control to the processors in group communication system on the premise of assuring the consistence between duplicates and deceasing overhead of the system. It is best answer for large distributed system. Finally we apply the method in the distributed applications based on EJB specifications. It is shown that SAG provides a good solution for the false-tolerance distributed system where the communication model between clients and servers is point-to-point.
出处
《计算机科学》
CSCD
北大核心
2003年第10期131-132,183,共3页
Computer Science
基金
国家教育部重点科技课题(2000156)
海外杰出青年科学基金(69928201)
