摘要： 在分析了单个复本加入组行为的基础上，提出了组加入的概念和具体算法，并对其进行了理论分析和证明。结论表明，组加入的方式可以有效地减少网络的消息报文数量，并缩短加入过程的平均延迟。

关键词: 组加入；成员管理；容错；一致性问题

Abstract: This paper proposes the concept of group join action based on member join action in a group. It also proposes an algorithm solution and proves its correctness theoretically. Result shows that the group join algorithm can efficiently reduce message numbers and shorten the average delay of join procedure.

Key words: Group join; Group membership; Fault tolerance; Agreement problem