著者

立川 敬行 桧垣 博章 滝沢 誠

雑誌

全国大会講演論文集

巻号頁・発行日

vol.53, pp.311-312, 1996-09-04

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Distributed systems are composed of multiple computers connected by communication networks. In distributed applications like teleconferences and teleclassrooms, a group of multiple objects have to be cooperated. The group communication protocol is required to coordinate the cooperation of the objects in the group. In the group communication, the following services have to be supported : (G1) A message sent by the member object is received by one or multiple destination members in the group. (G2) A member object in the group receives messages in the causal order. In the teleconferences, some new member joins the conference and a member leaves the conference. Furthermore, some object may be faulty. If the member-ship of the group is changed, every member object has to reach agreement on the membership. By the group membership protocol, only and all the member objects make agreement on the membership of the group. Reiter [2] discusses a centralized membership protocol where one coordinator object coordinates the cooperation among the objects and the data transmission is stopped during the execution of the membership protocol. In this paper, we would like to discuss how to support the services (G1) and (G2) without stopping the data transmission in the presence of the membership change.