K. Taguchi and M. Takizawa (Japan)
Distributed Systems, Group Communications, LargeScale Group, Causality
In this paper, we discuss a hierarchical group which is composed of subgroups of processes. Each subgroup has a gateway process which communicates with the other gateway processes. We propose a mechanism to causally deliver messages to processes in a group by using a vec tor of message sequence numbers whose size is the num ber of subgroups, not number of processes. We assume networks are less-reliable, i.e. messages may be lost.
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