To CATOCS or not to CATOCS, that is the …
ACM SIGOPS Operating Systems Review
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The concept of Causal Blocks is developed as a way of representing event ordering information is a concise manner. A multicast protocol is then developed using Causal Blocks to provide total order message delivery in an asynchronous communication environment where interprocess communication delays can be potentially unbounded. The protocol offers a simple method for dealing with overlapping process groups and has low message space overhead (the protocol related information contained in a multicast message is small).