Pseudo-active Replication in Wide-area Network (特集マルチメディア通信プロトコル)

概要

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In order to realize mission-critical applications in distributed systems, the systems are required to be fault-tolerant. In this paper, we discuss how to replicate a server in order to obtain fault-tolerant services. In the active replication, all the requests from a client are performed by all the server replicas in the same order. The replicas are rather placed on heterogeneous computers and the distributed applications are now being realized in wide-area networks, e.g., the Internet, where each communication channel had different message transmission delay and bandwidth. Hence, the response times of the replicas observed by the clients are not the same. We newly propose a pseudo-active replication where the client does not wait for any response after receiving one response and slower replicas do not perform every request performed by the faster replicas.
一般社団法人情報処理学会の論文
2000-02-15