Pseudo-active Replication in Wide-area Network

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In order to realize mission-critical applications in distributedsystems the systems are required to be fault-tolerant.In this paper we discuss how to replicate a server in order to obtainfault-tolerant services.In the active replication all the requests from a client areperformed by all the server replicas in the same order.The replicas are rather placed on heterogeneous computers and thedistributed applications are now being realized in wide-area networks e.g. the Internet where each communication channel has differentmessage transmission delay and bandwidth.Hence the response times of the replicas observed by the clients arenot the same.We newly propose a pseudo-active replication where the client does notwait for any response after receiving one response and slowerreplicas do not perform every request performed by the faster replicas.

In order to realize mission-critical applications in distributedsystems, the systems are required to be fault-tolerant.In this paper, we discuss how to replicate a server in order to obtainfault-tolerant services.In the active replication, all the requests from a client areperformed by all the server replicas in the same order.The replicas are rather placed on heterogeneous computers and thedistributed applications are now being realized in wide-area networks,e.g., the Internet, where each communication channel has differentmessage transmission delay and bandwidth.Hence, the response times of the replicas observed by the clients arenot the same.We newly propose a pseudo-active replication where the client does notwait for any response after receiving one response and slowerreplicas do not perform every request performed by the faster replicas.

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