Policies for using replica groups and their effectiveness over the Internet
COMM '00 Proceedings of NGC 2000 on Networked group communication
Implementing a replicated service with group communication
Journal of Systems Architecture: the EUROMICRO Journal
Disaster avoidance mechanism for content-delivering service
Computers and Operations Research
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Distributed applications should be able to make use of an object group service in a number of application specific ways. Three main modes of interactions can be identified: (i) request-reply: a client issues a request to multiple servers and waits for their replies; this represents a commonly occurring scenario when a service is replicated; (ii) group-to-group request-reply: a generalization of the previous case, where clients are themselves groups; and (iii) Peer Participation: here all the members are regularly multicasting messages (asynchronous invocation); this represents a commonly occurring scenario when the purpose of an application is to share information between members, (e.g., a teleconferencing application). Customization within each class of interaction is frequently required for obtaining better performance. This paper describes the design and implementation of a flexible CORBA object group service that supports the three types of interactions and enables application specific customization. Performance figures collected over low latency LAN and high latency WAN are presented to support the case for flexibility.