The consensus problem in fault-tolerant computing
ACM Computing Surveys (CSUR)
Distributed operating systems
Unreliable failure detectors for reliable distributed systems
Journal of the ACM (JACM)
The Transis approach to high availability cluster communication
Communications of the ACM
Distributed systems (3rd ed.): concepts and design
Distributed systems (3rd ed.): concepts and design
Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Distributed computing: fundamentals, simulations and advanced topics
Distributed computing: fundamentals, simulations and advanced topics
A Client-Server Approach to Virtually Synchronous Group Multicast: Specifications and Algorithms
ICDCS '00 Proceedings of the The 20th International Conference on Distributed Computing Systems ( ICDCS 2000)
An Integrated Solution for Secure Group Communication in Wide-Area Networks
ISCC '01 Proceedings of the Sixth IEEE Symposium on Computers and Communications
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In dynamic object groups, objects are allowed to join or leave the group at any time during the group lifetime. Each time the number of members in a group changes, a new view is created. Virtual synchrony is an useful property in dynamic groups which guarantees that if two processes stay in the same view after a view change, the same set of messages will be delivered to them. Most of the protocols that implement virtual synchrony stop regular message activity while a view change is under way. Optimistic virtual synchrony (OVS) allows messages to be sent and received while a view is changing by estimating which members would be present in the next view. If the estimation is wrong, messages are "rolled back". In this paper, we propose and evaluate an approach to integrate OVS to a CORBA group service called OGS. Our results show that OVS provides very good performance improvements during view changes when compared with other protocols that guarantee virtual synchrony.