A redundancy protocol for service-oriented architectures

Achieving high-availability in service-oriented systems is a challenge due to the distributed nature of the architecture. Redundancy, using replicated services, is a common software strategy for improving the availability of services. However, traditional replication strategies are not appropriate for service-oriented systems, where diverse services may be grouped together to provide redundancy. In this paper we describe the requirements for a redundancy protocol and propose a set of processes to manage redundant service providers.