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Practical Cluster Applications of Group Communication

Group communication systems are used to build faulttolerant and replicated services. However, they also can be very useful for building tools that support a highly available web cluster, or help manage a large collection of machines. This paper explores the features of one particular Group communicationsystem called Spread TM that are useful in this environment and describes two specificapplications that we built and actively use. These applicationsare a distributed system logging tool and an IP based high availability fail-over tool for clusters.