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Summary: Practical Cluster Applications of Group Communication
Yair Amir, Yan Gu, Theo Schlossnagle, Jonathan Stanton
Department of Computer Science
The Johns Hopkins University
Baltimore, Maryland 21218 USA
yairamir, yangu, theos, jonathan @cnds.jhu.edu
Abstract
Group communication systems are used to build fault-
tolerant and replicated services. However, they also can be
very useful for building tools that support a highly avail-
able web cluster, or help manage a large collection of ma-
chines. This paper explores the features of one particular
Group communication system called SpreadTM
that are use-
ful in this environment and describes two specific applica-
tions that we built and actively use. These applications are a
distributed system logging tool and an IP based high avail-
ability fail-over tool for clusters.
1. Introduction
Group communication has been used for many years in
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