As distributed systems scale up and are deployed into increasingly sensitive settings, demand is rising for a new generation of communications middleware in support of application-level critical-computing uses. Ricochet, Tempest and QuickSilver are multicast-based systems developed to respond to this need. Ricochet and QuickSilver are multicast platforms; both are exceptionally scalable and support fault-tolerance properties that match closely with the needs of high-availability applications. Ricochet was designed to support time-critical applications replicated for scalability on data centers and clusters. These are typically coded in Java and run under Linux. Tempest is layered over Ricochet and automates most tasks of programming services for data centers.
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