A FAULT-TOLERANT RPC MECHANISM-BASED ON IP MULTICASTING

This paper presents a fault tolerant Remote Procedure Call (RPC) mecha nism based on Sun RPC and IP multicast protocol. The fault tolerant RP C mechanism is provided as an RPC library, called libFTRPC, whose inte rface is compatible with that of conventional Sun's RPC library. Thank s to this compatibility, a reliable RPC server can be developed in the same way a conventional RPC server is constructed. The service reliab ility is ensured by replicating the server to a group of server replic as. Coordinator-cohort replication model in conjunction with read-one/ write-all policy is used to guarantee state consistency between server replicas. We also incorporate a simple and effective approach to bala nce loads among server replicas to improve performance for read-only r equests.