Abstract

This paper presents a set of techniques for providing fine-grained failover of long-running connections across a distributed collection of replica servers, and is especially useful for fault-tolerant and load-balanced delivery of streaming media and telephony sessions. Our system achieves connection-level failover across both local- and wide-area server replication, without requiring a frontend transport- or application-layer switch. Our approach uses recently proposed end-to-end "connection migration" mechanisms for transport protocols such as TCP, combined with a soft-state session synchronization protocol between replica servers. The end

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