Coercing Clients Into Facilitating Failover for Object Delivery

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Executive Summary

Application-level protocols used for object delivery, such as HTTP, are built atop TCP/IP and inherit its host-to-host abstraction. Given that these services are replicated for scalability, this unnecessarily exposes failures of individual servers to their clients. While changes to both client and server applications can be used to mask such failures, this paper explores the feasibility of Transparent Recovery for unmodified Object Delivery Services (TRODS). The key insight in TRODS is cross-layer visibility and control: TRODS carefully derives reliable storage for application-level state from the mechanics of the transport layer.

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