AbstractWe evaluate the feasibility of using Migratory TCP (M-TCP), a reliable connection-oriented transport layer protocol that supports connection migration, for building highly available Internet services. M-TCP can transparently migrate the server endpoint of a live connection and assists server applications in resuming service on migrated connections. M-TCP provides a generic solution for the problem of service continuity and availability in the face of connectivity failures.
We have implemented M-TCP and present results of an experimental evaluation which shows it can efficiently provide support for highly available services. We illustrate the use of M-TCP in two applications. The first is a synthetic generic media streaming server. We show that, when the performance of the current server degrades, M-TCP an sustain throughput lose to the average server behavior by migrating connections to better servers. The second application is a transactional database server in which we have integrated support for migrating client connections. Using our system, a database frontend an continue the execution of a series of transactions submitted by a remote client in a session started with another front-end. The system allows a session to survive adverse conditions by connection migration, while ensuring that ACID semantics are preserved and that the execution is deterministic across migration.
SubjectsReliable transport protocols, Connection migration, Internet services, TCP, Availability, Fault tolerance
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