Distributed transactions are a well-known abstrac- tion for simplifying distributed systems. Because FUSE provides weaker semantics than distributed transactions, FUSE can maintain its semantic guarantees under net- work failures that cause distributed transactions to block. Theoretical results on consensus show that the possibility of blocking is fundamental to any protocol for distributed transactions.
Two of the design choices we made in building FUSE were also recommended by recent works dealing with the architectural design of network protocols. Ji et al. surveyed hard-state and soft-state signaling mechanisms across a broad class of network protocols, and recom- mended a soft state approach combining timers with ex- plicit revocation: FUSE does this. Mogul et al. ar- gued that state maintained by network protocol imple- mentations should be exposed to clients of those proto- cols. we modified our overlay routing layer to expose a mechanism for FUSE to piggy- back content on overlay maintenance traffic.
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