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Rethinking State-Machine Replication for Multicore Architectures

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The advent of multicore processors and their wide availability has revolutionized systems programming and application development strategies. To increase their capacity to serve clients and to benefit from the new hardware, service providers have to parallelize their services. Similarly to their sequential predecessors, however, parallel services must also be continually available to the clients, despite failures. State-machine replication is a well-established strategy to make services fault tolerant. In this talk we will look at the capability of the state-machine approach in replicating parallel services. On the one hand, parallel applications require concurrent processing of requests to provide high performance and on the other hand, state-machine replication requires sequential processing of requests to preserve consistency. During this presentation we will consider the possibility of uniting these two apparently incompatible models and will propose a scalable solution.

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