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Intitulé:   
Sém LaBRI. The Next 700 BFT Protocols
du groupe Séminaire du LaBRI

Date 2010-10-07  13:30-14:00
TitreSém LaBRI. The Next 700 BFT Protocols 
RésuméByzantine fault-tolerant state machine replication (BFT) has reached a reasonable level of maturity as an appealing, software-based technique, to building robust distributed services with commodity hardware. The current tendency however is to implement a new BFT protocol from scratch for each new application and network environment. This is notoriously difficult. Modern BFT protocols require each more than 20.000 lines of sophisticated C code and proving their correctness involves an entire PhD. Maintaining and testing each new protocol seems just impossible. This talk will present a candidate abstraction, named ABSTRACT (Abortable State Machine Replication), to remedy this situation. A BFT protocol is viewed as a, possibly dynamic, composition of instances of ABSTRACT, each instance developed and analyzed independently. A new effective BFT protocol can be developped by adding less than 10% of code to an existing one. Correctness proofs become at human reach and even model checking techniques can be envisaged. To illustrate the ABSTRACT approach, we describe a new BFT protocol we name Aliph: the first of a hopefully long series of effective yet modular BFT protocols. The Aliph protocol has a peak throughput that outperforms those of all BFT protocols we know of by 300% and a best case latency that is less than 30% of that of state of the art BFT protocols. This is joint work with Prof. R. Guerraoui (EPFL) and Dr M. Vukolic (IBM). 
LieuAmphi LaBRI 
OrateurVivien Quéma 
UrlLIG, Grenoble 



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