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Consensus with dual failure modes

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2 Author(s)
Meyer, F.J. ; Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA ; Pradhan, D.K.

The problem of achieving consensus in a distributed system is discussed. Systems are treated in which either or both of two types of faults may occur: dormant (essentially omission and timing faults) and arbitrary (exhibiting arbitrary behavior, commonly referred to as Byzantine). Previous results showed that are number of dormant faults may be tolerated when there are no arbitrary faults and that, at most, [n-1/3] arbitrary faults may be tolerated when there are no dormant faults (n is the number of processors). A continuum is established between the previous results: an algorithm exists iff n >fmax+2mmax and c >fmax+mmax (where c is the system connectivity), when faults are constrained so that there are at most fmax and at most mmax of these that are arbitrary. An algorithm is given and compared to known algorithms. A method is given to establish virtual links so that the communications graph appears completely connected

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:2 ,  Issue: 2 )

Date of Publication:

Apr 1991

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