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Minimizing the maximum delay for reaching consensus in quorum-based mutual exclusion schemes

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3 Author(s)
Tsuchiya, T. ; Dept. of Inf. & Math. Sci., Osaka Univ., Japan ; Yamaguchi, M. ; Kikuno, T.

The use of quorums is a well-known approach to achieving mutual exclusion in distributed computing systems. This approach works based on a coterie, a special set of node groups where any pair of the node groups shares at least one common node. Each node group in a coterie is called a quorum. Mutual exclusion is ensured by imposing that a node gets consensus from all nodes in at least one of the quorums before it enters a critical section. In a quorum-based mutual exclusion scheme, the delay for reaching consensus depends critically on the coterie adopted and, thus, it is important to find a coterie with small delay. Fu (1997) introduced two related measures called max-delay and mean-delay. The former measure represents the largest delay among all nodes, while the latter is the arithmetic mean of the delays. She proposed polynomial-time algorithms for finding max-delay and mean-delay optimal coteries when the network topology is a tree or a ring. In this paper, we first propose a polynomial-time algorithm for finding max-delay optimal coteries and, then, modify the algorithm so as to reduce the mean-delay of generated coteries. Unlike the previous algorithms, the proposed algorithms can be applied to systems with arbitrary topology

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:10 ,  Issue: 4 )

Date of Publication:

Apr 1999

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