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Performance Modeling of a Quorum Pattern in Layered Service Systems

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4 Author(s)
Omari, T. ; Carleton Univ., Ottawa ; Derisavi, S. ; Franks, G. ; Woodside, M.

Quorum consensus protocols execute requests in parallel and proceed once K out of N responses are received. The performance of a system depends on the value of K, the distributions of the quorum response delays, and on the use of system resources by the N concurrent requests. An analytic approximation is given for the delay to achieve the quorum, which also accounts for the contention and delay caused by the (N - K) delayed responses. Compared to simulation results, our approximation gives reasonable accuracy; about 5% in most cases. Our method is shown to be rapid and scalable.

Published in:

Quantitative Evaluation of Systems, 2007. QEST 2007. Fourth International Conference on the

Date of Conference:

17-19 Sept. 2007