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Gossip versus Deterministically Constrained Flooding on Small Networks

Meng-Jang Lin5, Keith Marzullo6 and Stefano Masini7

(5)  Somerset Design Center, Motorola, Inc., Austin, TX
(6)  Department of Computer Science and Engineering, University of California San Diego, La Jolla, CA
(7)  Department of Computer Science, University of Bologna, Bologna, Italy
Abstract
Rumor mongering (also known as gossip) is an epidemiolog- ical protocol that implements broadcasting with a reliability that can be very high. Rumor mongering is attractive because it is generic, scalable, adapts well to failures and recoveries, and has a reliability that gracefully degrades with the number of failures in a run. However, rumor mongering uses random selection for communications. We study the impact of using random selection in this paper. We present a protocol that superficially resembles rumor mongering but is deterministic. We show that this new protocol has most of the same attractions as rumor mongering. The one remaining attraction that rumor mongering has over the determinisitic protocol-namely graceful degradation-comes at a high cost in terms of the number of messages sent. We compare the two approaches both at an abstract level and in terms of how they perform in an Ethernet and small wide area network of Ethernets.
This research was support in part by DARPA grant N66001-98-8911 and NSF award CCR-9803743. Most of this work was done when Dr Lin was a graduate student at UT Austin.

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