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Cluster Computing and the Grid, IEEE International Symposium on (2009)
Shanghai, China
May 18, 2009 to May 21, 2009
ISBN: 978-0-7695-3622-4
pp: 60-67
Current implementations of real-time collaborative applications rely on a dedicated infrastructure to carry out all synchronizing and communication functions, and require all end nodes to communicate directly with and through the central server. In this paper, we investigate an architecture, in which the most resource intensive functionality of continuous communication among collaborators to disseminate changes is decentralized, utilizing the end users as relays. We observe that communication characteristics of real-time collaboration makes use of existing multicast mechanisms unsuitable. As collaborative editing sessions are typically long, we are able to gather and then use additional parameters ofnodes (their instabilities and frequency of sending updates) and communication links (latencies and average costs). We identify several criteria to determinethe quality of a multicast tree: cost, latency and instability. We analyze the complexity of these problems and propose algorithms to optimize the communicationtopology. We also consider the multiobjective problem in which we search for a tree that results in a good trade-off between these measures. Validation ofalgorithms on numerous graphs shows that it is important to consider the multiobjective problem, as optimal solutions for one performance measure can be far from optimal values of the others.
communication topology, collaborative applications, multi-objective optimization

K. Rzadca, A. Datta and J. T. Yong, "Multicast Trees for Collaborative Applications," Cluster Computing and the Grid, IEEE International Symposium on(CCGRID), Shanghai, China, 2009, pp. 60-67.
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