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Georgios Smaragdakis' Publications

Distributed Server Migration for Scalable Internet Service Deployment
Zitatschlüssel SLOSB-DSMSISD-12
Autor Smaragdakis, Georgios and Laoutaris, Nikolaos and Oikonomou, Konstantinos and Stavrakakis, Ioannis and Bestavros, Azer
Jahr 2012
ISSN 1063-6692
Journal IEEE/ACM Transactions on Networking (ToN)
Zusammenfassung The effectiveness of service provisioning in large-scale networks is highly dependent on the number and location of service facilities deployed at various hosts. The classical, centralized approach to determining the latter would amount to formulating and solving the uncapacitated k-median (UKM) problem (if the requested number of facilities is fixed), or the uncapacitated facility location (UFL) problem (if the number of facilities is also to be optimized). Clearly, such centralized approaches require knowledge of global topological and demand information, and thus do not scale and are not practical for large networks. The key question posed and answered in this paper is the following: ``How can we determine in a distributed and scalable manner the number and location of service facilities?'' We propose an innovative approach in which topology and demand information is limited to neighborhoods, or ''balls'' of small radius around selected facilities, whereas demand information is captured implicitly for the remaining (remote) clients outside these neighborhoods, by mapping them to clients on the edge of the neighborhood; the ball radius regulates the trade-off between scalability and performance. We develop a scalable, distributed approach that answers our key question through an iterative re-optimization of the location and the number of facilities within such balls. We show that even for small values of the radius (1 or 2), our distributed approach achieves performance under various synthetic and real Internet topologies and workloads that is comparable to that of optimal, centralized approaches requiring full topology and demand information.
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