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1 PLANETE - Protocols and applications for the Internet Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée 2 ASAP - As Scalable As Possible: foundations of large scale dynamic distributed systems UR1 - Université de Rennes 1, Inria Saclay - Ile de France, INSA - Institut National des Sciences Appliquées, CNRS - Centre National de la Recherche Scientifique : UMR 3 ASAP - As Scalable As Possible: foundations of large scale dynamic distributed systems Inria Rennes – Bretagne Atlantique , IRISA-D1 - SYSTÈMES LARGE ÉCHELLE

Abstract : We study the problem of finding peers matching a given availability pattern in a peer-to-peer P2P system. Motivated by practical examples, we specify two formal problems of availability matching that arise in real applications: disconnection matching, where peers look for partners expected to disconnect at the same time, and presence matching, where peers look for partners expected to be online simultaneously in the future. As a scalable and inexpensive solution, we propose to use epidemic protocols for topology management; we provide corresponding metrics for both matching problems. We evaluated this solution by simulating two P2P applications, task scheduling and file storage, over a new trace of the eDonkey network, the largest available with availability information. We first proved the existence of regularity patterns in the sessions of 14M peers over 27 days. We also showed that, using only 7 days of history, a simple predictor could select predictable peers and successfully predicted their online periods for the next week. Finally, simulations showed that our simple solution provided good partners fast enough to match the needs of both applications, and that consequently, these applications performed as efficiently at a much lower cost. We believe that this work will be useful for many P2P applications for which it has been shown that choosing good partners, based on their availability, drastically improves their performance and stability.





Author: Stevens Le Blond - Fabrice Le Fessant - Erwan Le Merrer -

Source: https://hal.archives-ouvertes.fr/



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