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Safe Peer-to-Peer Self-Downloading KAJARI GHOSH DASTIDAR and TED HERMAN University of Iowa and COLETTE JOHNEN University of Bordeaux 1 A goal of peer-to-peer applications is to share les between users themselves rather than downloading les from le servers. Self-downloading protocols have the property that, eventually, every user downloads only from other users. Self-downloading is problematic if users disconnect from the system upon completing le downloading, because they only share with other users while connected. Yet, if users continue to arrive at a suf cient rate, self-downloading protocols are possible. One vulnerability of le sharing between users is the possibility that les or segments could be counterfeit or corrupt. Protocols that are d -safe tolerate some number of instances of faulty segments in a le being downloaded, because each segment is downloaded d times before being shared. This article shows that d-safe self-downloading is possible for a suf ciently large arrival rate of users to the system. Upper and lower connectivity and sharing bounds are given for d = 2, and simulation results show effects of relaxing assumptions about arrival rates and bandwidth. Categories and Subject Descriptors: C.2.4 [Computer-Communication Networks]: Distributed Systems Distributed applications; C.4 [Performance of Systems]: Reliability,
ACM Transactions on Autonomous and Adaptive Systems (TAAS) – Association for Computing Machinery
Published: Nov 1, 2008
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