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Issue No.09 - September (2009 vol.20)
pp: 1339-1351
Pedro Fonseca , Max Planck Institute for Software Systems (MPI-SWS), Kaiserslautern and Saarbrücken
Rodrigo Rodrigues , Max Planck Institute for Software Systems (MPI-SWS), Kaiserslautern and Saarbrück
Anjali Gupta , The Wellcome Trust Centre for Human Genetics, Oxford
Barbara Liskov , Massachusetts Institute of Technology, Cambridge
Most peer-to-peer lookup schemes keep a small amount of routing state per node, typically logarithmic in the number of overlay nodes. This design assumes that routing information at each member node must be kept small so that the bookkeeping required to respond to system membership changes is also small, given that aggressive membership dynamics are expected. As a consequence, lookups have high latency as each lookup requires contacting several nodes in sequence. In this paper, we question these assumptions by presenting a peer-to-peer routing algorithm with small lookup paths. Our algorithm, called “OneHop,” maintains full information about the system membership at each node, routing in a single hop whenever that information is up to date and in a small number of hops otherwise. We show how to disseminate information about membership changes quickly enough so that nodes maintain accurate complete membership information. We also present analytic bandwidth requirements for our scheme that demonstrate that it could be deployed in systems with hundreds of thousands of nodes and high churn. We validate our analytic model using a simulated environment and a real implementation. Our results confirm that OneHop is able to achieve high efficiency, usually reaching the correct node directly 99 percent of the time.
Distributed systems, peer to peer, network topology, routing protocol, distributed data structures.
Pedro Fonseca, Rodrigo Rodrigues, Anjali Gupta, Barbara Liskov, "Full-Information Lookups for Peer-to-Peer Overlays", IEEE Transactions on Parallel & Distributed Systems, vol.20, no. 9, pp. 1339-1351, September 2009, doi:10.1109/TPDS.2008.222
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