Issue No.09 - September (2007 vol.18)
Peer-to-Peer (P2P) model, being widely adopted in today’s Internet computing, suffers from the problem of topology mismatch between the overlay networks and the underlying physical network. Traditional topology optimization techniques identify physical closer nodes to connect as overlay neighbors, but could significantly shrink the search scope. Recent efforts have been made to address the mismatch problem without sacrificing search scope, but they either need time synchronization among peers or have a low convergent speed. In this paper, we propose a scalable bipartite overlay (SBO) scheme to optimize the overlay topology by identifying and replacing the mismatched connections. In SBO, we employ an efficient strategy for distributing optimization tasks in peers with different colors. We conducted comprehensive simulations to evaluate this design. The results show that SBO achieves approximately 85% reduction on traffic cost and about 60% reduction on query response time. Our comparisons with previous approaches to address the topology mismatch problem have shown that SBO can achieve fast convergent speed without the need of time synchronization among peers.
Unstructured Peer-to-Peer, topology mismatch, overlay, bipartite, search efficiency
Yunhao Liu, Li Xiao, Lionel Ni, "Building a Scalable Bipartite P2P Overlay Network", IEEE Transactions on Parallel & Distributed Systems, vol.18, no. 9, pp. 1296-1306, September 2007, doi:10.1109/TPDS.2007.1059