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Abstract Efficient Broadcast in Structured P2P Networks.pdf

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Efficient Broadcast in Structured P2P Networks Sameh El-Ansary1, Luc Onana Alima2, Per Brand1, Seif Haridi2 1Swedish Institute of Computer Science, Kista, Sweden 2IMIT-Royal Institute of Technology, Kista, Sweden {sameh, perbrand}@sics.se, {onana, seif}@it.kth.se ? Abstract In this position paper, we present an efficient algorithm for performing a broadcast operation with minimal cost in structured DHT-based P2P networks. In a system of N nodes, a broadcast message originating at an arbitrary node reaches all other nodes after exactlyN?1 messages. We emphasize the perception of a class of DHT systems as a form of distributed k-ary search and we take ad- vantage of that perception in constructing a spanning tree that is utilized for efficient broadcasting. We con- sider broadcasting as a basic service that adds to existing DHTs the ability to search using arbitrary queries as well as dissiminate/collect global information. 1 Introduction Research in P2P systems resulted in the creation of many Data/Resource- location systems. Two approaches were used to tackle this problem; the flooding approach and the Distributed Hash Table approach approach. The common characteristic of both approaches is the con- struction of an application-level overlay network. Table 1 includes some of the major differences between the two approaches. Flooding DHT Queries Arbitrary Key Lookup Query-Induced Traffic O(N) O(log(N)) Hit Guarantees Low High Connectivity Graph Random Structured Table 1: Flooding Approach vs. DHT Approach The DHT approach with a structured overlay network, determinism, relatively low traffic and high guarantees is currently perceived in the P2P research community as the ”reasonable” approach. Many systems were con- structed based on that approach such as Tapestry [15], Pastry [11], CAN [8], Chord [12], Kademlia [7]. In con- trast, the flooding-based approach represented by [4, 3] ?This work is funded by the Swedish funding agency VIN- NOVA, PPC project and by the Euro
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