Mapping the Gnutella Network: Properties of Large-Scale Peer-to-Peer Systems and Implications for System Design

Details Mapping the Gnutella Network: Properties of Large-Scale Peer-to-Peer Systems and Implications for System Design Mapping the Gnutella Network: Properties of Large-Scale Peer-to-Peer Systems and Implications for System Design

2002-09-25

arxiv.org/abs/cs/0209028v1

IEEE Internet Computing Journal (special issue on peer-to-peer networking), vol. 6(1) 2002

Computer Science

Distributed, Parallel, and Cluster Computing

Scientific paper

Despite recent excitement generated by the peer-to-peer (P2P) paradigm and the surprisingly rapid deployment of some P2P applications, there are few quantitative evaluations of P2P systems behavior. The open architecture, achieved scale, and self-organizing structure of the Gnutella network make it an interesting P2P architecture to study. Like most other P2P applications, Gnutella builds, at the application level, a virtual network with its own routing mechanisms. The topology of this virtual network and the routing mechanisms used have a significant influence on application properties such as performance, reliability, and scalability. We have built a "crawler" to extract the topology of Gnutella's application level network. In this paper we analyze the topology graph and evaluate generated network traffic. Our two major findings are that: (1) although Gnutella is not a pure power-law network, its current configuration has the benefits and drawbacks of a power-law structure, and (2) the Gnutella virtual network topology does not match well the underlying Internet topology, hence leading to ineffective use of the physical networking infrastructure. These findings guide us to propose changes to the Gnutella protocol and implementations that may bring significant performance and scalability improvements. We believe that our findings as well as our measurement and analysis techniques have broad applicability to P2P systems and provide unique insights into P2P system design tradeoffs.

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