Adding Structure to Unstructured Peer-to-Peer Networks: The Role of Overlay Topology

Our work examines the role of overlay topology on the performance of unstructured peer-to-peer systems. We focus on two performance metrics: (a) search protocol performance, a local gain perceived directly by a user of the system and (b) utilization of the network, a global property that is of interest to network service providers. We present a class of overlay topologies based on distance between a node and its neighbors. We show, by simulation, that a particular topology instance of this class where every node has many close neighbors and few random neighbors exhibits better properties than other examined instances. In this overlay topology, the chances of locating files are high and the nodes where these files are found are, on average, close to the query source. This improvement in search protocol performance is achieved while decreasing the traffic load on the links in the underlying network. We propose a simple greedy algorithm to construct such topologies where each node operates independently and in a decentralized manner.

[1]  Andy Oram,et al.  Peer-to-Peer: Harnessing the Power of Disruptive Technologies , 2001 .

[2]  James F. Doyle,et al.  Peer-to-Peer: harnessing the power of disruptive technologies , 2001, UBIQ.

[3]  Peter Druschel,et al.  Pastry: Scalable, distributed object location and routing for large-scale peer-to- , 2001 .

[4]  David R. Karger,et al.  Chord: A scalable peer-to-peer lookup service for internet applications , 2001, SIGCOMM '01.

[5]  Bobby Bhattacharjee,et al.  Scalable peer finding on the Internet , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[6]  Ramesh Govindan,et al.  Using the small-world model to improve Freenet performance , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[7]  Sonia Fahmy,et al.  Topology-aware overlay networks for group communication , 2002, NOSSDAV '02.

[8]  Mark Handley,et al.  Topologically-aware overlay construction and server selection , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[9]  Mark Handley,et al.  A scalable content-addressable network , 2001, SIGCOMM '01.

[10]  Ian Clarke,et al.  Freenet: A Distributed Anonymous Information Storage and Retrieval System , 2000, Workshop on Design Issues in Anonymity and Unobservability.

[11]  Mark Handley,et al.  A scalable content-addressable network , 2001, SIGCOMM 2001.

[12]  Ian T. Foster,et al.  Mapping the Gnutella Network: Properties of Large-Scale Peer-to-Peer Systems and Implications for System Design , 2002, ArXiv.

[13]  Ellen W. Zegura,et al.  A quantitative comparison of graph-based models for Internet topology , 1997, TNET.

[14]  Jie Wu,et al.  Small Worlds: The Dynamics of Networks between Order and Randomness , 2003 .

[15]  Antony I. T. Rowstron,et al.  Pastry: Scalable, Decentralized Object Location, and Routing for Large-Scale Peer-to-Peer Systems , 2001, Middleware.

[16]  Duncan J. Watts,et al.  Collective dynamics of ‘small-world’ networks , 1998, Nature.

[17]  Bobby Bhattacharjee,et al.  Scalable application layer multicast , 2002, SIGCOMM '02.

[18]  M. Jovanovi.  MODELING PEER-TO-PEER NETWORK TOPOLOGIES THROUGH “ SMALL-WORLD ” MODELS AND POWER LAWS , 2001 .

[19]  Jia Wang,et al.  Analyzing peer-to-peer traffic across large networks , 2002, IMW '02.

[20]  Bruce M. Maggs,et al.  Efficient content location using interest-based locality in peer-to-peer systems , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[21]  Srinivasan Seshan,et al.  A case for end system multicast , 2002, IEEE J. Sel. Areas Commun..

[22]  Stefan Saroiu,et al.  A Measurement Study of Peer-to-Peer File Sharing Systems , 2001 .

[23]  Scott Shenker,et al.  Routing Algorithms for DHTs: Some Open Questions , 2002, IPTPS.

[24]  Bobby Bhattacharjee,et al.  Finding close friends on the Internet , 2001, Proceedings Ninth International Conference on Network Protocols. ICNP 2001.