Optimizing peer relationships in a super-peer network

Paweł Garbacki*, Dick H.J. Epema, Maarten van Steen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

29 Citations (Scopus)
32 Downloads (Pure)


Super-peer architectures exploit the heterogeneity of nodes in a P2P network by assigning additional responsibilities to higher-capacity nodes. In the design of a super-peer network for file sharing, several issues have to be addressed: how client peers are related to super-peers, how super-peers locate files, how the load is balanced among the super-peers, and how the system deals with node failures. In this paper we introduce a self-organizing super-peer network architecture (SOSPNET) that solves these issues in a fully decentralized manner. SOSPNET maintains a super-peer network topology that reflects the semantic similarity of peers sharing content interests. Super-peers maintain semantic caches of pointers to files which are requested by peers with similar interests. Client peers, on the other hand, dynamically select super-peers offering the best search performance. We show how this simple approach can be employed not only to optimize searching, but also to solve generally difficult problems encountered in P2P architectures such as load balancing and fault tolerance. We evaluate SOSPNET using a model of the semantic structure derived from the 8-month traces of two large file-sharing communities. The obtained results indicate that SOSPNET achieves close-to-optimal file search performance, quickly adjusts to changes in the environment (node joins and leaves), survives even catastrophic node failures, and efficiently distributes the system load taking into account peer capacities.

Original languageEnglish
Title of host publication27th International Conference on Distributed Computing Systems, ICDCS'07
Subtitle of host publicationToronto ON, Canada, June 25-27, 2007
Number of pages10
ISBN (Print)9780769528373
Publication statusPublished - 8 Oct 2007
Externally publishedYes
Event27th International Conference on Distributed Computing Systems, ICDCS 2007 - Toronto, Canada
Duration: 25 Jun 200727 Jun 2007
Conference number: 27

Publication series

NameInternational Conference on Distributed Computing Systems (ICDCS)
ISSN (Print)1063-6927


Conference27th International Conference on Distributed Computing Systems, ICDCS 2007
Abbreviated titleICDCS


  • Peer to peer computing
  • Network topology
  • Design optimization
  • Protocols
  • Load management
  • Fault tolerance
  • Network servers
  • Routing


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