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The Computer Journal Advance Access published online on July 1, 2009
The Computer Journal, doi:10.1093/comjnl/bxp062
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© The Author 2009. Published by Oxford University Press on behalf of The British Computer Society. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Robust Super-Peer-Based P2P File-Sharing Systems

Jenn-Wei Lin* and Ming-Feng Yang

Department of Computer Science and Information Engineering, Fu Jen Catholic University, No. 510, Jhongjheng Rd., Sinjhuang City, Taipei County 24205, Taiwan, ROC

* Corresponding author: jwlin{at}csie.fju.edu.tw

Received 2 January 2009; revised 3 June 2009

This paper presents an efficient approach for improving file availability in super-peer-based peer-to-peer (P2P) file-sharing systems. In the super-peer-based P2P file-sharing system, peers are organized into multiple groups. In each group, there is a special peer called super-peer to serve the regular peers within the same group. With this property, the proposed approach utilizes the super-peer to tolerate the departure (failure) of a regular peer in order to protect shared files. Unlike traditional replication-based approaches, the proposed approach keeps track of the file queries in the super-peer to support fault tolerance. The cost of tracking the file queries is much smaller than the cost of replicating the file contents in advance. Furthermore, the proposed approach uses a logical connection technique to consider the departure (failure) of the super-peer. Finally, simulation experiments are performed to quantify the performance and overhead of the proposed approach.

Key Words: file availability • peer-to-peer • file-sharing systems • departure • failure

Handling editor: Ing-Ray Chen


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