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Unraveling BitTorrent’s File Unavailability:Measurements and Analysis

Kaune, Sebastian and Rumin, Ruben Cuevas and Tyson, Gareth and Mauthe, Andreas and Guerrero, Carmen and Steinmetz, Ralf (2010) Unraveling BitTorrent’s File Unavailability:Measurements and Analysis. In: Proceedings of the IEEE 10th International Conference on Peer-to-Peer Computing (P2P '10). IEEE, pp. 1-9. ISBN 978-1-4244-7140-9

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Abstract

BitTorrent suffers from one fundamental problem: the long-term availability of content. This occurs on a massive-scale with 38% of torrents becoming unavailable within the first month. In this paper we explore this problem by performing two large-scale measurement studies including 46K torrents and 29M users. The studies go significantly beyond any previous work by combining per-node, per-torrent and system-wide observations to ascertain the causes, characteristics and repercussions of file unavailability. The study confirms the conclusion from previous works that seeders have a significant impact on both performance and availability. However, we also present some crucial new findings: (i) the presence of seeders is not the sole factor involved in file availability, (ii) 23.5% of nodes that operate in seedless torrents can finish their downloads, and (iii) BitTorrent availability is discontinuous, operating in cycles of temporary unavailability.

Item Type: Contribution in Book/Report/Proceedings
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments:
ID Code: 42498
Deposited By: ep_importer_comp
Deposited On: 29 Jun 2010 13:19
Refereed?: No
Published?: Published
Last Modified: 23 Jul 2014 15:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/42498

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