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2010
IEEE

Unraveling BitTorrent's File Unavailability: Measurements and Analysis

9 years 25 days ago
Unraveling BitTorrent's File Unavailability: Measurements and Analysis
—BitTorrent suffers from one fundamental problem: the long-term availability of content. This occurs on a massivescale 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.
Sebastian Kaune, Rubén Cuevas Rumín,
Added 29 Jan 2011
Updated 29 Jan 2011
Type Journal
Year 2010
Where P2P
Authors Sebastian Kaune, Rubén Cuevas Rumín, Gareth Tyson, Andreas Mauthe, Carmen Guerrero, Ralf Steinmetz
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