Ofthe many P2P file-sharing prototypes in existence, BitTorrent is one of the few that has managed to attract millions of users. BitTorrent relies on other (global) components for file search, employs a moderator system to
ensure the integrity of file data, and uses a bartering technique for downloading in order to prevent users from
freeriding. In this paper we present a measurement study
ofBitTorrent in which we focus on four issues, viz. availability, integrity, flashcrowd handling, and download performance. The purpose of this paper is to aid in the understanding of a real P2P system that apparently has the
right mechanisms to attract a large user community, to
provide measurement data that may be useful in modeling P2P systems, and to identify design issues in such
systems.
Ofthe many P2P file-sharing prototypes in existence, BitTorrent is one of the few that has managed to attract millions of users. BitTorrent relies on other (global) components for file search, employs a moderator system toensure the integrity of file data, and uses a bartering technique for downloading in order to prevent users fromfreeriding. In this paper we present a measurement studyofBitTorrent in which we focus on four issues, viz. availability, integrity, flashcrowd handling, and download performance. The purpose of this paper is to aid in the understanding of a real P2P system that apparently has theright mechanisms to attract a large user community, toprovide measurement data that may be useful in modeling P2P systems, and to identify design issues in suchsystems.
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