page6 - 1 P2P File Distribution server starts out with the...

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1. P2P File Distribution – server starts out with the file and must send each bit of file out at least once into the network. a. Each user contributes to the total upload capacity. b. Bounds are still included {NF/u s , F/d min } c. Total upload capacity {u s , sum of peer u i } d. Min Distribution time is max {NF/u s , F/d min, NF/sum(u s + sum u i )} e. P2P is faster than server client even as N goes up. 2. BitTorrent – p2p sharing in which a group of peers join a torrent and begin trading chunks of a file with each other. Chunks are tracked by a tracker. a. Tracker – keeps track of who has what chunks and can send list of chunks per peer to anyone in the torrent. b. Distribution – a peer requests the rarest chunks of the file first. Chunks of which there are the least copies in torrent. Peers serve those who serve them with highest upload rate. c. Every 10 s top uploader list is updated, Every 30 s a peer sends a random peer chunks. d.
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This note was uploaded on 10/08/2008 for the course ECE 4450 taught by Professor Wicker during the Fall '07 term at Cornell.

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page6 - 1 P2P File Distribution server starts out with the...

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