CS5412: TORRENTS AND TIT-FOR-TAT

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22 Contents of .torrent file URL of tracker Piece length – Usually 256 KB SHA-1 hashes of each piece in file For reliability “files” – allows download of multiple files <strong>CS5412</strong> Spring 2012 (Cloud Computing: Birman)
23 Terminology Seed: peer with the entire file Original Seed: The first seed Leech: peer that’s downloading the file Fairer term might have been “downloader” Sub-piece: Further subdivision of a piece The “unit for requests” is a subpiece But a peer uploads only after assembling complete piece <strong>CS5412</strong> Spring 2012 (Cloud Computing: Birman)
Page 1 and 2: Lecture VI CS5412: TORRENTS AND TIT
Page 3 and 4: 3 The basic BitTorrent Scenario Mi
Page 5 and 6: 5 Source Router “Interested” En
Page 7 and 8: 7 Client-Server Source Router “In
Page 9 and 10: 9 End-host based multicast Source R
Page 11 and 12: 11 End-host based multicast Also c
Page 13 and 14: 13 End-host multicast using single
Page 15 and 16: 15 End-host multicast using single
Page 17 and 18: 17 BitTorrent Swarm Swarm Set of
Page 19 and 20: Peer How a node enters a swarm for
Page 21: Peer How a node enters a swarm for
Page 25 and 26: 25 Choosing pieces to request Rand
Page 27 and 28: 27 Tit-for-tat as incentive to uplo
Page 29 and 30: 29 Why BitTorrent took off Better
Page 31 and 32: 31 Pros and cons of BitTorrent Pro
Page 33 and 34: 33 Pros and cons of BitTorrent Dep
Page 35 and 36: 35 Prior to Netflix “explosion”
Page 37 and 38: 37 Example finding from a recent st
Page 39 and 40: 39 Basic strategy They assume cryp
Page 41 and 42: 41 Obvious concern: Failed key exch
Page 43 and 44: 43 Insights gained? Collaborative

CS5412: TORRENTS AND TIT-FOR-TAT

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