Evolution of Peer-to-Peer File Sharing Technologies

Explore the evolution of peer-to-peer file sharing technologies through a detailed overview of nTorrent, Data-centricity, TCP/IP hurdles, and common design elements between BitTorrent and NDN. Delve into the challenges, solutions, and innovative approaches in securely retrieving torrents with hierarchical namespaces and file manifests. Discover the intricate network architectures and data distribution mechanisms shaping the future of file sharing networks.

• Peer-to-Peer
• File Sharing
• Technology Evolution
• Data-centricity
• Torrent Retrieval

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1. nTorrent nTorrent: Peer Named Data Networking Named Data Networking : Peer- -to to- -Peer File Sharing in Peer File Sharing in NDNcomm 2017 Macrh 23 24 Memphis Spyridon (Spyros) Mastorakis University of California, Los Angeles 9/23/2024 NDNcomm 2017 1

2. Data Data- -Centricity & Peer Centricity & Peer- -to to- -Peer File Sharing Peer File Sharing Data-centricity at different layers (applicationvsnetwork) for peer-to-peer file sharing BitTorrent (BT): peer-to-peer file sharing application in TCP/IP Robust & efficient data distribution Data-centricity at the application layer Point-to-point TCP/IP packet delivery at transport & network layers No network-layer knowledge Named Data Networking: Data-centricity directly at network layer How easy/difficult to design an application with similar objective? 9/23/2024 NDNcomm 2017 2

3. TCP/IP Hurdles to TCP/IP Hurdles to BitTorrent BitTorrent Tracker or DHT node Torrent File Torrent File Let s share the piece now! This guy is not uploading enough. Which peer to fetch data from? Have to try them all! Download first from whoever has the rarest piece! Got a piece. Have to verify it.. Are there any peers in my network? I want to download the torrent. Anybody else around???? Who is the closest one? Have to choke him 9/23/2024 NDNcomm 2017 3

4. Common Design Elements Between BT and NDN Common Design Elements Between BT and NDN 9/23/2024 NDNcomm 2017 4

5. nTorrent nTorrent Design Goal: Securely retrieve a torrent. It may consist of: one or more files each file of a number of data packets 3 main design abstractions: 1) Torrent file, 2) File Manifest, 3) Packet in a file Design File Manifest: catalog of full packet names in a file NDNcomm 2017 Torrent File contains the full names of file manifests Full Packet Names: Integrity guaranteed by network Through website, via email, via friend.. 5 9/23/2024

6. Hierarchical Namespace Hierarchical Namespace Torrent-File /NTORRENT/funny_videos/torrent-file/1a34bc22 File Manifests . /NTORRENT/funny_videos/file1/a13bcd22 /NTORRENT/funny_videos/file10/2b2cad34 /NTORRENT/funny_videos/file0/23acd5a6 Data Packets in File /NTORRENT/funny_videos/file0/ packet0/12bdd4a6 . /NTORRENT/funny_videos/file0/ packet1/23bac5b1 /NTORRENT/funny_videos/file0/ packet10/a32cd22 9/23/2024 NDNcomm 2017 6

7. Utilizing In Utilizing In- -Network Caching Network Caching How to fetch data? Peer 2 Random Fashion? Sequentially? Fetch packet 2 of file 1! of file 0! Fetch packet 0 Data for packet 10 Data for packet 0 of file 0 of file 5! NFD NFD Peer 1 NFD Fetch packet 10 of file 5! of file 0! Fetch packet 0 Unlikely to fetch data from cache! simultaneous downloads! Fetch data from cache for 9/23/2024 NDNcomm 2017 7

8. Routing Scalability Routing Scalability Granularity of prefix to announce: a) torrent prefix b) file prefix c) data packet prefix Trade-off: Announcement granularityvs FIB size vs Forwarding plane accuracy 9/23/2024 NDNcomm 2017 8

9. Routing Scalability (contd) Routing Scalability (cont d) When to do the announcement: a) when a peerstarts downloading data of announced prefix b) when a peer downloads all the data of announced prefix c) when a peer downloads some data of announced prefix Trade-off: Announcement timing vs Peer agility vs Forwarding plane accuracy 9/23/2024 NDNcomm 2017 9

10. nTorrent nTorrent Implementation Implementation Implementation (almost ready to use, have been tested and debugged on the NDN testbed): https://github.com/spirosmastorakis/nTorrent Documentation to come soon Implementation to be ported to ndnSIM soon 9/23/2024 NDNcomm 2017 10

11. Peer Peer- -to to- -Peer File Sharing in NDN Terms Peer File Sharing in NDN Terms Peer acts as producer and consumer at the same time Peer does not have to explicitly discover others No need for a tracker Elimination of redundant fetching, reduction of network load and retrieval time Peer never receives bogus data 9/23/2024 NDNcomm 2017 11