Thesis /

ROMDOC-THESIS-2017-984

Overlay communication improvements in Peer-to-Peer systems

Milescu, George
2011-09-26

Abstract: Overlay networks are basic foundations on top of which P2P protocols are built. The current thesis analyses the structures and functions of the overlay. The BitTorrent protocol is presented as the file sharing protocol with the largest chunk of Internet traffic. Key areas of the BitTorrent protocol are identified where inter-node communication can be improved. The thesis proposed novel models and solutions for enhancing the efficiency of BitTorrent data transfer. A novel BitTorrent protocol extension is introduced that uses a series of proxy nodes for distributing available bandwidth among peers (thus increasing transfer performance) and offering an enhanced privacy protection. A proxy discovery protocol is proposed, disseminating the relays available in the network. An overlay behavior model is introduced, with three components evaluating the performance, efficiency and reliability of an file-sharing P2P system. To control P2P experiments, an evaluation testbed is introduced, that reproduces realistic network conditions within a computer cluster. Lightweight virtualization solutions are being used to create clusters with up to 350 machines. The obtained results are validated in a series of experiments and technical trials. A cluster of 350 machines is used to recreate complex scenarios. A trial using 20.000 clients over a period of two months places the proposed solutions in real network environments.

Keyword(s): Protocolul BitTorrent -- Comunicaţii de date (Calculatoare) -- Teză de doctorat ; Arhitectura reţelelor de calculatoare -- Teză de doctorat ; Sisteme distribuite -- Sisteme de comunicaţie -- Teză de doctorat
OPAC: See record in BC-UPB Web OPAC
Full Text: see files

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