Cmpe 494 Peer-to-Peer Computing Anıl Gürsel Didem Unat.

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Presentation transcript:

Cmpe 494 Peer-to-Peer Computing Anıl Gürsel Didem Unat

Goals of P2P Cost sharing/reduction Improved scalability/reliability Resource aggregation and interoperability Increased autonomy Anonymity/privacy Dynamism Enabling ad-hoc communication and collaboration

P2P Models Pure P2P No central server exists. All peers have similar properties. Hybrid P2P Meta-data of a peer is learned from central server, then direct conneciton is established with peer. (1) Initial communication with a server, e.g. to obtain the location/identity of a peer (2) Direct communication with a peer

P2P Infrastructure Components

P2P Algorithms Central Index Algorithm Flooded Requests Algorithm Document Routing Algorithm

P2P Systems Distributed computing - Desktop machines most often underutilized - Problem is divided into small parts - Peers return results to central server File sharing P2P Communication IM services, chat, online games Skype-voice over IP P2P platforms JXTA and.NET

Distributed Computing Also called Grid computing Research and financial domain Computational Problems and Data Grids Simulations, Genome Project, Cancer Research, Weather Forecast Projects: Globus, LCG, See-Grid, Needit scales well for SPMD problems supercomputing for a low price Checkpoints and Virtual Organizations Hard to parallelize the problem Security and Resource Management

File Sharing Napster + mp3 file sharing and searching service + centralized directory model Gnutella +purely distributed system + queries are sent to the peers they know, TTL + if a query match is found then the file is sent - flooding is not efficient, downloads entire file from a single peer. No checkpoint.

File Sharing-BitTorrent Hybrid p2p solution More collaborative communities Low rate of freeriding Key concepts : trackers and torrent While downloading, upload to others Age and share ratio

P2P Platforms JXTA and.NET JXTA introduced by Sun, 2001, open source - p2p protocols - cell phones, PDA, PC can connect and communicate - enables collaboration, sharing compute services - developers can create new p2p applications, JXTA provides necessary infrastructure for them - supports multiple platforms and languages, micro- devices to servers - uses Java and XML

JXTA Virtual Network

Summary Decentralization Scalability Anonymity Self-Organization Cost of Ownership Performance Security Transparency and Usability