Course-Review.pdf - ELEN E6776 Content Distribution Networks Brief Course Review(Please review individual lecture material for more details and

Course-Review.pdf - ELEN E6776 Content Distribution...

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ELEN E6776: Content Distribution Networks Brief Course Review (Please review individual lecture material for more details and references)
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Course Topics Content Characterization and Modeling Popularity Temporal and spatial localities Bandwidth and storage requirements Dynamicity Client-Server CDNs Caching Hit rate calculation effects of popularity distribution, population size, file size Online caching algorithms Hierarchical caching Bloom Filters for Cooperative Caching CDNs Surrogate Server Placement Object Placement Request Routing CDN Examples (Akamai, Limelight) CDN customers (e.g. YouTube) Telco CDNs IPTV example
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P2P Centralized/ Distributed Structured/Unstructured BitTorrent Fluid Modeling and analysis Incentive Mechanisms VoIP: Skype P2P Streaming: PPlive DHT’s Chord Discussions of CAN and other topologies Application of Network coding Hybrid P2P and client-server CDNs (peer- assisted CDN’s) Optimal server dimensioning Interactions between P2P networks and ISP’s Effect of P2P traffic on ISP networks Emerging P4P paradigm: Cooperation of P2P and ISPs. Other topics: (not to be covered in the final exam; covered in projects ) Social Networks Cloud computing Mobile P2P and CDNs Blockchain Content Centric Networking (CCN)
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Content Networking Study of content Networks involves: Marketing and Pricing Protocols and technology Optimization problems and algorithms Measurements and analysis
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How it started - Centralized Web! Slow “middle mile” (Internet) Content must traverse multiple backbones and long distances Unreliable Due to congestion or backbone peering problems Not scalable Constrained by resources at root server Flash crowd problem
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Arbitrate client requests to servers using L4-L7 switch Solution does not address end-to-end latency problem Solution L4-L7 Switch (Copy 1) (Copy 3) (Copy 2) Server Farms:
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Solution 1 2 HTTP request HTTP response 1 1 1 2 2 2 2 1 Client1 Client2 Proxy Server (Cache) Origin Server Client3 Problems: Large percentage of HTTP objects are not cacheable Hit rates typically not high Content providers need to know # of hits for advertisements and revenues Content providers cannot rely on existence and correct implementation of caching proxies Forward Caching:
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Solution Content Distribution Networks (CDN) Overlay network which provides a “rendezvous” between end -user and content provider Move content to the “edge” of the internet, close to end users Advantages Reduced root server load Reduced end-to-end latency Traffic loads distributed and routed around congested networks
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CDN Players and Transactions CDN provides scale & reach to content providers (CPs) at cost Replace e2e connection with two connections: CP-CDN and CDN-user CDN provider collects $$ from CPs and spends $ on Capex and Opex (transport, servers, collocation, management)
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