Web Caching and CDNs March 3, 2004. Content Distribution Motivation –Network path from server to client is slow/congested –Web server is overloaded Web.

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Presentation transcript:

Web Caching and CDNs March 3, 2004

Content Distribution Motivation –Network path from server to client is slow/congested –Web server is overloaded Web Caching –Store content in cache near client CDNs –Actively replicate content at servers in network Peer-to-Peer File Sharing

Scenario origin server Content Provider

Scenario origin server Content Provider proxy server

Benefits Reduce response time for client request Reduce traffic on an institution’s access link. Internet dense with caches enables “poor” content providers to effectively deliver content

Drawbacks?

Latency –Cooperative caching = even greater latency Cost of deploying proxy server Stale data

Content distribution networks (CDNs) origin server in North America CDN distribution node CDN server in S. America CDN server in Europe CDN server in Asia

CDNs Request base object from origin server –Objects to be fetched from CDN have URL DNS lookup for –DNS server maps to closest server Request objects from

CDNs vs. Caching?

Different business models –CDNs = no infrastructure required for client CDNs use push model to keep data fresh CDNs don’t incur latency of cache miss

P2P Relationship of CDNs, caching, and P2P model?

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