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Globally Distributed Content Delivery

Globally Distributed Content Delivery. Presenter: Baoning Wu 03/25/2003. Motivation. Flash crowd problem Overload can crash web sites and cause high response time Akamai’s system. Akamai’s network infrastructure.

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Globally Distributed Content Delivery

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  1. Globally Distributed Content Delivery Presenter: Baoning Wu 03/25/2003

  2. Motivation • Flash crowd problem • Overload can crash web sites and cause high response time • Akamai’s system

  3. Akamai’s network infrastructure • Allocate more servers to sites experiencing high load and serve all clients from nearby servers. • The system directs client requests to the nearest available server likely to have the requested content.

  4. How to find servers? • Dynamic DNS system

  5. Criteria for name servers to resolve IP address • Service requested • Server health • Server load • Network condition • Client location • Content requested

  6. DNS resolution • A7.g.akamai.net • Root name server -> • .net name server -> • .akamai.net name server(top level)-> • .g.akamai.net name server(low level)

  7. Network services • Static content • Use cache, apply lifetime • Dynamic content • Assemble dynamic content on edge server • Streaming media • Windows Media, Real, Apple’s QuickTime

  8. Challenges • Scalability • Must scale to many distributed servers • Reliability • Both hardware and software • Software deployment • Deploy new network software in stages

  9. Challenges (continue) • Content visibility and control • Cache consistency • Lifetime control • Authentication and authorization • Integrity control • Visibility into access patterns • billing

  10. Questions?

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