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Globally Distributed Content Delivery

This presentation by Baoning Wu explores the intricacies of globally distributed content delivery systems, focusing on the Flash crowd problem and its impact on web performance. High load can lead to site crashes and increased response times. Akamai’s infrastructure allocates servers based on real-time demands, directing client requests efficiently to the nearest server with the requested content. Key topics include dynamic DNS systems, network services, and handling static and dynamic content. The presentation addresses challenges such as scalability, reliability, content visibility, and control.

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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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