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?