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A First Look at a Hybrid Content Delivery System

A First Look at a Hybrid Content Delivery System. Ming-Chen Zhao, Paarijaat Aditya , Yin Lin Andreas Haeberlen , Peter Druschel , Bruce Maggs , and William Wishon. Akamai Network Deployment. 1795+ POPs. 85800 + Servers. 1000 + Networks. 79 + Countries.

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A First Look at a Hybrid Content Delivery System

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  1. A First Look at a Hybrid Content Delivery System Ming-Chen Zhao, PaarijaatAditya, Yin Lin Andreas Haeberlen, Peter Druschel, Bruce Maggs, and William Wishon

  2. Akamai Network Deployment 1795+POPs 85800+Servers 1000+Networks 79+Countries

  3. Akamai Peak Instant and Daily Statistics • Bit rate (01/09/11): 4.8 Tbps • Request rate (02/21/11): 16.7 million hits/sec • Bytes delivered (12/27/10): 42.3 Pbytes • HTTP requests received(02/21/11): 961.5 billion • Unique client IPs (02/16/11): 471.5 million

  4. Download Manager Product/Service • Hybrid between a fixed-infrastructure CDN and a pure peer-to-peer delivery system • Based on technology developed by Red Swoosh (acquired by Akamai in 2007) • Goal is to deliver large files at lower cost • In beta operation today

  5. NetSession Interface • client-side software • runs as a service on Windows or MacOS • provides an API to installation software or browser • stays connected to an Akamai Control Node • each installation is supposed to have a unique GUID

  6. Growth in Number of Installations Full product roll-out expected summer 2011.

  7. Architecture • BitTorrent-like protocol with control nodes serving as “trackers” and assigning peers • CDN acts as a backstop Peers Akamai Edge Servers Akamai Control Nodes

  8. Logging • Content providers want all downloads to be logged • Peers must report P2P downloads to control nodes as they occur • Akamai Edge Servers also log downloads from peers

  9. Statistics from December 2010 Logs

  10. Locations of Clients per EdgeScape Granularity of predictions varies by continent.

  11. December Client Logins What happened December 8?

  12. IP Addresses per GUID in December Category 3 (flagged) look like multiple installations with the same GUID.

  13. Clients Leave P2P Setting Unchanged Content provider decides on initial setting.

  14. File Size Distribution For customers other than J and F, median file size was 872MB.

  15. P2P Efficiency for Largest Enabled Customers Matches or exceeds earlier predictions.

  16. Efficiency versus Number of Peers

  17. Success Rates, All Downloads Over 86% success rate in December 2010.

  18. Terminations and Failures Occur Early

  19. Performance Majority P2P downloads average several Mbps.

  20. Content Popularity Typical?

  21. NetSession Versions Observed in Field NetSession should excel at downloading itself.

  22. Ongoing Work • Designing mechanisms to protect the logging system against attacks • (Successfully attacked it ourselves.)

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