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

2. Powering a Better Internet © 2011 Akamai Akamai Network Deployment 85800+ Servers 1000+ Networks 79+ Countries 1795+ POPs

3. Powering a Better Internet © 2011 Akamai 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. Powering a Better Internet © 2011 Akamai 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. Powering a Better Internet © 2011 Akamai 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. Powering a Better Internet © 2011 Akamai Growth in Number of Installations Full product roll-out expected summer 2011.

7. Powering a Better Internet © 2011 Akamai Architecture BitTorrent-like protocol with control nodes serving as “trackers” and assigning peers CDN acts as a backstop Akamai Control Nodes Akamai Edge Servers Peers

8. Powering a Better Internet © 2011 Akamai 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. Powering a Better Internet © 2011 Akamai Statistics from December 2010 Logs

10. Powering a Better Internet © 2011 Akamai Locations of Clients per EdgeScape Granularity of predictions varies by continent.

11. Powering a Better Internet © 2011 Akamai December Client Logins What happened December 8?

12. Powering a Better Internet © 2011 Akamai IP Addresses per GUID in December Category 3 (flagged) look like multiple installations with the same GUID.

13. Powering a Better Internet © 2011 Akamai Clients Leave P2P Setting Unchanged Content provider decides on initial setting.

14. Powering a Better Internet © 2011 Akamai File Size Distribution For customers other than J and F, median file size was 872MB.

15. Powering a Better Internet © 2011 Akamai P2P Efficiency for Largest Enabled Customers Matches or exceeds earlier predictions.

16. Powering a Better Internet © 2011 Akamai Efficiency versus Number of Peers

17. Powering a Better Internet © 2011 Akamai Success Rates, All Downloads Over 86% success rate in December 2010.

18. Powering a Better Internet © 2011 Akamai Terminations and Failures Occur Early

19. Powering a Better Internet © 2011 Akamai Performance Majority P2P downloads average several Mbps.

20. Powering a Better Internet © 2011 Akamai Content Popularity Typical?

21. Powering a Better Internet © 2011 Akamai NetSession Versions Observed in Field NetSession should excel at downloading itself.

22. Powering a Better Internet © 2011 Akamai Ongoing Work Designing mechanisms to protect the logging system against attacks (Successfully attacked it ourselves.)