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Harnessing The Power of CDNs
The document discusses the concept of Content Delivery Networks (CDNs), highlighting the advantages of using Akamai, such as reduced latency and improved caching. It includes statistical data on CDNs' impact on web traffic and details on caching mechanisms, response headers, and architectural considerations for deployment. Additional resources for further reading on web caching and CDN technology are also provided.
Harnessing The Power of CDNs
- 1. Harnessing the Powerof CDNs Gurpreet Luthra, Lead Consultant
- 2. Agenda • What isa CDN? • Brief on Akamai • Advantages of a CDN • Exploiting Caching • Statistics & Numbers • Architectural Considerations • Further References
- 3. About Me -Gurpreet Luthra • 13+ years, Developer & Lead Consultant • Working on Scala • Spent last few months harnessing Akamai • Twitter: _zenx_
- 4. What is aCDN? http://my-retail-store.com (GET)
- 5. What is aCDN? Hash Table Cache for all your HTTP Get Requests http://my-retail-store.com (GET)
- 6. What is aCDN? Ha Spread them all over the World! Ha Ha Ha Ha Ha Ha ORIGIN
- 7. CDN Distribution Scheme "NCDN- CDN" by Kanoha - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons http://commons.wikimedia.org/wiki/File:NCDN_-_CDN.png#/media/File:NCDN_-_CDN.png
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- 10. • 15-30% ofall Web Traffic • $1.96 Billion Annual Revenue • 5000+ employees • 170,000 Servers in 102 countries • 2 trillion daily Internet interactions http://www.akamai.com/html/about/facts_figures.html
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- 12. How do Iknow if a website is using Akamai? 12
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- 21. Recap — WhyCDN? • Caching: Reduced Page Construction Time • Closer: Reduced Latency • Traffic Offloaded: Reduced Loads • Backup: Served even if site is down • Protection: Prevent DoS Attacks • Others: Redirects/Auto-compression/Best-route detection
- 23. Types of Cacheson the Internet • Web browser • Proxy • CDNs • Reverse Proxies • Web Server’s / Specialized Caches
- 24. What would welove? • Cache Forever • Deploy immediately
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- 26. HTTP Response CacheHeaders • Expires • Cache-Control • Last-Modified • ETag
- 27. cache-control • max-age= (seconds) •s-maxage= • public • private • no-cache • must-revalidate • proxy-revalidate https://www.mnot.net/cache_docs/#CACHE-CONTROL
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- 30. Fingerprinting • Javascripts • CSS •Assets http://server.com/css/global-908e25f4bf641868d8683022a5b62f54.css
- 31. Fingerprinting HTML Pages Not fingerprinted 5- 30 mins JS/CSS/Assets Fingerprinted 1 year Images 30 days - 1 year
- 34. Cookie-less Domain • Whysubmit cookies for every GET request for assets? http://my-assets-host.com/css/ global-908e25f4bf641868d8683022a5b62f54.css
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- 36. Impact on oneWebsite • 85% - 90% Traffic offloaded to Akamai • MONTH • Assets: 100 GB (3KB Cookie) • Assets: 16 Million requests • Traffic: 47 TB (Akamai) • Traffic: 4 TB (Origin) • Peak: 742 Hits/sec (Akamai) • Peak: 47 Hits/sec (Origin)
- 37. Architectural Considerations • PageFragments • User Centric Data - Client Side - AJAX • Mobile/Non-Mobile Views in one payload
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- 39. Further References • Theminimum about Web caching you should know: https:// www.mnot.net/cache_docs • http://www.mobify.com/blog/beginners-guide-to-http-cache- headers/ • http://guides.rubyonrails.org/asset_pipeline.html • http://www.ietf.org/rfc/rfc2616.txt (Section 14.9) • http://ocw.mit.edu/courses/mathematics/18-996-topics-in- theoretical-computer-science-internet-research-problems- spring-2002/lecture-notes/ • http://www.akamai.com/dl/technical_publications/ GloballyDistributedContentDelivery.pdf • Image Credits: http://publicdomainvectors.org/
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