Blog post

Amazon CloudFront gets whole site delivery and acceleration

By Lydia Leong | May 14, 2012 | 0 Comments


For months, there have been an abundance of rumors that Amazon was intending to enter the dynamic site acceleration market; it was the logical next step for its CloudFront CDN. Today, Amazon released a set of features oriented towards dynamic content, described in blog posts from Amazon’s Jeff Barr and Werner Vogels.

When CloudFront introduced custom origins (as opposed to the original CloudFront, which required you to use S3 as the origin), and dropped minimum TTLs down to zero, it effectively edged into the “whole site delivery” feature set that’s become mainstream for the major CDNs.

With this latest release, whole site delivery is much more of a reality — you can have multiple origins so you can mix static and dynamic content (which are often served from different hostnames, i.e., you might have serving your static content, but serving your dynamic content), and you’ve got pattern-matching rules that let you define what the cache behavior should be for content whose URL matches a particular pattern.

The “whole site delivery” feature set is important, because it hugely simplifies CDN configuration. Rather than having to go through your site and change its URL references to the CDN (long-time CDN watchers may remember that Akamai in the early days would have customers “Akamaize” their site using a tool that did these URL rewrites), the CDN is smart — it just goes to the origin and pulls things, and it can do so dynamically (so, for instance, you don’t have to explicitly publish to the CDN when you add a new page, image, etc. to your website). It gets you closer to simply being able to repoint the URL of your website to the CDN and having magic happen.

The dynamic site acceleration features — the actual network optimization features — that are being introduced are much more limited. They basically amount to TCP connection multiplexing, TCP connection peristency/pooling, and TCP window size optimization, much like Cotendo in its very first version. At this current stage, it’s not going to be seriously competing against Akamai’s DSA offering (or CDNetworks’s similar DWA offering), but it might have appeal against EdgeCast’s ADN offering.

However, I would expect that like everything else that Amazon releases, there will be frequent updates that introduce new features. The acceleration techniques are well known at this point, and Amazon would presumably logically add bidirectional (symmetric POP-to-POP) acceleration as the next big feature, in addition to implementing the common other optimizations (dynamic congestion control, TCP “FastRamp”, etc.).

What’s important here: CloudFront dynamic acceleration costs the same as static delivery. For US delivery, that starts at about $0.12/GB and goes down to below $0.02/GB for high volumes. That’s easily somewhere between one-half and one-tenth of the going rate for dynamic delivery. The delta is even greater if you look at a dynamic product like Akamai WAA (or its next generation, Terra Alta), where enterprise applications that might do all of a TB of delivery a month typically cost $6000 per app per month — whereas a TB of CloudFront delivery is $120. Akamai is pushing the envelope forward in feature development, and arguably those price points are so divergent that you’re talking about different markets, but low price points also expand a market to where lots of people can decide to do things, because it’s a totally different level of decision — to an enterprise, at that kind of price point, it might as well be free.

Give CloudFront another year of development, and there’s a high probability that it can become a seriously disruptive force in the dynamic acceleration market. The price points change the game, making it much more likely that companies, especially SaaS providers (many of whom use EC2, and AWS in general), who have been previously reluctant to adopt dynamic acceleration due to the cost, will simply get it as an easy add-on.

There is, by the way, a tremendous market opportunity out there for a company that delivers value-added services on top of CloudFront — which is to say, the professional services to help customers integrate with it, the ongoing expert technical support on a day to day basis, and a great user portal that provides industry-competitive reporting and analytics. CloudFront has reached the point where enterprises, large mainstream media companies, and other users of Akamai, Limelight, and Level 3 who feel they need ongoing support of complex implementations and a great toolset that helps them intelligently operate those CDN implementations, are genuinely interested in taking a serious look at CloudFront as an alternative, but there’s no company that I know of that provides the services and software that would bridge the gap between CloudFront and a traditional CDN implementation.

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