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Wednesday, December 15, 2004

Coral: The NYU Distribution Network

Some how I have neglected to blog this. Chris this is the site I was talking about.
Basically a distributed cache of web pages, spread over multiple zones. This service is of course uber-beta but useful nonetheless. There is a mozilla firefox plugin available to easily "Coralize" URL's to add the trailing ".nyud.net:8090" or you could just be lazy and do it manually. Notes done...sleep now
http://www.scs.cs.nyu.edu/coral/

More info here:
OverviewThe availability of content on the Internet is to a large degree a function of the cost shouldered by the publisher. A well-funded web site can reach huge numbers of people through some combination of load-balanced servers, fast network connections, and commercial content distribution networks (CDNs). Publishers who cannot afford such amenities are limited in the size of audience and type of content they can serve. Moreover, their sites risk sudden overload following publicity, a phenomenon nicknamed the ``Slashdot'' effect, after a popular web site that periodically links to under-provisioned servers, driving unsustainable levels of traffic to them. Thus, even struggling content providers are often forced to expend significant resources on content distribution.
Fortunately, at least with static content, there is an easy way for popular data to reach many more people than publishers can afford to serve themselves---volunteers can mirror the data on their own servers and networks. Indeed, the Internet has a long history of organizations with good network connectivity mirroring data they consider to be of value. More recently, peer-to-peer file sharing has demonstrated the willingness of even individual broadband users to dedicate upstream bandwidth to redistribute content the users themselves enjoy. Additionally, organizations that mirror popular content reduce their downstream bandwidth utilization and improve the latency for local users accessing the mirror.
What Coral offersCoralCDN is a decentralized, self-organizing, peer-to-peer web-content distribution network. CoralCDN leverages the aggregate bandwidth of volunteers running the software to absorb and dissipate most of the traffic for web sites using the system. In so doing, CoralCDN replicates content in proportion to the content's popularity, regardless of the publisher's resources---in effect democratizing content publication.
To use CoralCDN, a content publisher---or someone posting a link to a high-traffic portal---simply appends .nyud.net:8090 to the hostname in a URL. Through DNS redirection, oblivious clients with unmodified web browsers are transparently redirected to nearby Coral web caches. These caches cooperate to transfer data from nearby peers whenever possible, minimizing both the load on the origin web server and the end-to-end latency experienced by browsers.

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