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How is your lone web server going to handle all the traffic you'll get when it lands on Slashdot or the front page of Digg? Probably not well. To prepare for all of this popularity you're going to need multiple servers, but there's more to it than buying hardware.
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Burt Beckwith has been a software developer for 15 years, most of that as a JVM developer, and for the last five years working with Grails and Groovy. He is a core developer on the Grails team at SpringSource, and has created over 40 Grails plugins.