Those of you who listened to Yahoo!’s fourth quarter earnings call may remember Sue Decker mentioning our embrace of open source infrastructure. On a very related note, we’re announcing today that we implemented what we believe is the world’s largest commercial application of Apache Hadoop.

We are now using Hadoop to process the Webmap — the application which produces the index from the billions of pages crawled by Yahoo! Search. Matt McAlister posted today about the Hadoop implementation, including some numbers that will give you a feel for the scale of this implementation.

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