Hadoop running in production on the Yahoo! Search Webmap

Some big news in the world of Hadoop comes out of Yahoo! today. We believe we're now running the world's largest Hadoop application, a 10,000 core Linux cluster producing data used by the Yahoo! Search Webmap.

As you can see from the announcement on the Hadoop Blog:

The Webmap build starts with every Web page crawled by Yahoo! and produces a database of all known Web pages and sites on the internet and a vast array of data about every page and site. This derived data feeds the Machine Learned Ranking algorithms at the heart of Yahoo! Search.

Some Webmap size data:

  • Number of links between pages in the index: roughly 1 trillion links
  • Size of output: over 300 TB, compressed!
  • Number of cores used to run a single Map-Reduce job: over 10,000
  • Raw disk used in the production cluster: over 5 Petabytes

In this video, YDN's Jeremy Zawodny interviews Arnab Bhattacharjee (manager of the Yahoo! Webmap Team) and Sameer Paranjpye (manager of our Hadoop development) to learn more about what all this means:

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I'm sure there will be more to come on the Hadoop front, so watch this space.

Matt McAlister