13 Mar '13, 10am

Behind the Scenes of Fresh Web Explorer

Behind the Scenes of Fresh Web Explorer

In each of the following sections, I’ll be talk about some of the hidden challenges to many of these seemingly-innocuous stages of the pipeline, as well as the particular ways in which we’ve tackled them. To kick this process off, we begin with the primordial soup out of which this crawl emerges: the our schedule of feeds to crawl. Scheduling Like you might expect on the web, a few domains are responsible for most of the feeds that we crawl. Domains like Feedburner and Blogspot come to mind, in particular. This becomes problematic in terms of balancing politeness with crawling in a reasonable timeframe. For some context, our goal is to crawl every feed in our index roughly every four hours, and yet some of these domains have hundreds of thousands of feeds. To make matters worse, this is a distributed crawl on several workers, and coordination between workers is severely de...

Full article: http://www.seomoz.org/blog/behind-the-scenes-of-fresh-web...

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