what is going on inside of Nutch 2?
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I eager to know (and have to know) about the nutch and its algorithms (because it relates to my project) that it uses to fetch,classify,...(generally Crawling).  
I read [this][1] material but its a little hard to understand.  
Is there anyone who can explain this to me in a complete and easy-to-understand way?  
thanks in advance.


  [1]: http://wiki.apache.org/nutch/Nutch2Crawling