TF-IDF in Hadoop MapReduce使用的好文章

http://marcellodesales.wordpress.com/2009/12/31/tf-idf-in-hadoop-part-1-word-frequency-in-doc/

http://marcellodesales.wordpress.com/2010/01/06/tf-idf-in-hadoop-part-2-word-counts-for-docs/

http://marcellodesales.wordpress.com/2010/01/10/tf-idf-in-hadoop-part-3-documents-in-corpus-and-tfidf-computation/

TF-IDF algorithm的MapReduce实现，使用hadoop-0.20.1