果 的大数据问题

 

How do you take millions of users with 100's of

   transactions each, amongst 10k's of products and group the users together in a meaningful segments? 

http://www.glassdoor.com/Interview/How-do-you-take-millions-of-users-with-100-s-of-transactions-each-amongst-10k-s-of-products-and-group-the-users-together-i-QTN_548791.htm

没什么借鉴