Monthly Archives: October 2010

Recommendation Engine Powered by Hadoop (Part 2)

Posted on October 31, 2010 by Pranab

In Part 1 of this post the focus was on finding the correlation between items, based on rating data available in individual items. The MR job output was the correlation coefficient matrix, with correlation coefficient  values between 0 and 1 … Continue reading →

Posted in Collaborative Filtering, Data Mining, Hadoop and Map Reduce, Java | Tagged , , | 10 Comments

Recommendation Engine Powered by Hadoop (Part 1)

Posted on October 19, 2010 by Pranab

Personalized recommendations are ubiquitous in social network and shopping sites these days. How do they do it? Al long as enough user interaction data is available for items e.g., products in shopping sites, a kind of recommendation engine based on … Continue reading →

Posted in Collaborative Filtering, Data Mining, Hadoop and Map Reduce | Tagged , , | 26 Comments

Cassandra secondary index to the rescue

Posted on October 2, 2010 by Pranab

In an earlier blog, I discussed Cassandra data model for a BPM system. I used an eCommerce order processing system driven by a BPM as an example. In this post, we will discuss some of the data access usage scenario … Continue reading →

Posted in Cassandra, Indexing, NOSQL | Tagged , , , | 1 Comment