1. The Apache Software Foundation,
https://flume.apache.org
2. The Apache Software Foundation,
https://sqoop.apache.org
3. Dataiku,
http://www.dataiku.com/blog/2013/05/01/a-complete-guide-to-writing-hive-udf.html
4. IBM,
http://www.ibm.com/developerworks/java/library/j-mahout/
5. IBM,
http://www.ibm.com/developerworks/library/j-mahout-scaling/