1. Apache hadoop [online]. http://lucene.apache.org/hadoop/ (2013)
2. Amazon ec2. http://aws.amazon.com/
3. Cubie truck. http://forum.cubietech.com/
4. A.S. foundation. terasort example. http://hadoop.apache.org/docs/current/api/org/apache/hadoop/examples/terasort/package-summary.html (2014)
5. raspberry pi. https://www.raspberrypi.org/