Specifying Big Data Benchmarks First Workshop, WBDB 2012, San Jose, CA, USA, May 8-9, 2012, and Second Workshop, WBDB 2012, Pune, India, December 17-18, 2012, Revised Selected Papers - Rabl, Tilmann; Poess, Meikel; Baru, Chaitanya; Jacobsen, Hans-Arno (Springer Berlin Heidelberg : Imprint: Springer, 2014)