The Internet has become the orchestrating background for a new crop of smart services constantly feeding on raw data to improve user experience and results quality. Data defined by two fundamental qualities that make them hard to handle with traditional methods: unstructured and with exponential growth. Cloud Computing, natural evolution of virtualization and modern solution to heterogeneous distribution of service demand, together with a modern MapReduce implementation, constitute the cutting-edge in Big Data technologies. This book will get you acquainted with both paradigms to later introduce 'qosh': A Private Cloud Implementation for MapReduce Applications.