Download the book in PDF or EPUB.Just like Internet, Big Data is part of our lives today. From search, online shopping, video on demand, to e-dating, Big Data always plays an important role behind the scene. Some people claim that Internet of things (IoT) will take over big data as the most hyped technology @Gartner2014. It may become true. But IoT cannot come alive without big data. In this book, we will dive deeply into big data technologies. But we need to understand what is Big Data first.