(Hadoop is one of the most important frameworks in big data technology and the first necessary lesson for learning big data. On the Hadoop platform, it is easier to develop and run other frameworks for processing large-scale data. The Hadoop video tutorial in Silicon Valley has been upgraded again! Based on the actual production environment of the enterprise, a more comprehensive, detailed and hard core production tuning manual has been added. The source code analysis part has been newly expanded and upgraded, and a large number of enterprise actual combat cases have been added!)