(Hadoop is one of the most important frameworks in big data technology, and it is the first lesson necessary for learning big data. On the Hadoop platform, it is easier to develop and run other frameworks that process large-scale data. The Silicon Valley Hadoop video tutorial 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 actual enterprise cases have been added!)