Overview of the Hadoop Ecosystem Back to: The Ultimate Hands-On Hadoop: Tame your Big Data! Previous Lesson Hadoop Overview and History Lesson 3 within section Learn all the buzzwords! And install the Hortonworks Data Platform Sandbox.. You must enroll in this course to access course content. Next Lesson HDFS: What it is, and how it works Lesson 1 within section Using Hadoop's Core: HDFS and MapReduce. You must enroll in this course to access course content.