This lab uses Alibaba Cloud Elastic MapReduce (E-MapReduce). It demonstrates how to play online videos stored in E-MapReduce through a Tomcat project. E-MapReduce is a big data processing system solution running on the Alibaba Cloud platform. E-MapReduce is built on Alibaba Cloud Elastic Compute Service (ECS) and is based on the open-source Apache Hadoop and Apache Spark frameworks.