In this chapter, we learned some of the advanced configurations such as various different types of bootstrap actions you can add to your cluster. We also learned ways to connect to the master node and view the various web interfaces published by Hadoop. Further, we learned how to install Ganglia and access its web view in order to monitor our cluster's performance in detail.
Till now, we have used the AWS console to launch and manage an EMR cluster, but many of us like the CLI tools. In our next chapter, we will learn how to launch an EMR cluster, add steps to it, keep track of the status of each step, and finally, how to terminate the cluster, all from the command line.