Description

EMR, Elastic MapReduce, is a managed cluster platform that simplifies running big data frameworks. EMR cluster is a collection of Amazon Elastic Compute Cloud (Amazon EC2) instances. Each instance in the cluster is called a node. The master node manages the cluster and coordinates the distribution of data and tasks among other nodes for processing. Master node {AwsEmrInstance} has an associated public IP address. Although it allows to create a secure access using SSH tunnel, associating the master node with public IP address directly and not within a VPC or a private subnet that has IPv4 does not stand with security best practices.