Amazon EMR Serverless adds support for Public Subnets

[Amazon EMR Serverless](https://aws.amazon.com/emr/serverless/) is a serverless option in Amazon EMR that makes it simple for data engineers and data scientists to run open-source big data analytics frameworks without configuring, managing, and scaling clusters or servers. Today, we are excited to announce support for Public Subnets that allow you to use EMR Serverless for cost effective outbound data transfer from the cloud for big data processing workloads. EMR Serverless applications allow you to enable VPC connectivity for use cases that need to connect to VPC resources or for outbound data transfer from the cloud to access resources on the Internet or other cloud providers. Previously, VPC connectivity supported only Private Subnets, hence you needed to configure a NAT (network address translation) Gateway for outbound connectivity from the cloud, which adds additional charges based on the amount of data transferred. Now, you can configure VPC connectivity for EMR Serverless applications on Public Subnets, which have a direct route to an internet gateway. This allows you to eliminate the NAT Gateway charges and use EMR Serverless for cost-effective outbound data transfer from the cloud for big data processing workloads. Amazon EMR Serverless Public Subnet support is available in all supported EMR releases and in all AWS Regions where EMR Serverless is available, including the AWS GovCloud (US) Regions. To learn more, visit [Configuring VPC Access](https://docs.aws.amazon.com/emr/latest/EMR-Serverless-UserGuide/vpc-access.html) in the EMR Serverless documentation.