Amazon EMR on EC2 now provides contextual error details that makes it easier to troubleshoot cluster provisioning failures. EMR lets you provision your EMR on EC2 cluster without worrying about managing compute infrastructure or open-source application setup. However, there can be circumstances when your cluster provisioning fails, such as an insufficient EC2 instance capacity error, bootstrap action failure or a VPC-subnet misconfiguration error. With today’s launch, you will now find additional error details in the new EMR console, AWS Command Line Interface (AWS CLI), and the AWS SDK. These additional error details are automatically enabled for all EMR versions and no further action is needed.
Source:: Amazon AWS