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Hello,
- EMR serverless creates private ENI for each worker which will consume an IP address on the private subnet where it is launched by design. So, it is recommended only to private subnet in EMR serverless world. Refer here for more.
- Without VPC connectivity, a job can access some AWS service endpoints in the same AWS Region. These services include Amazon S3, AWS Glue, Amazon CloudWatch Logs, AWS KMS, AWS Security Token Service, Amazon DynamoDB, and AWS Secrets Manager. You can enable VPC connectivity to access other AWS services through AWS PrivateLink, but you aren't required to do this. To access external services, you can create your application with a VPC. Refer here
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Thanks, and if I go with vpc and use s3 endpoint to interact, will there be any performance implications like the traffic hops might be not optimized ?
No performance impact. Basically the traffics of VPC endpoints goes within AWS networks which is indeed secure and do not bring latency in traffic.