When you deploy an emr cluster in your ryo private vpc, check…
In EMR, the ability for machines to find and talk to each other is provided by the DNS resolution and the DNS hostname VPC settings.
Failure to do this on your vpc
will result in lots of gnashing of teeth and lots of everything your mom told you she would wash your mouth out for - aka
At 20m a pop I was quickly approaching my 10,000 hour mastery of the