Updating Tomcat in an EMR cluster

February 8, 2020February 12, 2020 ~ afish ~ Leave a comment

This is a short story of fixing Tomcat in an EMR cluster. There is a CVE about Tomcat 8 hole. I’m using EMR 5.12.2. Let’s try installing CVE patch as a bootstrap action with It should fix the mentioned hole but after bringing up the new cluster and running we can see that it installs … Continue reading Updating Tomcat in an EMR cluster

Investigating AWS SDK conflicts in EMR

August 25, 2018July 11, 2018 ~ afish ~ Leave a comment

When you deploy your package to Amazon Elastic Map Reduce (EMR), you can access the AWS SDK provided by the platform. This gets tricky if you compile your code against different version of SDK because then you may get very cryptic bugs in runtime, like class not found or method not existing. You should always … Continue reading Investigating AWS SDK conflicts in EMR