There are a bunch of stuff that can use some attention to improve HDFS At Rest Encryption (aka Data Transparent Encryption).
Here's a spreadsheet of features, bug fixes, improvements https://docs.google.com/spreadsheets/d/13oeUy0Mvmq6Ngvw9IjkY9KXiQyoRIcRlijKXG1YqGug/edit?usp=sharing I am planning to spend the next few months to focus on KMS. If you are looking for some thing to contribute, or if you care about data encryption, or you have a EZ/KMS patch pending review, now's a good time. Best, Weichiu
