There is also a series of posts regarding the design of Aurora on the AWS blog, although about everything is described in the original paper:

https://aws.amazon.com/blogs/database/amazon-aurora-under-th...

https://aws.amazon.com/blogs/database/amazon-aurora-under-th...

https://aws.amazon.com/blogs/database/amazon-aurora-under-th...

https://aws.amazon.com/blogs/database/amazon-aurora-under-th...