Okay, I am very sorry that I got Rick Houlihan's name wrong.
In my defense, I hadn't watched his talks _recently_ and we've all been Berenstain Bear'ed a few times.
But also the comparison of DynamoDB/Cassandra to MongoDB comes directly from his talks. He currently works at MongoDB. I understand MongoDB has more of a flowery API with some more "powerful" operators. It is still a database where you store denormalized information and therefore is inflexible to changes in access patterns.
In my defense, I hadn't watched his talks _recently_ and we've all been Berenstain Bear'ed a few times.
But also the comparison of DynamoDB/Cassandra to MongoDB comes directly from his talks. He currently works at MongoDB. I understand MongoDB has more of a flowery API with some more "powerful" operators. It is still a database where you store denormalized information and therefore is inflexible to changes in access patterns.