“LSM trees are the underlying data structure used for [..] DynamoDB, and they have proven to perform really well at scale [..] 80 million requests per second!”

This is a tad bit misleading, as the LSM is used for the node-level storage engine, but doesn’t explain how the overall distributed system scales to 80 million rps.

iirc the original Dynamo paper used BerkeleyDB (b-tree or LSM), but the 2012 paper shifted to a fully LSM-based engine.