AWS Database Blog
Author: Mohit Agarwal
Megabytes in milliseconds: How Fire TV uses parallel queries and vertical partitioning to serve millions of customers in Amazon DynamoDB
How Amazon Fire TV redesigned its Continue Watching watch-progress data model on Amazon DynamoDB with vertical partitioning and hash-prefixed sort keys for parallel reads, removing item-size limits, cutting write costs by 97%, and keeping reads under 50 milliseconds at any profile size.