ElastiCache Serverless has introduced a significant feature by enabling Memcached replication, which has often been overlooked amidst discussions of its serverless nature. While Memcached is known for its exceptional performance and scalability as a hyper-optimized key-value store, it traditionally lacked replication capabilities, unlike Redis, which offers a broader set of features including multi-AZ replication. The new serverless version of ElastiCache has added automatic data replication across multiple availability zones for Memcached, enhancing its appeal for simple key-value use cases by allowing greater throughput without sacrificing performance or availability. This development positions Memcached as a more competitive option against Redis for users who prioritize replication and throughput. Meanwhile, Momento leverages Pelikan, Twitter’s Rust-based reimplementation of Memcached, to support replication through a proxy layer, facilitating seamless scaling and data recovery after node failures without extensive configuration.