My understanding of MemoryDB is that it basically replaces the AOF with a distributed log (it might be Kafka/kinesis, but it could just be backed by the same da

My understanding of MemoryDB is that it basically replaces the AOF with a distributed log (it might be Kafka/kinesis, but it could just be backed by the same data layer as aurora). The biggest win there is that acknowledged writes are not lost if the writer node dies. A reader can replay the log and get fully caught up as it is promoted during a failover. This comes at a cost though and writes are slower than traditional redis.