Archtiect - Tech Stacks WebServers, Caching, Messaging

Sprint framework https://www.cnblogs.com/Mattcoder/articles/7307956.html

Memcache, less reliable than Redis - no persistence, no backup

The Kafka cluster retains all published messages—whether or not they have been consumed—for a configurable period of time. For example if the log retention is set to two days, then for the two days after a message is published it is available for consumption, after which it will be discarded to free up space.