Elixir Replicated Caching with ConCache and Phoenix.PubSub

The article provides insights into developing a replicated caching solution within the Elixir programming environment using ConCache for caching and Phoenix.PubSub for message broadcasting across a cluster. Christoph Grothaus presents a use case involving caching of user permissions, which are costly to fetch and seldom change, making them ideal for caching. To avoid the complexity of full-fledged caching libraries, a simplified solution was devised. By extending ConCache with replication capabilities via Phoenix.PubSub, a cache replication across an Elixir cluster was achieved in merely 65 lines of code, striking a balance between simplicity and functionality. This approach assumes that each node in the cluster runs a similarly configured ConCache instance and leverages a PubSub system to handle message broadcasting.