Building a Distributed PubSub System in Elixir

In this article, the author discusses creating a distributed PubSub in Elixir, beginning with a local PubSub that allows message broadcasting to local subscribers. The article explains the PubSub pattern and its application using a radio station analogy. It then guides the reader through building a basic local PubSub using Elixir's Registry module for process storage. The author illustrates the setup with code snippets, showcasing how to register and dispatch messages among processes. Moving towards a distributed implementation, the article introduces Erlang's process groups and the importance of connecting and managing multiple nodes in a cluster. Finally, the reader is encouraged to utilize the battle-tested Phoenix.PubSub for production systems but provides a simple example for learning purposes.