Challenges and Solutions of EMQX Horizontal Scalability: MQTT Broker Clustering, Part 3

This post will introduce some of the improvements of the MQTT broker cluster scalability. We will mostly focus on the database engine that EMQX uses internally and how we improved it in EMQX 5.0.

Before we start, you should know how data is replicated in the EMQX cluster: EMQX Broker stores the runtime information about the topics and clients in the Mnesia database, which helps replicate this data across the cluster.

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