RocketMQ is a popular distributed messaging platform, and its storage layer is key to its high throughput and reliability. This article explains the core components: the commit log for sequential writes, consumer queues for fast consumption, and indexing for message lookup. It details how files are organized on disk, how flushing works, and how to tune for performance. The content is part of a series but stands alone as a reference for engineers working with RocketMQ in production. Understanding these internals helps in troubleshooting, capacity planning, and optimizing message delivery. The article is evergreen and commercially relevant for any organization using RocketMQ for event-driven architectures.
A deep dive into RocketMQ's storage internals, including commit log, consumer queues, and indexing.