Unlock Backend Mastery with RocketMQ: Essential Design Insights from a 100k‑Word eBook

Hope is a good thing, maybe the best of things, and no good thing ever dies. 希望是件美丽的东西，也许是最好的东西，而美好的东西是永远不会消逝的。

Hello everyone, I am Yong Ge.

On Programmer's Day (Oct 2, 1024), I fulfilled a small dream.

After half a year of work I wrote an e‑book titled RocketMQ 4.X Design Essentials , which I would like to share today.

The book contains fifteen chapters, close to 100,000 words, 180 diagrams, and follows the RocketMQ knowledge system chapter by chapter.

Nginx + business logic layer + database + cache layer + message queue – this model can fit almost all business scenarios.

These words have guided my technical choices for years, leading me to focus on cache and message‑queue technologies.

In 2014 I first encountered RocketMQ while working at eLong Travel. I was eager to learn message‑queue concepts, but existing open‑source solutions did not satisfy me.

After reading “Taobao Technology Ten Years”, I discovered that MetaQ had been upgraded to version 3.0, though the source was not yet released.

When RocketMQ was open‑sourced in autumn 2014, I was thrilled and immediately explored its code.

I wanted to learn network programming, so I mimicked RocketMQ’s remoting module (built on Netty) and wrote a toy rpc implementation, which gave me a great sense of achievement despite my limited Netty knowledge.

Later, during an eLong technology innovation event, I attempted to rewrite Cobar’s communication module using Netty:

I referenced Cobar’s source code and spent two weeks building a Netty‑based proxy. Although rough and missing many features, the effort earned me an encouragement award.

This was the beautiful starting point of my RocketMQ journey.

Since then I have continuously applied RocketMQ in various business scenarios:

Live quiz: RocketMQ broadcast mode to push questions.

Reference Alibaba Cloud ONS to encapsulate a RocketMQ framework.

Implement a task scheduling system with RocketMQ communication framework.

Use RocketMQ as the foundation for an SMS platform.

Refactor the RocketMQ console to support multiple clusters.

Through RocketMQ I have learned many programming skills such as multithreading techniques, network programming, and file storage, and I now handle technical problems with greater confidence.

Cache, sharding, and message queues are the “three swords” of high‑concurrency solutions that every architect must master.

I wrote this e‑book to help backend engineers quickly grasp RocketMQ concepts and improve their technical awareness.

If friends can grow quickly through this book, I will be extremely happy.

Because my abilities are limited, the book may contain errors; I welcome feedback and thank you very much.

Search “勇哥java实战分享” on WeChat and reply “mq” to receive the PDF of RocketMQ 4.X Design Essentials .