Write in front
In the distributed system architecture, there are the foreground system, the order system, and the member system . These three systems are deployed independently. If one system needs to be upgraded, the other systems do not need to be adjusted. Some requests can be completed by different systems. For example, when you want to view member points and order information at the same time on the same page, one request will involve multiple systems.
Such a system in which multiple systems work together to process a request is regarded as a distributed system. When a system is under high pressure, a single system can be expanded. At this time, RPC technology will be used to call remote interfaces to implement mutual calls between systems. However, the coupling degree of this method is relatively high. In order to achieve a stronger extensibility architecture, message middleware is introduced into the distributed system, and the system coupling is solved through message middleware.
This article comprehensively explains the core technologies of message middleware (message queue, kafka, rabbitmq, activemq, rocketmq)
The document is suitable for the crowd:
- Don’t understand distributed architecture and have no project experience
- Have no contact with message middleware, and don’t know much about its principle and usage
Catalog Outline of "Message Middleware PDF"
How to design a message queue?
There are at least three roles in the design of a complete usage scenario for a message queue .
- Message processing center: Responsible for message reception, storage, and forwarding.
- Message producer: responsible for generating and sending messages to the message processing center.
- Message consumers: Responsible for obtaining messages from the message processing center and processing them accordingly.
RabbitMQ
RabbitMQ is an open source implementation based on the AMQP standard developed by Erlang language. It is used to store and forward messages in a distributed system. It performs well in terms of ease of use, scalability, and high availability.
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AcitveMQ
ActiveMQ is an open source messaging middleware produced by Apache, which aims to provide applications with efficient, scalable, stable and secure enterprise-level messaging. Its design goal is to provide standard, message-oriented, multilingual application integration message communication middleware. Core application:
kafka
Kafka was originally a distributed publish/subscribe messaging system developed by LinkedIn , and later became a top-level project of Apache.
Kafka learning roadmap
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RocketMQ
Shown is the deployment structure diagram of RocketMQ, which involves the four core components of RocketMQ: NameServer, Broker, Producer, and Consumer . Each component can be deployed in a cluster mode for horizontal expansion.
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