Apache RocketMQ is an open source distributed messaging middleware system, originally developed by Alibaba Group and open sourced in 2012. It focuses on high throughput, low latency and reliability and is suitable for message communication in large-scale distributed systems.
Design principles and features:
Distributed architecture : RocketMQ adopts a distributed architecture to support horizontal expansion and high availability. Its architecture includes multiple Brokers, multiple Namesrv and multiple message queues.
Message ordering : RocketMQ can guarantee the strict ordering of messages. Through the partitioning mechanism, messages of the same business are sent to the same queue to ensure that consumers process messages in order.
High throughput and low latency : RocketMQ is optimized for high throughput and low latency messaging. It uses zero-copy technology and batch messaging to improve performance.
Reliability : RocketMQ provides a reliable messaging mechanism. It supports message persistence, ensuring that messages will not be lost even in the event of Broker failure or network abnormality.
Scalability : RocketMQ has good scalability. By adding Broker and Namesrv nodes, the system's processing capabilities can be linearly expanded.
Usage scenarios:
RocketMQ is suitable for many different usage scenarios, including but not limited to the following aspects:
Asynchronous messaging : RocketMQ can be used as an infrastructure for asynchronous messaging to decouple and improve the response performance of the system. The sender sends messages to the message queue, and the receiver can consume messages from the queue asynchronously.
Large-scale data processing : RocketMQ supports high-throughput messaging and is suitable for large-scale data processing and real-time computing scenarios. It is capable of handling large message flows and provides reliable message delivery guarantees.
Log collection and analysis : RocketMQ can collect logs generated by distributed systems and send them to the corresponding message queue. These logs can be used for subsequent monitoring, analysis and troubleshooting.
Event-driven architecture : RocketMQ can be used as the infrastructure of an event-driven architecture to process events and messages in the system. Through the publish and subscribe mechanism, individual modules can communicate in a loosely coupled manner.
Distributed transactions : RocketMQ supports distributed transaction messages, which can ensure transaction consistency in distributed systems. It achieves the reliability of distributed transactions through semi-message and two-phase commit protocols.
The above is only a brief introduction to RocketMQ’s design principles, features and usage scenarios. RocketMQ has more functions and features, including message filtering, scheduled messages, etc.