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1, Overview The message consumption of RocketMQ includes two modes: push and pull. The pull mode is officially not recommended, so we mainly introduce the push mode. Special note: the source code of this paper is based on RocketMQ4.8. 2, Push mode startup process 1. consumer code snippet package com.example.demo.rocketmq; import org.apache ...

1, Simple mode 1. Simple mode The first mock exam is a one to one mode, one producer, one consumer, and the producer sends messages to consumers. Producer: the program that sends the message Consumer: the receiver of the message, who will always wait for the message to arrive Message queue: similar to a mailbox, it can cache message ...

1. Causes of message loss 1. When the sender sends a message, the message is lost. It seems that the message has been sent 2.mq has received the message, but the consumer did not receive it when consuming Ensure reliable arrival at p - > b, e - > Q and Q - > C; (picture from Shangri Valley) 2. Callback function and configuration on ...