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Author: Hai Xiang source: RabbitMQ delay queue, message delay push - Haixiang - blog Park# Application scenario # At present, the common application software has the shadow of delayed message push, which is also widely used, such as: Taobao automatically confirms receipt within seven days. After we sign for the goods, the logistics system wi ...

The popular open source message middleware in the industry includes ActiveMQ, rabbitmq, RocketMQ, Kafka and ZeroMQ, among which rabbitmq, RocketMQ and Kafka are the most widely used. Redis can also be a mechanism similar to Queue and Pub/Sub to some extent, but it is not strictly a message oriented middleware. This article will talk about the b ...

Chapter 4 RocketMQ application 1, General message 1 message sending classification Producer also has a variety of options for sending messages. Different methods will produce different system effects. Send messages synchronously Sending a message synchronously means that after the Producer sends a message, it will send the next message aft ...

Idempotency concept The results of one request or multiple requests initiated by the user for the same operation are consistent, and there will be no side effects due to multiple clicks. The simplest example is payment. The user pays after purchasing goods, and the payment deduction is successful. However, when the result is returned, th ...

1. What is a blocking queue? The first is a queue. The second is blocking. In the producer consumer model, the producer produces while the consumer consumes, so imagine these two threads as two threads, one is plugging in and the other is taking out. When the production thread is full and the consumption thread is not taken out in time, ...

This paper is based on linux system to build rabbitmq cluster. By default, the installation is completed. If it is not installed, you can go to RabbitMQ simple installation See how to install. The following is the construction of single machine mode cluster Check whether it is running Make sure rabbitmq is running properly. ps aux|grep rabb ...

1. What is middleware What is middleware Since the 1980s, Chinese enterprises have gradually carried out information construction. Due to the immature methods and systems and the changing market demand of enterprise business, an enterprise may run multiple different business systems at the same time. These systems may be based on differe ...

Introduction to the official website Refer to the official website: https://www.rabbitmq.com/getstarted.html web interface operation 03-1. Simple mode Interface operation process: create a queue, enter the default switch, initiate a message to the specified queue, and finally enter the queue for message preview. During preview, you should ...

1, Planning 1. Server OSapplicationHostnameremarksCentOS 7.4(192.168.139.162)HA + Keepalivedha_1Cluster high availability (master)CentOS 7.4(192.168.139.160)HA + Keepalivedha_2Cluster high availability (backup)CentOS 7.4(192.168.139.158)Erlang 23.2.5,RabbitMQ 3.9.7mq_1mq_1 disk nodeCentOS 7.4(192.168.139.137)Erlang 23.2.5,RabbitMQ 3.9.7mq ...

Problem Description: One or more Producers place data in a buffer after productionA single consumer fetches data from the buffer for processingOnly one producer or consumer can access the buffer at any time Using semaphores to solve the producer consumer problem Problem analysis: Only one thread can operate the buffer at any time (mut ...