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Rocketmq distributed transaction processing details I Related concepts Based on its message definition, RocketMQ extends two related concepts to transaction messages: 1. Half(Prepare) Message -- half message (preprocessed message) Semi message is a special message type. Messages in this state cannot be consumed by consumers temporarily. When ...

Introduction: This is a learning note blog about the installation and deployment of flume. The main contents include: flume installation and deployment and two entry cases of flume. They are: the official case of monitoring port data and the file changes tracked by multiple files in the specified directory in real time. If there are mistakes, p ...

Feign declarative remote call 1. Introduction Feign is a declarative HTTP client. Its purpose is to make remote calls easier. Feign provides the template of HTTP request. By writing a simple interface and inserting annotations, you can define the parameters, format, address and other information of HTTP request. Feign integrates Ribbon (l ...

First meet Zookeeper Zookeeper is a sub project under the Apache Hadoop project. It is a tree directory service. The zoo keeper is used to manage Hadoop, Hive, Pig and other animals. Zookeeper is a distributed, open source, distributed application coordination service. The most commonly used functions: configuration management, distributed lo ...

1, Foreword In the last article Research on distributed transaction principle of Seata AT mode In this paper, we will use spring cloud and spring cloud Alibaba to integrate Seata to realize distributed transaction control, and use Nacos as the registration center to register Seata into Nacos. 2, Environmental preparation This article mainly ...

catalogue 1, Foreword 2, Demonstration 3, System design 4, UI development 1. Overall structure definition and sidebar 2. Dialog box 3. Friends bar 4. Event definition 5, Communication design 1. System architecture 2. Communication protocol 3. Add friends 4. Message response 5. Disconnection and reconnection 6. Trunking communica ...

In the project development, with the continuous development of business, the data increases day by day. At this time, the database and table splitting operation of the data table will appear. Once the database and table are divided. The traditional ID loses its meaning. Therefore, a distributed global ID is required. Characteristics of distrib ...

1. Distributed lock 1.1 what is distributed lock When we develop a stand-alone application involving concurrent synchronization, we often use synchronized or ReentrantLock to solve the problem of code synchronization between multiple threads. However, when our application works in a distributed cluster, we need a more advanced locking mechani ...

Synchronized I. Use Modifier class: instance method, static method, code block; Instance method: Lock object is the current instance object: public synchronized void sayHello(){ System.out.println("Hello World"); } Static method: Lock object is the current class Class object: public static synchronized void sayHello(){ System.out.print ...

background Timing tasks need to be handled in the project, and our applications will be published and run on multiple servers. In order to avoid concurrent processing leading to dirty data, we usually introduce distributed scheduling systems such as Elastic-Job or xxl-Job to process. But this requires a new system to be built, and if it's just ...