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消息队列 分布式事务方案

消息队列 汪明鑫 15浏览 0评论

Spring Boot + ActiveMQ + Mybatis + mysql

基于MQ + 事件表 实现分布式事务解决方案

什么是分布式事务就不啰嗦了,我了解的也不多

就是rpc调用导致的事务问题,区别于本地事务

 

比如:

用户注册后,即送皮肤

用户注册是操作在DB1,送皮肤是操作在DB2

不是简单的本地事务

分布式事务保证操作DB1、 DB2都成功

 

我们引入事件表 + MQ 解决分布式事务

什么是事件表,就是记录用户注册/送皮肤这个事件的状态

用户注册成功后,也要向user_evernt表插入一个对应的事件数据,并置当前状态为NEW

然后定时任务1 ,user_evernt扫表,取出NEW的数据进行送皮肤操作,

把送皮肤的消息发送到MQ,发送后把user_evernt状态置为PUBLISHED

处理送皮肤的服务接收到消息后,向reward_evernt表插入一条数据,并把状态置为PUBLISHED

然后定时任务2,reward_evernt扫表,取出PUBLISHED的数据进行操作,并把状态置为DONE

 

 

建表sql

create  database userdb;
use userdb;

CREATE TABLE `user` (
  `id` bigint(20) unsigned primary key auto_increment COMMENT '自增长,主键',
  `user_name` varchar(100) DEFAULT NULL COMMENT '用户名'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `event` (
  `id` bigint(20) unsigned primary key auto_increment COMMENT '自增长,主键',
  `type` varchar(30) DEFAULT NULL COMMENT '事件类型',
  `process` varchar(30) DEFAULT NULL COMMENT '表示事件进行到了哪个环节',
  `content` text COMMENT '事件包含的内容',
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8
;
create  database rewarddb;
use rewarddb;

CREATE TABLE `reward` (
  `id` bigint(20) unsigned primary key auto_increment COMMENT '自增长,主键',
  `user_id` bigint(20) not null default 0,
  `skin` varchar(100) DEFAULT '龙瞎' COMMENT '皮肤'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `event` (
  `id` bigint(20) unsigned primary key auto_increment COMMENT '自增长,主键',
  `type` varchar(30) DEFAULT NULL COMMENT '事件类型',
  `process` varchar(30) DEFAULT NULL COMMENT '表示事件进行到了哪个环节',
  `content` text COMMENT '事件包含的内容',
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8
;

 

创建sprint boot项目:

 

项目整体结构:

 

maven依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>pers.wmx</groupId>
    <artifactId>activemq</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>activemq</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-activemq</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.60</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

 

application.properties

## 数据源配置
#spring.datasource.url=jdbc:mysql://localhost:3306/mydb?useUnicode=true&characterEncoding=utf8
#spring.datasource.username=root
#spring.datasource.password=1997
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver

# 配置第一个数据源
spring.datasource.hikari.db1.jdbc-url=jdbc:mysql://localhost:3306/userdb?useUnicode=true&characterEncoding=utf8&useSSL=true
spring.datasource.hikari.db1.username=root
spring.datasource.hikari.db1.password=1997
spring.datasource.hikari.db1.driver-class-name=com.mysql.cj.jdbc.Driver
# 配置第二个数据源
spring.datasource.hikari.db2.jdbc-url=jdbc:mysql://localhost:3306/rewarddb?useUnicode=true&characterEncoding=utf8&useSSL=true
spring.datasource.hikari.db2.username=root
spring.datasource.hikari.db2.password=1997
spring.datasource.hikari.db2.driver-class-name=com.mysql.cj.jdbc.Driver

## Mybatis 配置
#mybatis.typeAliasesPackage=pers.wmx.activemq
#mybatis.configuration.mapUnderscoreToCamelCase=true


spring.activemq.broker-url=tcp://ip:61616

#true 表示使用内置的MQ,false则连接服务器
spring.activemq.in-memory=false

 

数据源1配置类:

package pers.wmx.activemq.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Configuration
@MapperScan(basePackages = "pers.wmx.activemq.db1.dao", sqlSessionTemplateRef = "db1SqlSessionTemplate")
public class DataSource1Config {
    /**
     * 生成数据源.  @Primary 注解声明为默认数据源
     */
    @Bean(name = "db1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.hikari.db1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    /**
     * 创建 SqlSessionFactory
     */
    @Bean(name = "db1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //  bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/db1/*.xml"));
        return bean.getObject();
    }

    /**
     * 配置事务管理
     */
    @Bean(name = "db1TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

 

数据源2配置类:

package pers.wmx.activemq.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Configuration
@MapperScan(basePackages = "pers.wmx.activemq.db2.dao", sqlSessionTemplateRef = "db2SqlSessionTemplate")
public class DataSource2Config {
    @Bean(name = "db2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.hikari.db2")
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "db2SqlSessionFactory")
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/db2/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "db2TransactionManager")
    public DataSourceTransactionManager testTransactionManager(@Qualifier("db2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "db2SqlSessionTemplate")
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

 

实体类:

package pers.wmx.activemq.bean;

import lombok.Data;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Data
public class User {

    private Integer id;

    private String userName;

}

 

package pers.wmx.activemq.bean;

import lombok.Data;

@Data
public class Reward {

    private Integer id;

    private Integer userId;

    private String skin;

}

 

package pers.wmx.activemq.bean;

import lombok.Data;

import java.util.Date;

@Data
public class Event {

    private Integer id;

    private String type;

    private String process;

    private String content;

    private Date createTime;

    private Date updateTime;

}

 

常量类:

package pers.wmx.activemq.constant;

public enum EventProcess {

    NEW("NEW", "新建"),
    PUBLISHED("PUBLISHED", "已发布"),
    PROCESSED("PROCESSED", "已处理"),
    ;

    private String value;
    private String desc;

    EventProcess(String value, String desc) {
        this.value = value;
        this.desc = desc;
    }

    public String getValue() {
        return value;
    }

    public String getDesc() {
        return desc;
    }
}

 

package pers.wmx.activemq.constant;

public enum EventType {

    NEW_USER("NEW_USER", "新增用户"),
    NEW_REWARD("NEW_REWARD", "新增奖励"),
    ;

    private String value;
    private String desc;

    EventType(String value, String desc) {
        this.value = value;
        this.desc = desc;
    }

    public String getValue() {
        return value;
    }

    public String getDesc() {
        return desc;
    }
}

 

package pers.wmx.activemq.constant;

import java.util.ArrayList;
import java.util.List;

/**皮肤列表
 * @author wmx
 * @date 2019-09-26
 */
public class RewardConst {
    public static List<String> skinList = new ArrayList<>();

    static{
        skinList.add("猩红之月 压缩");
        skinList.add("泳池派对 德莱文");
        skinList.add("未来战士 伊泽瑞尔");
        skinList.add("死兆星 嘉文四世");
        skinList.add("蔷薇绅士 杰斯");
        skinList.add("死兆星 锤石");
    }

}

 

先看下dao层:

package pers.wmx.activemq.db1.dao;

import org.apache.ibatis.annotations.*;
import org.springframework.beans.factory.annotation.Qualifier;
import pers.wmx.activemq.bean.User;


/**
 * @author wmx
 * @date 2019-09-26
 */
@Mapper
@Qualifier("db1SqlSessionTemplate")
public interface UserDao {

    @Insert("insert into user(user_name) " +
            "values(#{user.userName})")
    @Options(useGeneratedKeys=true, keyProperty="user.id", keyColumn="id")   //插入成功后返回id
    int insert(@Param("user") User user);
}
package pers.wmx.activemq.db1.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.beans.factory.annotation.Qualifier;
import pers.wmx.activemq.bean.Event;

import java.util.List;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Qualifier("db1SqlSessionTemplate")
public interface UserEventDao {

    @Insert("insert into event(type, process, content)" +
            "values(#{type},#{process},#{content})")
    int newEvent(Event event);

    @Select({
            "<script>",
            "select id, type, process, content",
            "from event",
            "where process = 'NEW' ",
            "</script>"
    })
    List<Event> getNewEventList();

    @Update({
            "<script>",
            "update event",
            "set process = #{process}",
            "where id = #{id}",
            "</script>"
    })
    void updateProcess(Event event);
}

 

值得注意的地方我们配置的是双数据源,即2个db
@Qualifier("db1SqlSessionTemplate")

注入我们之前写的数据源配置类

 

package pers.wmx.activemq.db2.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;
import pers.wmx.activemq.bean.Reward;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Repository
@Qualifier("db1SqlSessionTemplate")
public interface RewardDao {
    @Insert("insert into reward(user_id,skin) " +
            "values(#{reward.userId},#{reward.skin})")
    @Options(useGeneratedKeys=true, keyProperty="id", keyColumn="id")   //插入成功后返回id
    void newReward(@Param("reward") Reward reward);
}
package pers.wmx.activemq.db2.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;
import pers.wmx.activemq.bean.Event;

import java.util.List;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Repository
@Qualifier("db1SqlSessionTemplate")
public interface RewardEventDao {

    @Insert("insert into event(type, process, content)" +
            "values(#{type},#{process},#{content})")
    int insert(Event event);

    @Select({
            "<script>",
            "select id, type, process, content",
            "from event",
            "where process = 'PUBLISHED' ",
            "</script>"
    })
    List<Event> getNewEventList();

    @Update({
            "<script>",
            "update event",
            "set process = #{process}",
            "where id = #{id}",
            "</script>"
    })
    void updateProcess(Event event);
}

 

再看下service层

package pers.wmx.activemq.service;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import pers.wmx.activemq.bean.Event;
import pers.wmx.activemq.bean.Reward;
import pers.wmx.activemq.bean.User;
import pers.wmx.activemq.constant.EventProcess;
import pers.wmx.activemq.constant.EventType;
import pers.wmx.activemq.constant.RewardConst;
import pers.wmx.activemq.db1.dao.UserDao;
import pers.wmx.activemq.db1.dao.UserEventDao;

import java.util.List;
import java.util.Random;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Service
public class UserService {

    @Autowired
    UserDao userDao;

    @Autowired
    UserEventDao userEventDao;

    @Autowired
    private JmsMessagingTemplate jmsMessagingTemplate;

    @Transactional
    public void newUser(String userName) {

        User user = new User();
        user.setUserName(userName);

        // 1.保存用户
        Integer row = userDao.insert(user);
        Integer userId = user.getId();

        // 2.新增事件
        Event event = new Event();
        event.setType(EventType.NEW_USER.getValue());
        event.setProcess(EventProcess.NEW.getValue());

        Reward reward = new Reward();
        reward.setUserId(userId);

        Random random = new Random();
        int index = random.nextInt(RewardConst.skinList.size());

        if(RewardConst.skinList != null && RewardConst.skinList.size()>0) {
            reward.setSkin(RewardConst.skinList.get(index));
        }

        // 将对象转成 json 字符串存到事件的内容字段中
        event.setContent(JSON.toJSONString(reward));
        userEventDao.newEvent(event);
    }

    public List<Event> getNewEventList() {
        List<Event> eventList = userEventDao.getNewEventList();
        return eventList;
    }

    public void executeEvent(Event event) {
        if (event != null) {
            String eventProcess = event.getProcess();
            if ((EventProcess.NEW.getValue().equals(eventProcess))
                    && (EventType.NEW_USER.getValue().equals(event.getType()))) {
                String messageContent = event.getContent();
                System.out.println("发送消息");
                jmsMessagingTemplate.convertAndSend("doReward",messageContent);

                event.setProcess(EventProcess.PUBLISHED.getValue());
                userEventDao.updateProcess(event);
            }
        }


    }

}
package pers.wmx.activemq.service;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import pers.wmx.activemq.bean.Event;
import pers.wmx.activemq.bean.Reward;
import pers.wmx.activemq.constant.EventProcess;
import pers.wmx.activemq.constant.EventType;
import pers.wmx.activemq.db2.dao.RewardDao;
import pers.wmx.activemq.db2.dao.RewardEventDao;

import java.util.List;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Service
public class RewardService {

    @Autowired
    RewardEventDao rewardEventDao;

    @Autowired
    RewardDao rewardDao;

    public void newEvent(Event event) {
        if(event != null){
            rewardEventDao.insert(event);
        }
    }


    public List<Event> getPublishedEventList() {
        List<Event> eventList = rewardEventDao.getNewEventList();
        return eventList;
    }

    public void executeEvent(Event event) {

        if (event != null) {
            String eventProcess = event.getProcess();
            if ((EventProcess.PUBLISHED.getValue().equals(eventProcess))
                    && (EventType.NEW_REWARD.getValue().equals(event.getType()))) {
                Reward reward = JSON.parseObject(event.getContent(), Reward.class);
                rewardDao.newReward(reward);

                event.setProcess(EventProcess.PROCESSED.getValue());
                rewardEventDao.updateProcess(event);
            }
        }

    }


}

 

定时任务部分:

注意定时任务的一个坑,需要在启动类加一个注解@EnableScheduling

否则定时任务不执行

package pers.wmx.activemq;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling
public class ActivemqApplication {

    public static void main(String[] args) {
        SpringApplication.run(ActivemqApplication.class, args);
    }

}

 

扫用户事件表定时任务:

package pers.wmx.activemq.task;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import pers.wmx.activemq.bean.Event;
import pers.wmx.activemq.service.UserService;

import java.util.List;

@Component
public class UserScheduled {

    @Autowired
    private UserService userService;

    //每3秒执行一次
    @Scheduled(fixedRate=3000)
    public void executeEvent() {
        
        System.out.println("执行定时任务 user ...");
        
        List<Event> eventList = userService.getNewEventList();
        if (!CollectionUtils.isEmpty(eventList)) {
            System.out.println("新建用户的事件记录总数:" + eventList.size());

            eventList.forEach(e->{
                userService.executeEvent(e);
            });
        } else {
            System.out.println("待处理的事件总数:0");
        }

    }
}

 

扫奖励事件表定时任务:

package pers.wmx.activemq.task;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import pers.wmx.activemq.bean.Event;
import pers.wmx.activemq.service.RewardService;

import java.util.List;

@Component
public class RewardScheduled {

    @Autowired
    private RewardService rewardService;

    @Scheduled(cron = "*/5 * * * * *")
    public void executeEvent() {

        System.out.println("执行定时任务 reward ...");

        List<Event> eventList = rewardService.getPublishedEventList();
        if (!CollectionUtils.isEmpty(eventList)) {
            System.out.println("已发布的奖励事件记录总数:" + eventList.size());

            eventList.forEach(e->rewardService.executeEvent(e));

        } else {
            System.out.println("待处理的事件总数:0");
        }

    }
}

 

cron表达式见 http://cron.qqe2.com/

 

消息消费者:

package pers.wmx.activemq.mq;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import pers.wmx.activemq.bean.Event;
import pers.wmx.activemq.constant.EventProcess;
import pers.wmx.activemq.constant.EventType;
import pers.wmx.activemq.service.RewardService;

/**
 * @author wmx
 * @date 2019-09-26
 */
@Component
public class RewardListener {

    @Autowired
    RewardService rewardService;

    @JmsListener(destination = "doReward")
    public void readMessage(String msg){
        System.out.println("msg = " + msg);

        if (!StringUtils.isEmpty(msg)) {
            // 新增事件
            Event event = new Event();
            event.setType(EventType.NEW_REWARD.getValue());
            event.setProcess(EventProcess.PUBLISHED.getValue());
            event.setContent(msg);
            rewardService.newEvent(event);
        }

    }

}

 

单元测试:

 @Test
    public void testNewUser(){
        userService.newUser("haha");
    }

 

执行单元测试

 

user 表

 

user对应的事件表

reward表

reward对应的事件表

 

现在,我们再重新看这个图,是不是就比较清晰了

1,先写用户表,再写事件表( NEW),事件表内容content就是 用户ID + 奖励皮肤

2,定时任务扫事件表,取出NEW状态下的数据,把content发送到activeMQ,并把状态置为PUBLISHED

3,消费者接收消息后,写事件表,content就是从activeMQ中读到的消息,即用户ID + 奖励皮肤,状态为PUBLISHED

4,定时任务扫奖励事件表,取出状态为PUBLISHED的数据,然后再reward表新加一条数据,再把事件表中对应的数据状态置为PROCESSED

整个过程完成

这样就保证了两个数据源之间数据的最终一致性了

 

今天涉及的内容包括SpringBoot,mybatis,mysql,activeMQ,定时任务,多数据源配置,事件表

还是很有收获的

有些小问题不注意就会调不通或者出错,比如定时任务不执行,多数据源不起作用等等

 

 

参考:

《分布式消息中间件实践》

http://bbs.itheima.com/thread-452900-1-1.html

https://blog.csdn.net/qq_34297563/article/details/90445684

转载请注明:汪明鑫的个人博客 » 消息队列 分布式事务方案

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