seata 1.2 版本分布式事务的配置使用

柔光的暖阳◎ 2022-12-23 13:29 95阅读 0赞

本篇分析 seata 分布式事务的配置使用：

**首先seata程序 下载：** http://seata.io/en-us/blog/download.html   选择自己的版本下载，这里我们选择 1.2.0版本，seata-server-1.2.0.zip ，

源码下载（需要里面的sql脚本）：seata-develop.zip

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70][]

一、服务端配置：

1、配置seata的服务器端的数据库

全局事务会话信息由3块内容构成，全局事务 \--> 分支事务 \--> 全局锁，对应表 global\_table、 branch\_table、lock\_table。建立一个数据库名字ZIPKIN(可以随便取名)用来做seata服务端的库，存储全局事务的会话信息 。seata-develop.zip 解压导入idea，在 seata-develop\\script\\server\\db ，如下图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 1][]

目录拿到服务端数据库的脚本文件执行创建三张 global\_table 、 branch\_table、lock\_table 表 。

2、配置服务端启动数据库的文件：

seata-server-1.2.0.zip  程序解压，启动包: seata-->conf-->fifile.conf，fifile.conf文件的默认配置是 file 格式，为了方便开发观察我们修改store.mode="db"，然后修改自己的db连接信息，seata在启动的时候会去读取这个配置文件。如下：

## transaction log store, only used in seata-server
    store {
      ## store mode: file、db
      mode = "db"
    
      ## database store property
      db {
        ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
        datasource = "druid"
        ## mysql/oracle/postgresql/h2/oceanbase etc.
        dbType = "mysql"
        driverClassName = "com.mysql.jdbc.Driver"
        url = "jdbc:mysql://10.130.16.2466:305199/ZIPKIN"
        user = "mysql"
        password = "mysql"
        minConn = 5
        maxConn = 30
        globalTable = "global_table"
        branchTable = "branch_table"
        lockTable = "lock_table"
        queryLimit = 100
        maxWait = 5000
      }
    }

3、配置服务注册信息：

如果我们使用nacos做注册中心和配置中心，可以把这些信息放到nacos的配置中心，从而实现动态更新。这时你就需要修改seata-->conf-->registy.conf文件当中的注册中心和配置中心的信息，修改成为nacos；（为什么需要修改confifig和register呢？因为如果你的seata服务器想要去配置中心读取配置，那么首先要把自己注册到nacos；所以registy.conf当中需要配置注册中心的地址也需要配置配置中心的地址）这样我们后面启动seata就可以看到他是作为了一个nacos的客户端注册到了nacos里；核心配置如下:

registry {
      # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa   这里type 选 nacos类型
      type = "nacos"
    
      nacos {
        application = "seata-server"
        serverAddr = "http://172.21.2.72:8849" 
        namespace = ""   #注册到哪个命名空间，默认public
        cluster = "default"
        username = "nacos"
        password = "nacos"
      }
      
      consul {
        cluster = "default"
        serverAddr = "127.0.0.1:8500"
      }
     
      file {
        name = "file.conf"
      }
    }
    
    config {
      # file、nacos 、apollo、zk、consul、etcd3  这里type 选 nacos类型
      type = "nacos"
    
      nacos {
        serverAddr = "http://172.21.2.72:8849"
        namespace = "23d0f9d9-096e-4fea-a548-e3ba778a6b83"  #去哪个命名空间取配置信息
        group = "SEATA_GROUP"  #对应的组别
        username = "nacos"
        password = "nacos"
      }
      consul {
        serverAddr = "127.0.0.1:8500"
      }
      
      file {
        name = "file.conf"
      }
    }

此时seata已经可以作为客户端注册到nacos了：先启动nacos 在启动Seata :双击bat文件

![20201125193943145.png][]

启动成功页面：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 2][]

启动后访问nacos页面，看到seata 已经成功注册到 nacos 注册中心了。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 3][]

参考官网：[seata注册到nacos][seata_nacos]

4、把配置信息上传到nacos配置中心

到源码这个目录去信息：seata-develop\\script\\config-center   获取config.txt，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 4][]

然后把config.txt用idea编辑；保留自己想要的信息，我这里给出的是精简后的，你们需要自己对应修改自己的信息；主要是数据库配置信息，注意这些信息是服务器端和客户端都要使用的；由于上面我们已经把seata注册到了nacos；所以他的file.conf当中的信息可以直接从nacos读取（下面我们配置的信息）；换句话说如果你配置了seata作为nacos的一个客户端去读取配置，那么 file.conf可以不用配置了；因为这两步是重复的。换成大白话的意思就是你如果配置了registy.conf，那么file.conf当中的信息基本无效（都是从nacos配置中心读取）；甚至可以删了file.conf；如果你不配置registy.conf，那么seata就会从file.conf当中读取配置；所以file.conf和registy.conf其实只需要配置一个。这些问题大家可以亲测一下！

精简后的配置如下：

#事务分组——my_test_tx_group 这值会在我们客户端对应，需要注意
    service.vgroupMapping.my_test_tx_group=default
    service.default.grouplist=127.0.0.1:8091
    store.mode=db
    store.db.datasource=druid
    store.db.dbType=mysql
    store.db.driverClassName=com.mysql.jdbc.Driver
    store.db.url=jdbc:mysql://10.130.16.2466:305199/ZIPKIN?useUnicode=true
    store.db.user=mysql
    store.db.password=mysql
    store.db.minConn=5
    store.db.maxConn=30
    store.db.globalTable=global_table
    store.db.branchTable=branch_table
    store.db.queryLimit=100
    store.db.lockTable=lock_table
    store.db.maxWait=5000

那么这些精简后的配置如何传到 nacos 呢？  seata源码 seata-develop/script/config-center/nacos  目录 文件下面的 nacos-confifig.sh 文件然后执行 sh nacos-confifig.sh 命令 ；当然如果你的nacos地址不是默认的，需要修改naocsconfifig.sh当中指定你的nacos信息（也可以在 sh 命令后面指定）；同时这个目录 里面有个 readme 文件有说 明，可以看一下如何操作 。执行完成之后，你可以看到nacos的配置中心上面多了很多配置；注意这个时候 seata 服务器用的就是这 些配置了；你可以修改一个错误的试试是不能启动seata服务器的。nacos-confifig.sh文件在idea中修改如下：

#!/usr/bin/env bash
    # Copyright 1999-2019 Seata.io Group.
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at、
    #
    #      http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    
    while getopts ":h:p:g:t:u:w:" opt
    do
      case $opt in
      h)
        host=$OPTARG
        ;;
      p)
        port=$OPTARG
        ;;
      g)
        group=$OPTARG
        ;;
      t)
        tenant=$OPTARG
        ;;
      u)
        username=$OPTARG
        ;;
      w)
        password=$OPTARG
        ;;
      ?)
        echo " USAGE OPTION: $0 [-h host] [-p port] [-g group] [-t tenant] [-u username] [-w password] "
        exit 1
        ;;
      esac
    done
    
    if [[ -z ${host} ]]; then
        host=172.21.2.72
    fi
    if [[ -z ${port} ]]; then
        port=8849
    fi
    if [[ -z ${group} ]]; then
        group="SEATA_GROUP"
    fi
    if [[ -z ${tenant} ]]; then
        tenant="23d0f9d9-096e-4fea-a548-e3ba778a6b83"
    fi
    if [[ -z ${username} ]]; then
        username="nacos"
    fi
    if [[ -z ${password} ]]; then
        password="nacos"
    fi
    
    nacosAddr=$host:$port
    contentType="content-type:application/json;charset=UTF-8"
    
    echo "set nacosAddr=$nacosAddr"
    echo "set group=$group"
    
    failCount=0
    tempLog=$(mktemp -u)
    function addConfig() {
      curl -X POST -H "${contentType}" "http://$nacosAddr/nacos/v1/cs/configs?dataId=$1&group=$group&content=$2&tenant=$tenant&username=$username&password=$password" >"${tempLog}" 2>/dev/null
      if [[ -z $(cat "${tempLog}") ]]; then
        echo " Please check the cluster status. "
        exit 1
      fi
      if [[ $(cat "${tempLog}") =~ "true" ]]; then
        echo "Set $1=$2 successfully "
      else
        echo "Set $1=$2 failure "
        (( failCount++ ))
      fi
    }
    
    count=0
    for line in $(cat $(dirname "$PWD")/config.txt | sed s/[[:space:]]//g); do
      (( count++ ))
    	key=${line%%=*}
        value=${line#*=}
    	addConfig "${key}" "${value}"
    done
    
    echo "========================================================================="
    echo " Complete initialization parameters,  total-count:$count ,  failure-count:$failCount "
    echo "========================================================================="
    
    if [[ ${failCount} -eq 0 ]]; then
    	echo " Init nacos config finished, please start seata-server. "
    else
    	echo " init nacos config fail. "
    fi

修改的地方如图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 5][]

进入源码目录  /seata-develop/script/config-center/nacos   执行 sh nacos-config.sh 命令

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 6][]

结果显示；总共执行17个配置 成功16个  ，失败一个（首行是注释，所以会失败），此时nacos配置列表新增16个配置，均为seata相关配置信息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 7][]

此时重新启动seata服务：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 8][]

5、如果改seata 配置了，重启后会报错，比如修改：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 9][]

把数据库的用户名改一下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 10][]

改成：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 11][]

重启seata 会报错，证明配置中心生效：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 12][]

6、此时，seata服务端配置已经完成：即seata服务注册到nacos并把配置信息配置到nacos 配置中心。

参考官网： [seata配置到nacos相关][seata_nacos 1]

二、客户端配置：

1、创建两个springcloud 微服务项目，客户端数据库执行脚本：，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 13][]

在你的客户端操作的数据库当中建立undo\_log表，每个微服务的客户端均需要创建这张表；这个表用作用是来实现sql反向补偿也就是回滚的信息 。

2、客户端相关 seata 包引入：

<dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>io.seata</groupId>
                        <artifactId>seata-all</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>io.seata</groupId>
                        <artifactId>seata-spring-boot-starter</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>io.seata</groupId>
                <artifactId>seata-spring-boot-starter</artifactId>
                <version>1.2.0</version>
            </dependency>

3、yml配置文件信息参考目录  seata-develop\\script\\client\\spring  源码：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 14][]

bootstrap.yml 配置标准：

spring:
      profiles:
        active: dev
      application:
        name: power
      cloud:
        nacos:
          config:
            #自定义配置
            server-addr: 172.21.2.72:8849
            namespace: 23d0f9d9-096e-4fea-a548-e3ba778a6b83
            group: nmp-power
            file-extension: yml
            prefix: nmp-power
    
          discovery:
            server-addr: 172.21.2.72:8849
            namespace: 23d0f9d9-096e-4fea-a548-e3ba778a6b83
    
    
    #seata分布式事务配置，此为精简后的配置，大家可根据实际场景适当选择添加修改等
    seata:
      enabled: true
      application-id: power
    #  tx-service-group: default
      tx-service-group: my_test_tx_group
      enable-auto-data-source-proxy: true
      use-jdk-proxy: false
      config:
        type: nacos
        nacos:
          namespace: 23d0f9d9-096e-4fea-a548-e3ba778a6b83
          serverAddr: 172.21.2.72:8849
          group: SEATA_GROUP
          userName: "nacos"
          password: "nacos"
      registry:
        type: nacos
        nacos:
          application: seata-server
          server-addr: 172.21.2.72:8849
          namespace: 23d0f9d9-096e-4fea-a548-e3ba778a6b83
          userName: "nacos"
          password: "nacos"

或者把seata的客户端配置和此微服务的其他配置信息一起配置到nacos配置中心里，这也是一种比较可取的方案，如下图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 15][]

4、客户端业务层代码加上分布式事务注解：

//分布式事务注解 
        @GlobalTransactional(name = "default",rollbackFor = Exception.class)
        @Override
        public void saveCatAndDataRelations(ServiceSetCatModel setCatModel) {
            //省略其他业务代码.....
             saveCatAndDataRelation(setCatalogModel);
              //省略其他业务代码.....
            catInfoMapper.insertSelective(catalogInfo);
    
            if(serviceDataRelation.getServiceId()>25){
                throw new RuntimeException("出现异常");
            }
    
        }

5、启动客户端微服务后，调用接口测试分布式事务功能

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 16][]

6、抛出异常前Seata服务端数据库生成的关于事务和锁的临时信息：

global\_table  全局事务表一条信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 17][]

branch\_table   分支事务表二条信息（执行了两次插入数据库操作）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 18][]

lock\_table  全局锁表信息（两次插入四条数据，因此有四条锁信息）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 19][]

7、抛出异常之前客户端数据库 undo\_log表 生成了两条反sql（两次插入数据库）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 20][]

8、放开往下走,抛出异常 执行反sql：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 21][]

执行反sql的日志：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 22][]

9、执行反sql后客户端数据库的结果:如下图，说明反sql已经执行，回滚了事务。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 23][]

seata服务端三张表信息也执行提交完成。

10、另外，注意我这里用的是JDK8 ,如果你用高版本的jdk，比如用11、12等版本可能会报错，比如配置JDK11时，启动seata时 一闪而过（闪退），启动失败。

![20201126175213893.png][]

到此Seata服务端和客户端配置和使用流程均详细分析完成，下一篇我们分析seata源码的编译和启动，敬请期待！

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70]: /images/20221120/69720fb22c844f1fbf7f4901969a21ae.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 1]: /images/20221120/c553834969bf4d899d2aff6978ef454a.png
[20201125193943145.png]: https://img-blog.csdnimg.cn/20201125193943145.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201125202429434.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20201125193855532.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25hbmRhbzE1OA==,size_16,color_FFFFFF,t_70
[seata_nacos]: http://seata.io/zh-cn/docs/user/registry/nacos.html
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[seata_nacos 1]: http://seata.io/zh-cn/docs/user/configuration/nacos.html
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