seata服务端和客户端配置(使用nacos进行注册发现,使用mysql进行数据持久化),以及过程中可能会出现的问题与解决方案

说明:

之所以只用nacos进行了注册与发现,因为seata使用nacos后进行配置中心的化,需要往nacos中导入py脚本生成配置,还需要在服务端多加两个配置,过程比较繁琐,容易出问题,不太适合对这个框架理解不是很深的开发者

版本说明:

mysql 5.7
seata 1.4
springboot:2.3.7
springcloud:Hoxton.SR12
springcloudAlibaba: 2.2.6.RELEASE

服务端搭建及配置

下载seata 下载地址:下载中心 (seata.io)
上传至虚拟机/服务器/本地

解压该文件:解压后
进入conf目录

修改registry.conf文件

对应配置:

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "192.168.3.160:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }
  
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "file"

  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
  }

  file {
    name = "file.conf"
  }
}

修改file.config文件

对应配置:

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  mode = "db"

  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata"
    user = "root"
    password = "123456"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }
}

因为我们这里配置的持久化方式为mysql,在第六步中也有体现,这里需要将第六步配置的数据库创建出来

创建数据库库名为seata

导入SQL脚本,脚本为:

/*
 Navicat Premium Data Transfer

 Source Server         : Mysql3.160
 Source Server Type    : MySQL
 Source Server Version : 50732
 Source Host           : 192.168.3.160:3306
 Source Schema         : seata

 Target Server Type    : MySQL
 Target Server Version : 50732
 File Encoding         : 65001

 Date: 13/12/2021 14:33:52
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for branch_table
-- ----------------------------
DROP TABLE IF EXISTS `branch_table`;
CREATE TABLE `branch_table`  (
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) NULL DEFAULT NULL,
  `resource_group_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `branch_type` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `status` tinyint(4) NULL DEFAULT NULL,
  `client_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `gmt_create` datetime(6) NULL DEFAULT NULL,
  `gmt_modified` datetime(6) NULL DEFAULT NULL,
  PRIMARY KEY (`branch_id`) USING BTREE,
  INDEX `idx_xid`(`xid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of branch_table
-- ----------------------------

-- ----------------------------
-- Table structure for global_table
-- ----------------------------
DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table`  (
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) NULL DEFAULT NULL,
  `status` tinyint(4) NOT NULL,
  `application_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `transaction_service_group` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `transaction_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `timeout` int(11) NULL DEFAULT NULL,
  `begin_time` bigint(20) NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `gmt_create` datetime NULL DEFAULT NULL,
  `gmt_modified` datetime NULL DEFAULT NULL,
  PRIMARY KEY (`xid`) USING BTREE,
  INDEX `idx_gmt_modified_status`(`gmt_modified`, `status`) USING BTREE,
  INDEX `idx_transaction_id`(`transaction_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of global_table
-- ----------------------------

-- ----------------------------
-- Table structure for lock_table
-- ----------------------------
DROP TABLE IF EXISTS `lock_table`;
CREATE TABLE `lock_table`  (
  `row_key` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `xid` varchar(96) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `transaction_id` bigint(20) NULL DEFAULT NULL,
  `branch_id` bigint(20) NOT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `table_name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `pk` varchar(36) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `gmt_create` datetime NULL DEFAULT NULL,
  `gmt_modified` datetime NULL DEFAULT NULL,
  PRIMARY KEY (`row_key`) USING BTREE,
  INDEX `idx_branch_id`(`branch_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of lock_table
-- ----------------------------

SET FOREIGN_KEY_CHECKS = 1;

导入后样子:

至此服务端配置配置完成,cd目录到bin目录通过以下命令进行启动,-h 127.0.0.1 可替换为真实的虚拟机地址,最好指定真实的,否则可能出现无法预估的错误
```
nohup sh seata-server.sh -p 8091 -h 127.0.0.1 -m file > catalina.out 2>&1 &
```

客户端配置

引入seata依赖

<!--seata-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
    <version>2021.1</version>
</dependency>
<!--mybatis-plus 因为需要替换mybatisplus的数据源,所以引入了这个依赖-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <scope>provided</scope>
</dependency>

在resources下添加两个文件,分别为file.conf和registry.conf

registry.conf内容为

内容为:

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "192.168.3.160:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }
  file {
    name = "file.conf"
  }
}
config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "file"
  nacos {
    serverAddr = "192.168.3.160:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
  }
  file {
    name = "file.conf"
  }
}

file.conf内容为:此处需注意vgroupMapping这里进行了修改,原为vgroup_mapping,不改为驼峰会出现ip:port这个错误,导致项目起不来

内容如下:

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  #thread factory for netty
  thread-factory {
    boss-thread-prefix = "NettyBoss"
    worker-thread-prefix = "NettyServerNIOWorker"
    server-executor-thread-prefix = "NettyServerBizHandler"
    share-boss-worker = false
    client-selector-thread-prefix = "NettyClientSelector"
    client-selector-thread-size = 1
    client-worker-thread-prefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    boss-thread-size = 1
    #auto default pin or 8
    worker-thread-size = 8
  }
}

service {
  #vgroup->rgroup
  vgroupMapping.from-sys_tx_group = "default"
  #only support single node
  default.grouplist = "192.168.3.160:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
}
## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  mode = "db"
  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://192.168.3.160:3306/seata"
    user = "root"
    password = "123456"
    minConn = 5
    maxConn = 30
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }
}

application.yml需配置以下内容:

内容如下:

spring:
  #---------------数据库连接配置--------------
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    # 连接url
    url: jdbc:mysql://192.168.3.160:3306/from-sys?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&serverTimezone=Asia/Shanghai&nullCatalogMeansCurrent=true
    # 驱动名称
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT user()
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    connection-properties: druid.stat.mergeSql:true;druid.stat.slowSqlMillis:5000
  # -------------- nacos配置---------------
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.3.160:8848
    alibaba:
      seata:
        tx-service-group: ${spring.application.name}_tx_group
seata:
  registry:
    type: nacos
    nacos:
      server-addr: 192.168.3.160:8848
      group: "SEATA_GROUP"
      namespace: ""
      username: "nacos"
      password: "nacos"
server:
  port: 9001
  servlet:
    context-path: /sys/

配置代理数据源

package com.from.seata.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;
import com.baomidou.mybatisplus.core.MybatisConfiguration;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import io.seata.rm.datasource.DataSourceProxy;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;

@Configuration
@EnableConfigurationProperties({MybatisPlusProperties.class})
public class DataSourcesProxyConfig {
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }
    //创建代理数据源

    @Primary//@Primary标识必须配置在代码数据源上，否则本地事务失效
    @Bean
    public DataSourceProxy dataSourceProxy(DataSource druidDataSource) {
        return new DataSourceProxy(druidDataSource);
    }

    private MybatisPlusProperties properties;

    public DataSourcesProxyConfig(MybatisPlusProperties properties) {
        this.properties = properties;
    }

    //替换SqlSessionFactory的DataSource
    @Bean
    public MybatisSqlSessionFactoryBean sqlSessionFactory(DataSourceProxy dataSourceProxy) throws Exception {
        // 这里必须用 MybatisSqlSessionFactoryBean 代替了 SqlSessionFactoryBean，否则 MyBatisPlus 不会生效
        MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean = new MybatisSqlSessionFactoryBean();
        mybatisSqlSessionFactoryBean.setDataSource(dataSourceProxy);
        mybatisSqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());

//        mybatisSqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
//                .getResources("classpath:/mapper/**/*.xml"));

        MybatisConfiguration configuration = this.properties.getConfiguration();
        if(configuration == null){
            configuration = new MybatisConfiguration();
        }
        mybatisSqlSessionFactoryBean.setConfiguration(configuration);
        return mybatisSqlSessionFactoryBean;
    }
}

至此seata的分布式事务就配置完成了,可以优化为seata单独抽成一个模块,当我们服务需要使用分布式事务时候,引入seata模块的依赖,进行相同的配file,registry,yml配置即可,只需修改以下下内容,其他配置不变即可

你可能遇到的bug:

1.Failed to get available servers: endpoint format should like ip:port
```
file.conf中的vgroupMapping你用的可能是vgroup_mapping
```
0101 can not connect to 127.0.0.1:8091 cause:can not register RM,err:can not connect to services-server. nacos注册发现的情况下:则是由于yml里面没有配置seata的注册发现造成的
0101 can not connect to 远程地址:8091 cause:can not register RM,err:can not connect to services-server.

由于你的启动seata服务时候没有指定IP端口造成的,导致你注册到nacos上的seata服务地址跟你客户端预想的seata地址不一致造成的,修改为真实的你的服务器地址