Seata 分布式事物 1.4.0版本 实践 + 测试

Seata 分布式事物

Seata 是一款开源的分布式事务解决方案，致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式，为用户打造一站式的分布式解决方案。

详细介绍可参考文档 :seata.io/zh-cn/docs/…

下载

 https://seata.io/zh-cn/blog/download.html

我这里用的是Seata 1.4.0版本

使用

解压压缩包进入到conf文件夹下.这里会有几个配置文件,修改配置

1:file.conf

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  ## 将file改为db 用db处理事物  下边的db选项直接改为自己的数据源 
  mode = "db"

  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }

  ## 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://192.168.10.65:3308/seata"
    user = "root"
    password = "root"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }

  ## redis store property
  redis {
    host = "127.0.0.1"
    port = "6379"
    password = ""
    database = "0"
    minConn = 1
    maxConn = 10
    maxTotal = 100
    queryLimit = 100
  }

}

2:registry.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  # 这里的注册中心用的是nacos,改为nacos ,之后只需要修改nacos对应的配置即可
  type = "nacos"  
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

  nacos {
    application = "seata-server"
    serverAddr = "192.168.10.65:8848" #nacos地址
    group = "SEATA_GROUP" #服务注册的分组
    namespace = "0af6e97b-a684-4647-b696-7c6d42aecce7" #服务注册的命名空间,不填默认是public
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = 0
    password = ""
    cluster = "default"
    timeout = 0
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  consul {
    cluster = "default"
    serverAddr = "127.0.0.1:8500"
  }
  etcd3 {
    cluster = "default"
    serverAddr = "http://localhost:2379"
  }
  sofa {
    serverAddr = "127.0.0.1:9603"
    application = "default"
    region = "DEFAULT_ZONE"
    datacenter = "DefaultDataCenter"
    cluster = "default"
    group = "SEATA_GROUP"
    addressWaitTime = "3000"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  # 为了方便后期维护,配置也直接用nacos ,使用这个选项需要先把 配置信息 上传 到nacos中
  type = "nacos"
  # 同样需要修改nacos即可
  nacos {
    serverAddr = "192.168.10.65:8848"
    namespace = "0af6e97b-a684-4647-b696-7c6d42aecce7"
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    appId = "seata-server"
    apolloMeta = "http://192.168.1.204:8801"
    namespace = "application"
    apolloAccesskeySecret = ""
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

3:将配置导入到nacos

这里需要准备两个文件:
config.txt(seata的配置信息)
nacos-config.sh(把配置信息上传到nacos的脚本)
这两个文件是下载的Seata里没有的需要自己去github上下载

下载地址:
nacos-config.sh: github.com/seata/seata…
config.txt: github.com/seata/seata…

下载好之后需要把 nacos-config.sh 放到 seata/conf 文件夹下,和 registry.conf这两个文件夹同级
下载好之后需要把 config.txt 放到 seata 文件夹下, 和conf文件夹同级

3.1 修改config.txt文件

这个文件就是seata的配置信息,需要修改数据库配置和mode配置

#这里只列出几个主要修改的信息
#事物存储配置
store.mode=db # file改为db

#数据库配置
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://192.168.10.65:3308/jy-seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=root
#这个是事物的分组,这个可以配置多个 
# 格式: 
# service.vgroupMapping.改这里改成自己需要的=default
service.vgroupMapping.default_tx_group=default

3.2 运行 nacos-config.sh 脚本

 sh nacos-config.sh -h 192.168.10.65 -p 8848 -g SEATA_GROUP -t 0af6e97b-a684-4647-b696-7c6d42aecce7 -u nacos -w nacos

 # -h -p 指定nacos的端口地址；
 # -t    指定命名空间id；(这里需要提前创建一个命名空间,因为这个配置特别多.最好不要弄到默认的...)
 # -g    指定配置的分组，注意，是配置的分组(上传的配置都会到这个分组下)；
 # -u -w 指定nacos的用户名和密码，
 

创建数据库

因为上边咱们配置的是用数据库来存储事物,所以需要创建相应的数据库,总共是四个表

-- 创建seata数据库并创建表 这三个表是seata服务用的
DROP DATABASE IF EXISTS `seata`;

CREATE DATABASE  `seata` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

USE `seata`;

-- -------------------------------- The script used when storeMode is 'db' --------------------------------
-- the table to store GlobalSession data
CREATE TABLE IF NOT EXISTS `global_table`
(
    `xid`                       VARCHAR(128) NOT NULL,
    `transaction_id`            BIGINT,
    `status`                    TINYINT      NOT NULL,
    `application_id`            VARCHAR(32),
    `transaction_service_group` VARCHAR(32),
    `transaction_name`          VARCHAR(128),
    `timeout`                   INT,
    `begin_time`                BIGINT,
    `application_data`          VARCHAR(2000),
    `gmt_create`                DATETIME,
    `gmt_modified`              DATETIME,
    PRIMARY KEY (`xid`),
    KEY `idx_gmt_modified_status` (`gmt_modified`, `status`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

-- the table to store BranchSession data
CREATE TABLE IF NOT EXISTS `branch_table`
(
    `branch_id`         BIGINT       NOT NULL,
    `xid`               VARCHAR(128) NOT NULL,
    `transaction_id`    BIGINT,
    `resource_group_id` VARCHAR(32),
    `resource_id`       VARCHAR(256),
    `branch_type`       VARCHAR(8),
    `status`            TINYINT,
    `client_id`         VARCHAR(64),
    `application_data`  VARCHAR(2000),
    `gmt_create`        DATETIME(6),
    `gmt_modified`      DATETIME(6),
    PRIMARY KEY (`branch_id`),
    KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(96),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;



--这个表是每个业务数据库中都需要有 ,用了存储回滚的数据
-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
    ) ENGINE = InnoDB
    AUTO_INCREMENT = 1
    DEFAULT CHARSET = utf8mb4 COMMENT ='AT transaction mode undo table';
    

修改Spring Boot配置文件

# seata配置
seata:
  # 默认关闭，如需启用spring.datasource.dynami.seata需要同时开启 ****************
  enabled: true
  # Seata 应用编号，默认为 ${spring.application.name}
  application-id: ${spring.application.name}
  # Seata 事务组编号，用于 TC 集群名  这个就是上边配置文件中的分组     *****************
  tx-service-group: ${spring.application.name}-group
  # 关闭自动代理
  enable-auto-data-source-proxy: false
  # 服务配置项
  service:
    # 虚拟组和分组的映射
    vgroup-mapping:
      jy-company-document-group: default   #这里要和配置文件中的一致 **************
  config:
    type: nacos
    nacos:
      serverAddr: 192.168.10.65:8848
      group: SEATA_GROUP
      namespace: 0af6e97b-a684-4647-b696-7c6d42aecce7
  registry:
    type: nacos
    nacos:
      application: seata-server
      server-addr: 192.168.10.65:8848
      namespace: 0af6e97b-a684-4647-b696-7c6d42aecce7

启动seata

进到bin目录直接启动 ./seata-server.bat

查看日志,seata启动正常,nacos中可以看到seata注册成功

使用:只需要早事物开启的地方加上@GlobalTransactional注解就可以了,其他方法还是加上 @Transactional(rollbackFor = Exception.class)注解

    @Override
    @GlobalTransactional // 重点 第一个开启事务的需要添加seata全局事务注解
    public AjaxResult addUserByAddressBook(SysUser sysUser) {
        AjaxResult ajaxResult = remoteUserService.addUserInfo(sysUser, SecurityConstants.INNER);
        if (HttpStatus.SUCCESS == ajaxResult.getCode()) {
            //在通讯录上关联用户Id
            AddressBook addressBook = new AddressBook();
            addressBook.setAbId(sysUser.getAddressBookId());
            addressBook.setSysUserId(Long.parseLong(String.valueOf(ajaxResult.get("userId"))));
            addressBookMapper.updateAddressBook(addressBook);
        }
        return ajaxResult;
    }


  
    /**
     * 新增保存用户信息
     *
     * @param user 用户信息
     * @return 结果
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public int insertUser(SysUser user) {
            user.setCreateTime(new Date());
            // 新增用户信息
            int rows = userMapper.insertUser(user);
            // 新增用户岗位关联
            insertUserPost(user);
            // 新增用户与角色管理
            insertUserRole(user);
            return rows;
    }
   
  

使用中遇到的问题

1.4.0版本在使用中会遇到如果时间序列化失败的问题.如果时间格式是dataTime格式则会失败 解决放法
1:修改时间格式为timestamp格式:这种不适合已经上线了的项目.
2:修改seata序列化方式为 kryo
在项目中引入依赖

        <dependency>
            <groupId>com.esotericsoftware</groupId>
            <artifactId>kryo</artifactId>
            <version>4.0.2</version>
        </dependency>
        <dependency>
            <groupId>de.javakaffee</groupId>
            <artifactId>kryo-serializers</artifactId>
            <version>0.44</version>
        </dependency>

修改seata配置文件

<!--修改 client.undo.logSerialization 为kryo 即可-->
client.undo.logSerialization=kryo

重新启动seata

代码这里代码用的是 若依:RuoYi-Cloud进行的测试:gitee.com/y_project/R…