Seata1.2.0配置及分布式事务失效解决

配置

版本说明：
springCloud Alibaba组件版本关系
我用的是 cloud Alibaba 2.2.1.RELEASE 、springboot 2.2.5.RELEASE、nacos 1.2.1、seata1.2.0

1. 配置数据库

seata 主要的任务便是对数据库进行事务回滚，保证事务的一致性，所以我们需要先行配置数据库，seata需要一个进行事务管理的数据库用于自身使用。
MySQL中创建 seata 数据库，存储引擎为 InnoDB(默认)

-- the table to store GlobalSession data
drop table if exists `global_table`;
create table `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`)
);

-- the table to store BranchSession data
drop table if exists `branch_table`;
create table `branch_table` (
  `branch_id` bigint not null,
  `xid` varchar(128) not null,
  `transaction_id` bigint ,
  `resource_group_id` varchar(32),
  `resource_id` varchar(256) ,
  `lock_key` varchar(128) ,
  `branch_type` varchar(8) ,
  `status` tinyint,
  `client_id` varchar(64),
  `application_data` varchar(2000),
  `gmt_create` datetime,
  `gmt_modified` datetime,
  primary key (`branch_id`),
  key `idx_xid` (`xid`)
);

-- the table to store lock data
drop table if exists `lock_table`;
create table `lock_table` (
  `row_key` varchar(128) not null,
  `xid` varchar(96),
  `transaction_id` long ,
  `branch_id` long,
  `resource_id` varchar(256) ,
  `table_name` varchar(32) ,
  `pk` varchar(36) ,
  `gmt_create` datetime ,
  `gmt_modified` datetime,
  primary key(`row_key`)
);

2. 在涉及到的其它业务库中添加日志表 undo_log

该表用于事务回滚时，数据的恢复

-- the table to store seata xid data
-- 0.7.0+ add context
-- you must to init this sql for you business databese. the seata server not need it.
-- 此脚本必须初始化在你当前的业务数据库中，用于AT 模式XID记录。与server端无关（注：业务数据库）
-- 注意此处0.3.0+ 增加唯一索引 ux_undo_log
drop table `undo_log`;
CREATE TABLE `undo_log` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

3. 修改配置文件

3.1 file.conf

## seata-service
service {
  #交易服务组映射 的组名称必须要与客户端一致 my_test_tx_group  seata-server必须要与registrt.conf 一致
  #transaction service group mapping
  #TODO 修改 hxlh_tx_group为自己设置的事务组名称，seata-server不是事务组的名称，这里可以随便起名
  vgroupMapping.hxlh_tx_group = "seata-server"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #disable seata
  disableGlobalTransaction = false
}


## transaction log store, only used in seata-server
store {
  ## store mode: file、db
  ##TODO 修改为数据库类型
  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
  #TODO 下面这一堆就安装自己MySQL去改就行了，使用的库便是我们上面创建的seata库
  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://172.16.156.201:3306/seata"
    user = "root"
    password = "root"
    minConn = 5
    maxConn = 30
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }
}

3.2 registry.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  #TODO 配置为nacos
  type = "nacos"

#TODO 设置你自己的nacos即可
  nacos {
    application = "seata-server"
    serverAddr = "localhost:8848"
    namespace = "public"
    cluster = "default"
    username = ""
    password = ""
  }
  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
  type = "nacos"

  nacos {
    serverAddr = "localhost:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    appId = "seata-server"
    apollometa = "http://192.168.1.204:8801"
    namespace = "application"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

4. 启动 (先启动nacos，然后启动seata) 4.1 seata 启动

bin 目录下 seata-server.bat 直接双击

4.2 启动闪退解决

提示没有logs文件夹

解决：在bin同级目录下新建logs文件夹，在logs中新建seata_gc.log如果还是闪退的话就新建环境变量，path里面直接 E:seatabin，这个路径为seata目录

5. 配置Springboot 5.1 pom.xml

		
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-nacos-discovery
        

        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-seata
            
                
                    io.seata
                    seata-spring-boot-starter
                
            
        
        
            io.seata
            seata-spring-boot-starter
            1.2.0
            
                
                    io.seata
                    seata-all
                
            
        
        
            io.seata
            seata-all
            1.2.0
        

        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        
        
        
            mysql
            mysql-connector-java
            5.1.37
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.10
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
        
        
            org.projectlombok
            lombok
            true
        
        

5.2 配置文件

application.yml

server:
  port: 2001

spring:
  application:
    name: seata-order-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
        username: nacos
        password: nacos
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/seata_order?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
    username: root
    password: root

feign:
  hystrix:
    enabled: false

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.hbsi.entity

# seata的配置在这里
seata:
  enabled: true
  application-id: ${spring.application.name}
  tx-service-group: my_test_tx_group

5.3 必须要配置 DruidDataSource 数据源，不配就报错

@Configuration
public class DBConfig {
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }
}

6. 使用 @GlobalTransactional 注解进行分布式事务管理

seata 事务失效常见场景 1. 无法获取XID

在每个微服务中调用 RootContext.getXID() 方法检查XID是否一致

1.1 解决方法1：

需要引用spring-cloud-starter-alibaba-seata依赖。这个依赖里才有xid传递的功能。 seata-spring-boot-starter依赖，并没有传递功能

1.2解决方法2：

在调用各个微服务时，直接将XID进行手动传参绑定RootContext.bind(XID);

2. Feign调用了fallback降级或异常处理

手动回滚 ：GlobalTransactionContext.reload(RootContext.getXID()).rollback()
手动提交：GlobalTransactionContext.reload(RootContext.getXID()).commit()

undo_log表有脏数据

清除undo_log表以及seata持久化数据库的brach_table、global_table、lock_table、undo_log表中的脏数据