springcloud+eureka+seata（AT模式）解决

作者: 你笑时很美丶 | 来源:发表于2021-07-29 13:55 被阅读0次

我这里是Centos7，第一步先安装java环境；
下载steata包，下载地址：seata1.4.2
上传到linux的/software/目录后解压

cd /software/
tar -zxvf seata-server-1.4.2.tar.gz
cd /seata/seata-server-1.4.2

4.修改registry.conf文件

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  # 指定注册中心为eureka，以下只需要配置eureka相关配置参数即可
  type = "eureka"

  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }
  eureka {
    #修改了宿主机的hosts，将注册中心的ip统一为指定域名，方便维护
    serviceUrl = "http://127.0.0.1:8761/eureka"
    #自定义注册中心服务名
    application = "SEATA"
    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"
    aclToken = ""
  }
  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 = "file"

  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
    dataId = "seataServer.properties"
  }
  consul {
    serverAddr = "127.0.0.1:8500"
    aclToken = ""
  }
  apollo {
    appId = "seata-server"
    ## apolloConfigService will cover apolloMeta
    apolloMeta = "http://192.168.1.204:8801"
    apolloConfigService = "http://192.168.1.204:8080"
    namespace = "application"
    apolloAccesskeySecret = ""
    cluster = "seata"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
    nodePath = "/seata/seata.properties"
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    # 存储模式的配置
    name = "file.conf"
  }
}

5.修改file.conf

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  # 指定存储模式为db，集群必须配置为db
  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
  # 第一步创建数据表的数据库配置参数
  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.cj.jdbc.Driver"
    ## if using mysql to store the data, recommend add rewriteBatchedStatements=true in jdbc connection param
    url = "jdbc:mysql://xxx:3306/test_seata"
    user = "xxx"
    password = "xxx"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }

  ## redis store property
  redis {
    ## redis mode: single、sentinel
    mode = "single"
    ## single mode property
    single {
      host = "127.0.0.1"
      port = "6379"
    }
    ## sentinel mode property
    sentinel {
      masterName = ""
      ## such as "10.28.235.65:26379,10.28.235.65:26380,10.28.235.65:26381"
      sentinelHosts = ""
    }
    password = ""
    database = "0"
    minConn = 1
    maxConn = 10
    maxTotal = 100
    queryLimit = 100
  }
}

启动

#在test_seata数据库建以下几张表，建表语句：
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`)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

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`)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

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`)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

#后台运行
nohup ./bin/seata-server.sh -p 8091 -h 127.0.0.1 -m db &> ./logs/seata.log &
#查看日志，看到-Server started即成功，再打开eureka是否有注册上去
tail -f ./logs/seata.log

-p 指定启动seata server的端口号；
-h 指定seata server所绑定的主机；
-m 事务日志、事务执行信息存储的方式，目前支持file（文件方式）、db（数据库方式，建表语句请查看步骤6）

在项目中使用，添加依赖（seata-spring-boot-starter方式，可直接在application.yml/application.properties中进行配置，但是需要手动传递XID；而使用spring-cloud-alibaba-seata，需要在每个微服务中添加registry.conf和file.conf文件，这里结合）：

      <dependency>
          <groupId>com.alibaba.cloud</groupId>
          <artifactId>spring-cloud-alibaba-seata</artifactId>
          <version>2.2.0.RELEASE</version>
      </dependency>
      <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>

application.yml中添加：

#seata 配置， 代替file.conf和registry.conf配置
seata:
  enabled: true
  # 你的服务名称
  application-id: ${spring.application.name}
  #自定义group
  tx-service-group: test-seata
  # 开启数据源自动代理
  enable-auto-data-source-proxy: true
  service:
    vgroup-mapping:
      #这里对应端的file.conf中vgroup_mapping.seata_server_group = "seata-server"
     test-seata: SEATA
      enable-degrade: false
      disable-global-transaction: false
  # Eureka配置
  registry:
    type: eureka
    eureka:
      service-url: http://127.0.0.1:8761/eureka

9.seata1.1.0以后，不需要手动代理数据源，启动类上@SpringBootApplication（exclude = DataSourceAutoConfiguration.class)：

自定义数据源

在你需要使用feign进行微服务间调到的方法上添加注解@GlobalTransactional

注解
每个涉及到分布式事务的微服务的数据库都要有一张undo_log日志表，sql如下：

DROP TABLE IF EXISTS `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=utf8mb4 COLLATE=utf8mb4_general_ci;

在需要微服务调用的微服务中进行以上相同配置（7.8.9.10.12）,除了@GlobalTransactional注解，之后便可以抛出异常看是否回滚成功

注：seata集群只需要再以其他端口启动seata文件目录即可

seata集群

docker-compose编排部署：

version: "3"
services:
  seata-server:
    image: seataio/seata-server:1.4.2
    container_name: seata-server
    hostname: seata-server
    networks:
      - seata-server
    ports:
      - "8091:8091"
    environment:
      #宿主机ip
      - SEATA_PORT=8091
      # 指定seata-server的事务日志存储方式, 支持db ,file（默认）,redis
      - STORE_MODE=db
      #seata的被发现地址，该IP用于向注册中心注册时使用（也就是自身的ip）
      - SEATA_IP=127.0.0.1
      #给予权限
      #- privileged=true
    volumes:
      - /software/docker/seata/config/registry.conf:/seata-server/resources/registry.conf
      - /software/docker/seata/config/file.conf:/seata-server/resources/file.conf
      - /software/docker/seata/mysql-connector-java-8.0.16.jar:/seata-server/libs/mysql-connector-java-8.0.16.jar
      - /project/docker/seata/logs:/root/logs/seata
      - /etc/localtime:/etc/localtime
networks:
  seata-server:
    driver: bridge

springcloud+eureka+seata（AT模式）解决

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