Simple Extensible Autonomous Transacation Architecture，seata是简单的、可扩展、自主性高的分布式架构

SEATA Server Configure

因我们使用正式的1.0.0-GA 版本，网上大多数找到的说明都是0.X版本，有不少变动，比如，在server中取消了db_store.sql的脚本，如找不到相关内容，可以通过源码来查找，比如db脚本源码： mysql db script

1.下载 seata-server

2.创建数据库（seata）,可自定义，在file.conf中要用到。

-- -------------------------------- 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 = utf8;

-- 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,

`gmt_modified` DATETIME,

PRIMARY KEY (`branch_id`),

KEY `idx_xid` (`xid`)

) ENGINE = InnoDB

DEFAULT CHARSET = utf8;

-- 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 = utf8;

3. 编辑 file.conf 配置文件

service {
#transaction service group mapping
vgroup_mapping.sunrise_tx_group = "default"
#only support when registry.type=file, please don't set multiple addresses
default.grouplist = "127.0.0.1:8091"
#disable seata
disableGlobalTransaction = false
#degrade current not support
enableDegrade = false
#disable
disable = false
#unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
max.commit.retry.timeout = "-1"
max.rollback.retry.timeout = "-1"
}

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

## file store property
file {
## store location dir
dir = "sessionStore"
#degrade current not support
enableDegrade = false
#disable
disable = false
#unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
max.commit.retry.timeout = "-1"
max.rollback.retry.timeout = "-1"
}

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

## file store property
file {
## store location dir
dir = "sessionStore"
}

## database store property
db {
## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
datasource = "dbcp"
## mysql/oracle/h2/oceanbase etc.
db-type = "mysql"
driver-class-name = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://localhost:3306/seata"
user = "wr"
password = "wr"
min-conn = 1
max-conn = 3
global.table = "global_table"
branch.table = "branch_table"
lock-table = "lock_table"
query-limit = 100
}
}

4. 编辑 conf/regiester.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  # 更改1
  type = "eureka"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
  eureka {
      # 更改2
    serviceUrl = "http://localhost:21001/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  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 = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    app.id = "seata-server"
    apollo.meta = "http://192.168.1.204:8801"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

本次实现，我们还没有添加configration的时候，因此只需要更改 register 块中的相关属性即可，在后续我们实现了 nacos config 之后，再同步更新这里。

5. 启动服务端

[root@localhost.localdomain /usr/local/geekplus/server/seata]# bin/seata-server.sh

在 eureka 中看到如下8091端口的服务之后，即启动 seata-server 正常！

Client Configure

AT Model

需要在每一个业务库中添加数据表 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;

Broadway-Demo

使用Springboot项目有一个小规律，我叫它为使用三部曲。依 broadway-ws-tally-service 项目为例：

第一步：加依赖

        <!--seata-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-seata</artifactId>
            <version>2.1.0.RELEASE</version>
            <exclusions>
                <exclusion>
                    <artifactId>seata-all</artifactId>
                    <groupId>io.seata</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>1.0.0</version>
        </dependency>

第二步：开启注解

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

在这里需要说明一下，我们需要排除掉SpringBoot默认自动注入的 DataSourceAutoConfiguration Bean, 因为 SEATA 是基于数据源拦截来实现的分布式事务，因此，我们需要自定义数据源配置信息：

package com.geekplus.broadway.ws.tally.application;

import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;

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

    @Primary
    @Bean("dataSource")
    public DataSourceProxy dataSource(DataSource druidDataSource){
        return new DataSourceProxy(druidDataSource);
    }

    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy)throws Exception{
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:/com/geekplus/*.xml"));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }
}

该配置类，一般放在与启动类相同的目录即可！

第三部：改配置

spring:
  cloud:
    alibaba:
      seata:
        tx-service-group: sunrise_tx_group

TIPS: tx-service-group 一定要server，client都要保持一致，否则能坑死你！ tx-service-group 一定要server，client都要保持一致，否则能坑死你！ tx-service-group 一定要server，client都要保持一致，否则能坑死你！

以上三步是大多数SpringBoot 项目的通用做法，当然我们的SEATA暂时还不是那么完善，配置信息目前还不支持在 application.yml 中配置完全，因此，我们需要2个核心的client 配置文件 file.conf 和 register.conf .

file.conf 该文件主要是用于连接RM的，我们只需要关注上面所说的 tx-service-group 就行，其他配置默认就可以。

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  # the client batch send request enable
  enable-client-batch-send-request = 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
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}

service {
  #transaction service group mapping
  vgroup_mapping.sunrise_tx_group = "default"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #disable seata
  disableGlobalTransaction = false
}

client {
  rm {
    async.commit.buffer.limit = 10000
    lock {
      retry.internal = 10
      retry.times = 30
      retry.policy.branch-rollback-on-conflict = true
    }
    report.retry.count = 5
    table.meta.check.enable = false
    report.success.enable = true
  }
  tm {
    commit.retry.count = 5
    rollback.retry.count = 5
  }
  undo {
    data.validation = true
    log.serialization = "jackson"
    log.table = "undo_log"
  }
  log {
    exceptionRate = 100
  }
  support {
    # auto proxy the DataSource bean
    spring.datasource.autoproxy = false
  }
 }

register.conf 该文件是用于指定注册中心相关配置的，它有2个核心 block ：
registry块此模板表明我们的注册中心使用类型，需要根据 type 设置来同步更新使用的配置信息，比如我们使用的 eureka ，因此我们更新 eureka.serviceUrl="http://172.16.1.187:21001/eureka" .
config 块该模块用来设置我们的配置中心相关配置（此处后续更新，我们会选择 apollo ）

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

  nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://172.16.1.187:21001/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  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 = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    app.id = "seata-server"
    apollo.meta = "http://192.168.1.204:8801"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

作者：Isaac-Zhang

链接：https://juejin.im/post/5e1ee7296fb9a0301942f3c9

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来源：oschina

链接：https://my.oschina.net/u/4439464/blog/3159308

标签

Seata

SEATA 分布式事务入门DEMO

SEATA Server Configure

Client Configure

AT Model

Broadway-Demo