阿里分布式事务seata

(一) seata 介绍

• Seata 是一款阿里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
• 这里演示学习使用SpringCloud/SpringBoot集成配置了Seata，并使用AT模式实现分布式事务回滚
• Seata GitHub
• Seata 官方文档
• Seata Demo GitHub

(二) Seata server 安装配置

环境准备

• Mac OS
• Mysql8
• Eureka注册中心

GitHub 下载v1.1.0 Seata v1.1.0

• unzip seata-server-1.1.0.zip
• cd /seata/conf
• 由于seatev1.1.0默认驱动是mysql5,在seata/lib目录下，将mysql-connector-java-8.0.19.jar版本的jar包替换原来的mysq5;修改file.conf中的driverClassName = “com.mysql.cj.jdbc.Driver”
• 修改file.conf如下；修改为db模式，并且配置自己的mysql数据库链接；注意service配置中的vgroupMapping.licaibo_tx_group，其中licaibo_tx_group为自己定义，到时SpringBoot集成seata的时候需要保持一致

## transaction log store, only used in seata-server
store {
  ## store mode: file、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
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
    datasource = "dbcp"
    ## mysql/oracle/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.cj.jdbc.Driver"
    url = "jdbc:mysql://localhost:3306/seat-server"
    user = "root"
    password = "root"
    minConn = 1
    maxConn = 10
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
  }


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

}

在自己的seat-server数据库需要创建三张表，具体脚本在 Seata-mysql-script

-- -------------------------------- 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`<