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Seata 环境搭建部署过程

小码code 人气:0

在使用微服务中,单体事务注解@Transactional 就不适用了,需要采用分布式事务解决方案,本文介绍分布式事务Seata的安装。Seata一款开源的分布式事务解决方案,致力于在微服务架构下提供高性能和简单易用的分布式事务服务。

seata版本: 1.5.2

前提准备

Seata是一个分布式事务,seata服务端也是一个微服务,需要和其他微服务一样需要注册中心配置中心

同时事务回滚,需要数据库日志记录。

1.下载

进入Seata官网下载,下载版本是1.5.2,找到seata-server-1.5.1.tar.gz下载。解压文件后进入seata文件。

2.建表

新建数据库seata,然后在seata文件夹里面的script文件,找到server —> db —> mysql.sql,在数据库中执行sql语句:

-- 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_status_gmt_modified` (`status` , `gmt_modified`),
    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(128),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `status`         TINYINT      NOT NULL DEFAULT '0' COMMENT '0:locked ,1:rollbacking',
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_status` (`status`),
    KEY `idx_branch_id` (`branch_id`),
    KEY `idx_xid_and_branch_id` (`xid` , `branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

CREATE TABLE IF NOT EXISTS `distributed_lock`
(
    `lock_key`       CHAR(20) NOT NULL,
    `lock_value`     VARCHAR(20) NOT NULL,
    `expire`         BIGINT,
    primary key (`lock_key`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8mb4;

INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('AsyncCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryCommitting', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('RetryRollbacking', ' ', 0);
INSERT INTO `distributed_lock` (lock_key, lock_value, expire) VALUES ('TxTimeoutCheck', ' ', 0);

全局事务会话由:全局事务、分支事务、全局锁,对应表分别为global_tablebranch_tablelock_table

3.配置 nacos

nacos控制台添加新的命名空间:

添加一条seata命名空间ID在后面需要用到:

3.1 上传配置至Nacos配置中心

进到seata目录中,找到nacos-config.sh文件,路径:script -> config-center -> nacos -> nacos-config.sh。执行nacos-config.sh脚本:

sh nacos-config.sh -h 127.0.0.1 -p 8848 -g SEATA_GROUP -t xxxx -u username -w password

参数详解:

执行脚本之后,输出以下脚本:

Set server.maxCommitRetryTimeout=-1 successfully 
Set server.maxRollbackRetryTimeout=-1 successfully 
Set server.rollbackRetryTimeoutUnlockEnable=false successfully 
Set server.distributedLockExpireTime=10000 successfully 
Set server.xaerNotaRetryTimeout=60000 successfully 
Set server.session.branchAsyncQueueSize=5000 successfully 
Set server.session.enableBranchAsyncRemove=false successfully 
Set server.enableParallelRequestHandle=false successfully 
Set metrics.enabled=false successfully 
Set metrics.registryType=compact successfully 
Set metrics.exporterList=prometheus successfully 
Set metrics.exporterPrometheusPort=9898 successfully 

再去nacos控制台查看配置:

说明配置上传成功。上传不成功,大部分原因是配置没有配置成功,比如命名空间ID没配置正确。

4.修改 appplication.yml

找到appplication.yml文件,路径为:seata -> conf -> application.yml,以下三个小节分别配置storeconfigregistry:

4.1 seata.store

seata.store配置seata的存储,修改store.mode="db":

seata:
  store:
    # support: file 、 db 、 redis
    mode: db

修改数据库连接,将 seata -> conf -> application.example.yml中附带额外配置,将其db相关配置复制至application.yml,修改store.db相关属性。数据库是步骤一配置的数据库:

seata:
  store:
    # support: file 、 db 、 redis
    mode: db
    db:
      datasource: druid
      db-type: mysql
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://xxxxx:3306/seata?rewriteBatchedStatements=true
      user: xxxx
      password: xxx
      min-conn: 5
      max-conn: 100
      global-table: global_table
      branch-table: branch_table
      lock-table: lock_table
      distributed-lock-table: distributed_lock
      query-limit: 100
      max-wait: 5000

4.2 seata.config

seata.config是配置nacos配置中心相关的配置。将seata.config.type修改成nacos

seata:
  config:
    # support: nacos, consul, apollo, zk, etcd3
    type: nacos

然后添加seata.config.nacos相关的配置:

seata:
  config:
    # support: nacos, consul, apollo, zk, etcd3
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      group : "SEATA_GROUP"
      namespace: "xxxxx"
      username: "xxx"
      password: "xxx"

其中namespace是步骤3中的命名空间ID

4.3 seata.registry

seata.registry是配置注册中心相关字段,将seata服务作为一个微服务注册到注册中心。将registry.type改成nacos,配置如下:

seata:
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    type: nacos
    nacos:
      application: "seata-server"
      serverAddr: 127.0.0.1:8848
      group: "SEATA_GROUP"
      namespace: "xxxxxx"
      username: "xxxx"
      password: "xxx"

namespace也是步骤3中的命名空间ID

启动

找到seata文件中的bin目录,执行启动命令:

seata-server.sh -h 127.0.0.1 -p 8091 -m db

控制台输出:

apm-skywalking not enabled
seata-server is starting, you can check the /opt/seata/logs/start.out

打开start.out日志:

系统启动成功,再登录 http://127.0.0.1:7091,就能看到seata控制台信息。

nacos控制台服务列表新增了一个服务,说明seata服务成功注册到了nacos注册中心:

总结

参考

Seata新手部署指南

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