SEATA

目录

• 1. 官网
• 2. 下载地址
• 3. server端安装
  • 3.1. 默认端口-7091
  • 3.2. 启动类型
  • 3.3. 说明事项
    • 3.3.1. 业务系统和seata服务端之间的服务发现，可以是独立的
• 4. application.yml
  • 4.1. nacos配置中心配置
• 5. Server端注册中心
• 6. Server端配置中心
• 7. 数据存储
  • 7.1. mysql方式
    • 7.1.1. 初始化表
    • 7.1.2. seata的服务application.yml也有同步调整
• 8. Server启动
• 9. 【AT】业务客户端如何连接SEATA 的TC
  • 9.1. 总结
  • 9.2. 事务发起者
    • 9.2.1. pom引入seata依赖
    • 9.2.2. 创建UNDO_LOG 表（AT模式需要）
    • 9.2.3. application.yml配置seata TC地址
    • 9.2.4. 添加全局事务注解
  • 9.3. 事务参与者
    • 9.3.1. 添加事务注解
• 10. 源码
  • 10.1. TC
  • 10.2. TM
  • 10.3. RM

1. 官网

https://seata.incubator.apache.org/zh-cn/

2. 下载地址

https://seata.incubator.apache.org/zh-cn/download/seata-server

3. server端安装

3.1. 默认端口-7091

3.2. 启动类型

• 有file、mysql、docker-compose、k8s

3.3. 说明事项

3.3.1. 业务系统和seata服务端之间的服务发现，可以是独立的

即订单掉库存，可以有8848的nacos管理；订单掉库存的全局事务，服务发现可以由8849管理；8849和8848不是集群；

4. application.yml

• 配置中心用nacos,注册中心用nacos,存储用mysql【示例】

#  Copyright 1999-2019 Seata.io Group.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

server:
  port: 7091

spring:
  application:
    name: seata-server

logging:
  config: classpath:logback-spring.xml
  file:
    path: ${log.home:${user.home}/logs/seata}
  extend:
    logstash-appender:
      destination: 127.0.0.1:4560
    kafka-appender:
      bootstrap-servers: 127.0.0.1:9092
      topic: logback_to_logstash

console:
  user:
    username: seata
    password: seata
seata:
  config:
    # support: nacos 、 consul 、 apollo 、 zk  、 etcd3
    type: nacos
    nacos:
      server-addr: tlmall-nacos-server:8848
      # 命名空间ID
      namespace: 6436dec5-8070-4e90-a4e6-9d9c1a71722a
      group: SEATA_GROUP
      username:
      password:
      context-path:
      ##if use MSE Nacos with auth, mutex with username/password attribute
      #access-key:
      #secret-key:
      # seataServer.properties的内容从"\seata\script\config-center\config.txt"
      data-id: seataServer.properties
  registry:
    # support: nacos 、 eureka 、 redis 、 zk  、 consul 、 etcd3 、 sofa
    type: nacos
    nacos:
      application: seata-server
      server-addr: tlmall-nacos-server:8848
      group: SEATA_GROUP
      # 命名空间ID
      namespace: 6436dec5-8070-4e90-a4e6-9d9c1a71722a
      # seata集群名(订单系统远程调用时要用)
      cluster: default
      
  store:
    # nacos上的seataServer.properties的模式优先级更高
    # support: file 、 db 、 redis 、 raft
    mode: file
  #  server:
  #    service-port: 8091 #If not configured, the default is '${server.port} + 1000'
  security:
    secretKey: SeataSecretKey0c382ef121d778043159209298fd40bf3850a017
    tokenValidityInMilliseconds: 1800000
    ignore:
      urls: /,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.jpeg,/**/*.ico,/api/v1/auth/login,/metadata/v1/**

4.1. nacos配置中心配置

• 效果图：
  

• data-id: seataServer.properties内容
  seataServer.properties的内容来自 "\seata\script\config-center\config.txt"

#For details about configuration items, see https://seata.io/zh-cn/docs/user/configurations.html
#Transport configuration, for client and server
transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableTmClientBatchSendRequest=false
transport.enableRmClientBatchSendRequest=true
transport.enableTcServerBatchSendResponse=false
transport.rpcRmRequestTimeout=30000
transport.rpcTmRequestTimeout=30000
transport.rpcTcRequestTimeout=30000
transport.threadFactory.bossThreadPrefix=NettyBoss
transport.threadFactory.workerThreadPrefix=NettyServerNIOWorker
transport.threadFactory.serverExecutorThreadPrefix=NettyServerBizHandler
transport.threadFactory.shareBossWorker=false
transport.threadFactory.clientSelectorThreadPrefix=NettyClientSelector
transport.threadFactory.clientSelectorThreadSize=1
transport.threadFactory.clientWorkerThreadPrefix=NettyClientWorkerThread
transport.threadFactory.bossThreadSize=1
transport.threadFactory.workerThreadSize=default
transport.shutdown.wait=3
transport.serialization=seata
transport.compressor=none

#Transaction routing rules configuration, only for the client
# default_tx_group 就是 业务系统application.yml中seata.tx-service-group的值
service.vgroupMapping.default_tx_group=default
#If you use a registry, you can ignore it
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false

client.metadataMaxAgeMs=30000
#Transaction rule configuration, only for the client
client.rm.asyncCommitBufferLimit=10000
client.rm.lock.retryInterval=10
client.rm.lock.retryTimes=30
client.rm.lock.retryPolicyBranchRollbackOnConflict=true
client.rm.reportRetryCount=5
client.rm.tableMetaCheckEnable=true
client.rm.tableMetaCheckerInterval=60000
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.sagaJsonParser=fastjson
client.rm.tccActionInterceptorOrder=-2147482648
client.rm.sqlParserType=druid
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
client.tm.interceptorOrder=-2147482648
client.undo.dataValidation=true
client.undo.logSerialization=jackson
client.undo.onlyCareUpdateColumns=true
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000
client.undo.logTable=undo_log
client.undo.compress.enable=true
client.undo.compress.type=zip
client.undo.compress.threshold=64k
#For TCC transaction mode
tcc.fence.logTableName=tcc_fence_log
tcc.fence.cleanPeriod=1h
# You can choose from the following options: fastjson, jackson, gson
tcc.contextJsonParserType=fastjson

#Log rule configuration, for client and server
log.exceptionRate=100

#Transaction storage configuration, only for the server. The file, db, and redis configuration values are optional.
store.mode=db
store.lock.mode=db
store.session.mode=db
#Used for password encryption
store.publicKey=

#These configurations are required if the `store mode` is `db`. If `store.mode,store.lock.mode,store.session.mode` are not equal to `db`, you can remove the configuration block.
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&nullCatalogMeansCurrent=true&rewriteBatchedStatements=true&characterEncoding=utf8
store.db.user=root
store.db.password=123456
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.distributedLockTable=distributed_lock
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000

#Transaction rule configuration, only for the server
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackRetryTimeoutUnlockEnable=false
server.distributedLockExpireTime=10000
server.session.branchAsyncQueueSize=5000
server.session.enableBranchAsyncRemove=false
server.enableParallelRequestHandle=true
server.enableParallelHandleBranch=false

#Metrics configuration, only for the server
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898

5. Server端注册中心

• 默认：file

• nacos方式

6. Server端配置中心

• 默认：file

7. 数据存储

• 默认：file

7.1. mysql方式

7.1.1. 初始化表

• sql文件所在位置：
  D:\Program\springCloud\seata-server-2.0.0\seata\script\server\db
• 建库，执行sql文件。

7.1.2. seata的服务application.yml也有同步调整

store.mode=db
store.lock.mode=db
store.session.mode=db

store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=123456

8. Server启动

• win
  双击 \seata\bin\seata-server.bat

9. 【AT】业务客户端如何连接SEATA 的TC

9.1. 总结

• AT模式
  谁发起（即要使用@GlobalTransactional，该应用则需要创建undo_log表）

9.2. 事务发起者

9.2.1. pom引入seata依赖

 <dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>

9.2.2. 创建UNDO_LOG 表（AT模式需要）

• github有
  

mysql引擎得支持事务

-- 注意此处为2.0.0
-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
    `branch_id`     BIGINT       NOT NULL COMMENT 'branch transaction id',
    `xid`           VARCHAR(128) NOT NULL COMMENT 'global transaction id',
    `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
    `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
    `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
    `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
    `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
    UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8mb4 COMMENT ='AT transaction mode undo table';
ALTER TABLE `undo_log` ADD INDEX `ix_log_created` (`log_created`);

9.2.3. application.yml配置seata TC地址

seata:
  # service.vgroupMapping.default_tx_group=default
  # seata 服务分组，要与服务端配置service.vgroup_mapping的后缀对应
  tx-service-group: default_tx_group
  registry:
    # 指定nacos作为注册中心
    type: nacos
    nacos:
      application: seata-server
      server-addr: tlmall-nacos-server:8848
      namespace: seata
      group: SEATA_GROUP

  config:
    # 指定nacos作为配置中心
    type: nacos
    nacos:
      server-addr: tlmall-nacos-server:8848
      namespace: seata
      group: SEATA_GROUP
      data-id: seataServer.properties

9.2.4. 添加全局事务注解

// name="createOrder" ---> global_table.transaction_name
@GlobalTransactional(name="createOrder",rollbackFor=Exception.class)

9.3. 事务参与者

• pom添加依赖，application.yml配置seata TC地址参照“事务发起者”

9.3.1. 添加事务注解

• 1：各服务的方法都需要添加本地事务注解
  @Transactional(rollbackFor=Exception.class)

10. 源码

10.1. TC

• SEATA服务端的类
  DefaultCoordinator

10.2. TM

• 微服务集成的客户端
  AT模式全局事务@GlobalTransactional发起协调者

10.3. RM

• 微服务集成的客户端