foreword

Seata Deployment Guide

Seata is an open source distributed transaction solution dedicated to providing high-performance and easy-to-use distributed transaction services. Seata will provide users with AT, TCC, SAGA and XA transaction modes to create a one-stop distributed solution for users.

1. The execution process of Seata is as follows

TM [transaction initiator] of service A [order micro-service] applies to TC [seata server] to open a global transaction, and TC will create a global transaction and return a unique XID

Service A starts to call service B [account microservice] remotely, at this time XID will be propagated on the call chain of microservice

The RM of service B registers the branch transaction with TC and brings it into the jurisdiction of the global transaction corresponding to XID

Service B executes branch transactions and performs operations on the database

After the global transaction call chain is processed, TM initiates a global transaction commit or rollback to TC according to whether there is an exception

TC coordinates all branch transactions under its jurisdiction and decides whether to roll back

TM: transaction initiator [on which method the global transaction annotation is added]

TC : transaction manager [seata's server]

RM: each microservice that operates the database

XID: global transaction id

2. Use steps

(1) Download seata1.3.0 --->

Support cluster mode and download the source code of the open source project

Modify conf/file.conf so that the seata cluster information can be shared, we should modify its storage location:

Specify the registration center address of seata and the content of the configuration center

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

  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = "88aa134e-24e9-45ab-a336-6ba2ce63a913"
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    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"
  }
  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 = "nacos"

  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = "88aa134e-24e9-45ab-a336-6ba2ce63a913"
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    appId = "seata-server"
    apolloMeta = "http://192.168.1.204:8801"
    namespace = "application"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

Then

3. Configure the microservice client

Add seata dependency in each microservice

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

Modify the configuration file

Finally, add a global transaction as tm in the required business layer

@GlobalTransactional //全局事务 tm队长 全局事务
回滚其他微服务连接数据库。
    public void saveOrder(Order order) {

 log.info("-------->开始创建新订单");
        orderDao.saveOrder(order);

        log.info("-------订单微服务开始调用账户，做扣减");
        accountFeign.increase(order.getUserId(),order.getMoney()); //事务提交
        log.info("-------订单微服务开始调用账户，做扣减end");
        int c=10/0;
        log.info("--------订单微服务开始调用库存,做扣减");
        storageFeign.increase(order.getProductId(),order.getCount());
        log.info("-------订单微服务开始调用库存，做扣减end");


        log.info("-------修改订单状态");
        orderDao.updateStatus(order.getId());

        log.info("-------修改订单状态结束");

        log.info("--------下订单结束了，哈哈哈哈");



}

Summarize

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Use seata to solve distributed transactions

Article directory

foreword

1. The execution process of Seata is as follows

2. Use steps

3. Configure the microservice client

Summarize

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