分布式事务 SEATA-1.4.1 AT模式 配合NACOS 应用

SEATA 配置

目录

• SEATA 配置
  • TC (Transaction Coordinator) - 事务协调者
    • 配置参数
    • nacos bash 脚本
    • 同步 config 配置到 nacos
    • 使用 docker 部署 SEATA
  • TM (Transaction Manager) - 事务管理器
    • RM (Resource Manager) - 资源管理器

使用 nacos 做为配置中心配置 SEATA

当前 SEATA 版本： 1.4.1

TC (Transaction Coordinator) - 事务协调者

维护全局和分支事务的状态，驱动全局事务提交或回滚。

配置参数

参数文档

config.txt

transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableClientBatchSendRequest=false
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
service.vgroupMapping.app-server-tx-group=default
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false
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=false
client.rm.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
store.mode=db
store.file.dir=file_store/data
store.file.maxBranchSessionSize=16384
store.file.maxGlobalSessionSize=512
store.file.fileWriteBufferCacheSize=16384
store.file.flushDiskMode=async
store.file.sessionReloadReadSize=100
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=url
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.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000
store.redis.host=127.0.0.1
store.redis.port=6379
store.redis.maxConn=10
store.redis.minConn=1
store.redis.database=10
store.redis.password=null
store.redis.queryLimit=100
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
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.log.exceptionRate=100
transport.serialization=seata
transport.compressor=none
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898

nacos bash 脚本

参考 SEATA github 配置说明

nacos-config.sh

while getopts ":h:p:g:t:u:w:" opt
do
  case $opt in
  h)
    host=$OPTARG
    ;;
  p)
    port=$OPTARG
    ;;
  g)
    group=$OPTARG
    ;;
  t)
    tenant=$OPTARG
    ;;
  u)
    username=$OPTARG
    ;;
  w)
    password=$OPTARG
    ;;
  ?)
    echo " USAGE OPTION: $0 [-h host] [-p port] [-g group] [-t tenant] [-u username] [-w password] "
    exit 1
    ;;
  esac
done
if [[ -z ${host} ]]; then
    host=localhost
fi
if [[ -z ${port} ]]; then
    port=8848
fi
if [[ -z ${group} ]]; then
    group="SEATA_GROUP"
fi
if [[ -z ${tenant} ]]; then
    tenant=""
fi
if [[ -z ${username} ]]; then
    username=""
fi
if [[ -z ${password} ]]; then
    password=""
fi
nacosAddr=$host:$port
contentType="content-type:application/json;charset=UTF-8"
echo "set nacosAddr=$nacosAddr"
echo "set group=$group"
failCount=0
tempLog=$(mktemp -u)
function addConfig() {
  curl -X POST -H "${contentType}" "http://$nacosAddr/nacos/v1/cs/configs?dataId=$1&group=$group&content=$2&tenant=$tenant&username=$username&password=$password" >"${tempLog}" 2>/dev/null
  if [[ -z $(cat "${tempLog}") ]]; then
    echo " Please check the cluster status. "
    exit 1
  fi
  if [[ $(cat "${tempLog}") =~ "true" ]]; then
    echo "Set $1=$2 successfully "
  else
    echo "Set $1=$2 failure "
    (( failCount++ ))
  fi
}
count=0
for line in $(cat config.txt | sed s/[[:space:]]//g); do
  (( count++ ))
	key=${line%%=*}
    value=${line#*=}
	addConfig "${key}" "${value}"
done
echo "========================================================================="
echo " Complete initialization parameters,  total-count:$count ,  failure-count:$failCount "
echo "========================================================================="
if [[ ${failCount} -eq 0 ]]; then
	echo " Init nacos config finished, please start seata-server. "
else
	echo " init nacos config fail. "
fi

同步 config 配置到 nacos

进入 TC 服务器

• 新建文件夹 seata-config

• 进入 seata-config

• 新建 config.txt 文件并复制配置参数到 config.txt 文件中

• 新建 nacos-config.sh 文件，同时复制 nacos bash 脚本到 nacos-config.sh 中

• 使用以下命令同步配置参数到 nacos

  bash nacos-config.sh -h 127.0.0.1 -p 8848 -g SEATA_GROUP -t 3a2aea46-07c6-4e21-9a1e-8946cde9e2b3 -u nacos -w nacos
  

  得到输出

  set nacosAddr=127.0.0.1:8848
  set group=SEATA_GROUP
  Set transport.type=TCP successfully
  Set transport.server=NIO successfully
  .
  .
  .
  =========================================================================
  Complete initialization parameters,  total-count:80 ,  failure-count:0
  =========================================================================
  Init nacos config finished, please start seata-server.
  

使用 docker 部署 SEATA

Docker 部署 SEATA 官方文档

进入 TC 服务器，并进入 seat-config 文件夹

• 新建 registry.conf 文件，并添加以下内容，registry 配置参考

  registry.conf

  registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  nacos {
      application = "seata-server"
      group = "SEATA_GROUP"
      serverAddr = "127.0.0.1"
      namespace = "3a2aea46-07c6-4e21-9a1e-8946cde9e2b3"
      cluster = "default"
  }
  }
  config {
  # file、nacos 、apollo、zk、consul、etcd3、springCloudConfig
  type = "nacos"
  nacos {
      serverAddr = "127.0.0.1"
      namespace = "3a2aea46-07c6-4e21-9a1e-8946cde9e2b3"
      group = "SEATA_GROUP"
      username = "nacos"
      password = "nacos"
  }
  }
  

• 新建 file.conf 文件并添加以下内容（可选，可通过 nacos 读取）

  file.conf

  transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  # the client batch send request enable
  enableClientBatchSendRequest = true
  #thread factory for netty
  threadFactory {
      bossThreadPrefix = "NettyBoss"
      workerThreadPrefix = "NettyServerNIOWorker"
      serverExecutorThread-prefix = "NettyServerBizHandler"
      shareBossWorker = false
      clientSelectorThreadPrefix = "NettyClientSelector"
      clientSelectorThreadSize = 1
      clientWorkerThreadPrefix = "NettyClientWorkerThread"
      # netty boss thread size,will not be used for UDT
      bossThreadSize = 1
      #auto default pin or 8
      workerThreadSize = "default"
  }
  shutdown {
      # when destroy server, wait seconds
      wait = 3
  }
  serialization = "seata"
  compressor = "none"
  }
  service {
  #transaction service group mapping
  vgroupMapping.my_test_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
  }
  client {
  rm {
      asyncCommitBufferLimit = 10000
      lock {
      retryInterval = 10
      retryTimes = 30
      retryPolicyBranchRollbackOnConflict = true
      }
      reportRetryCount = 5
      tableMetaCheckEnable = false
      reportSuccessEnable = false
  }
  tm {
      commitRetryCount = 5
      rollbackRetryCount = 5
  }
  undo {
      dataValidation = true
      logSerialization = "jackson"
      logTable = "undo_log"
  }
  log {
      exceptionRate = 100
  }
  }
  

• 运行 docker 命令

  • 注意： 当在 config.txt 中配置 store.mode=db 时，需要在配置的数据库连接中初始化表 global_table、branch_table、lock_table，sql 传送门。

  docker run -d --name seata-server \
        --net=host \
        -p 8091:8091 \
        -e SEATA_CONFIG_NAME=file:/root/seata-config/registry \
        -v /root/seata-config:/root/seata-config  \
        seataio/seata-server:1.4.1
  

  挂载目录为 TC 服务器配置目录。

TM (Transaction Manager) - 事务管理器

定义全局事务的范围：开始全局事务、提交或回滚全局事务。

例子：业务聚合服务

• SEATA 包引入。pom 配置如下，当使用 spring-cloud-starter-openfeign 包时，需要移除 spring-cloud-starter-openfeign 包，spring-cloud-starter-alibaba-seata 中已经包含了 spring-cloud-starter-openfeign ,再次引入可能导致包冲突。

  pom.xml

  <dependency>
      <groupId>io.seata</groupId>
      <artifactId>seata-spring-boot-starter</artifactId>
      <version>1.4.1</version>
  </dependency>
  <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
      <version>2.2.1.RELEASE</version>
      <exclusions>
          <exclusion>
              <groupId>io.seata</groupId>
              <artifactId>seata-spring-boot-starter</artifactId>
          </exclusion>
          <exclusion>
              <groupId>io.seata</groupId>
              <artifactId>seata-all</artifactId>
          </exclusion>
      </exclusions>
  </dependency>
  

• 添加 registry.conf。在工程中 resource 目录下添加如下内容

  registry.conf

  registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  nacos {
      application = "seata-server"
      serverAddr = "127.0.0.1:8848"
      namespace = "3a2aea46-07c6-4e21-9a1e-8946cde9e2b3"
      cluster = "default"
      username = "nacos"
      password = "nacos"
  }
  }
  config {
  # file、nacos 、apollo、zk、consul、etcd3、springCloudConfig
  type = "nacos"
  nacos {
      serverAddr = "127.0.0.1:8848"
      namespace = "3a2aea46-07c6-4e21-9a1e-8946cde9e2b3"
      group = "SEATA_GROUP"
      username = "nacos"
      password = "nacos"
  }
  }
  

• 配置 bootstrap.properties，添加配置,内容如下，seata.tx-service-group 和 namespace 改为对应的值

  bootstrap.properties

    ...
    seata.tx-service-group=app-server-tx-group
    seata.config.type=nacos
    seata.config.nacos.server-addr=127.0.0.1:8848
    seata.config.nacos.namespace=3a2aea46-07c6-4e21-9a1e-8946cde9e2b3
    seata.config.nacos.group=SEATA_GROUP
  

在 TM 中通过 @GlobalTransactional 开启全局异常，示例代码:

    @GlobalTransactional
    @GetMapping({"create"})
    public String create(String name,Integer age) {
        ...
        return "创建成功";
    }

RM (Resource Manager) - 资源管理器

管理分支事务处理的资源，与TC交谈以注册分支事务和报告分支事务的状态，并驱动分支事务提交或回滚。

例子：被调用服务。

• 配置 bootstrap.properties，添加配置,内容如下，seata.tx-service-group 和 namespace 改为对应的值

  bootstrap.properties

    ...
    seata.tx-service-group=app-server-tx-group
    seata.config.type=nacos
    seata.config.nacos.server-addr=127.0.0.1:8848
    seata.config.nacos.namespace=3a2aea46-07c6-4e21-9a1e-8946cde9e2b3
    seata.config.nacos.group=SEATA_GROUP
  

• 对需要做回滚的业务标记 @Transactional(rollbackFor = Exception.class)

• 如果配置了全局异常处理，使用 SEATA API 发起事务回滚

    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public String exceptionHandler(Exception e) {
        ...
        try {
            String xid = RootContext.getXID();
            if (StringUtils.isNotEmpty(xid)) {
                GlobalTransactionContext.reload(RootContext.getXID()).rollback();
            }
        } catch (TransactionException transactionException) {
            transactionException.printStackTrace();
            log.error("===TransactionException==={}", transactionException.getMessage());
        }
        return e.getMessage();
    }
  

  或者通过 AOP 全局处理回滚

  
  /**
  * @author Zhang_Xiang
  * @since 2021/2/22 17:36:16
  */
  @Aspect
  @Component
  @Slf4j
  public class TxAspect {
      @Pointcut("execution(public * *(..))")
      public void publicMethod() {
      }
      @Pointcut("within(com.*.service.impl..*)")
      private void services() {
      }
      @Pointcut("@annotation(org.springframework.transaction.annotation.Transactional)")
      private void transactional() {
      }
      @Pointcut("within(com.*.webapi.controller..*)")
      private void actions() {
      }
      @Pointcut("@annotation(org.springframework.web.bind.annotation.ExceptionHandler))")
      private void validatedException() {
      }
      @Before(value = "validatedException()")
      public void beforeValidate(JoinPoint joinPoint) throws TransactionException {
          Object[] args = joinPoint.getArgs();
          if (args == null || args.length == 0) {
              return;
          }
          Exception e = (Exception) args[0];
          if (e instanceof MethodArgumentNotValidException || e instanceof BindException || e instanceof
                  ConstraintViolationException) {
              globalRollback();
          }
      }
      @AfterThrowing(throwing = "e", pointcut = "publicMethod()&&services()&&transactional()")
      public void doRecoveryMethods(Throwable e) throws TransactionException {
          log.info("===method throw===:{}", e.getMessage());
          globalRollback();
      }
      @AfterReturning(value = "publicMethod()&&actions()", returning = "result")
      public void afterReturning(RestResponse<?> result) throws TransactionException {
          log.info("===method finished===:{}", result);
          if (result.isFail()) {
              globalRollback();
          }
      }
      //region private methods
      private void globalRollback() throws TransactionException {
          if (!StringUtils.isBlank(RootContext.getXID())) {
              log.info("===xid===:{}", RootContext.getXID());
              GlobalTransactionContext.reload(RootContext.getXID()).rollback();
          }
      }
      //endregion
  }