分布式事务 SEATA-1.4.1 AT模式 配合NACOS 应用

SEATA 配置

目录

    • TC (Transaction Coordinator) – 事务协调者

      • 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
    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
    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
    }
博客园精华区
我还没有学会写个人说明!
上一篇

美一只白尾鹿死亡并被发现患有“多毛眼球”疾病

下一篇

“伴侣想要而我不想要时,怎么办?”

你也可能喜欢

评论已经被关闭。

插入图片