【nacos集成Seata】_nacos seata

Nacos集成Seata

Seata官方文档
版本:
nacos1.4.2
seata1.4.2

一、Seata核心组件

• Transaction Coordinator(TC，事务协调器)
  维护全局事务和分支事务的状态，驱动全局事务提交或回滚。
• Transaction Manager(TM，事务管理器)
  定义全局事务的范围，开始事务、提交事务、回滚事务。
• Resource Manager(RM，资源管理器)
  管理分支事务上的资源，向TC注册分支事务，汇报分支事务状态，驱动分支事务的提交或回滚。

二、seata四种模式

1、AT 模式

前提

基于支持本地 ACID 事务的关系型数据库。
Java 应用，通过 JDBC 访问数据库。

整体机制

两阶段提交协议的演变：

一阶段：业务数据和回滚日志记录在同一个本地事务中提交，释放本地锁和连接资源。

二阶段：

提交异步化，非常快速地完成。
回滚通过一阶段的回滚日志进行反向补偿。

AT模式的特点就是对业务无入侵式， 只需要为方法添加@GlobalTransactional注解即可。
整体机制分二阶段提交 ，对应我们分布式事务解决方案中的2PC（2阶段提交）方案

二阶段主要有两种模式，分别是事务提交和事务回滚。事务提交主要是指一阶段没有出现错误或异常，事务可以提交；而事务回滚则是一阶段出现了异常，通过一阶段的回滚日志来对事务进行回滚。

2、TCC 模式

详见官方文档
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3、Saga 模式

详见官方文档
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4、XA 模式

详见官方文档
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三、下载解压Seata

链接：https://pan.baidu.com/s/1_YTH_jgHrnGkYbcoKkMsrA
提取码：aymj

四、配置相关文件

1.进去conf目录下, 编辑file.conf

• 此处选择数据库DB作为seata-server日志存储

• 更改自己的数据库链接

• 更改自己的数据库账号密码

• 使用 DB 存储模式时，需要注意使用相应seata-server对应版本的建表脚本，建表脚本获取地址：https://github.com/seata/seata/tree/${版本}/script/server/db，例如：获取seata-server 1.5.0 对应的建表脚本，可从此地址获取 https://github.com/seata/seata/tree/1.5.0/script/server/db 升级 seata-server 前需要先变更表结构。

• seata-server 依赖的后端的DB，不要开启读写分离。开启读写分离后根据同步模式的不同延迟也有所不同，seata-server 为无状态计算节点，所有状态都需要到DB存储中校验，在主从同步延迟较大的情况下会导致读取的状态不准确从而导致事务逻辑处理问题。为了更高的读写性能，DB可将隔离级别设置为读已提交。

store {
  ## store mode: file、db、redis
  ## 这里选择数据库作为seata-server日志存储
  mode = "db"  #

  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }

  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata"
    user = "mysql"
    password = "mysql"
    minConn = 5
    maxConn = 100
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }

  ## redis store property
  redis {
    host = "127.0.0.1"
    port = "6379"
    password = ""
    database = "0"
    minConn = 1
    maxConn = 10
    maxTotal = 100
    queryLimit = 100
  }

}


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2. 创建本地数据库Seata

-- -------------------------------- The script used when storeMode is 'db' --------------------------------
-- 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_gmt_modified_status` (`gmt_modified`, `status`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

-- 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 = utf8;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(96),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

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还有你的业务数据库创建undo_log表

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for undo_log
-- ----------------------------
DROP TABLE IF EXISTS `undo_log`;
CREATE TABLE `undo_log`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `context` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime(0) NOT NULL,
  `log_modified` datetime(0) NOT NULL,
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE INDEX `ux_undo_log`(`xid`, `branch_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 21 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;
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3. 配置客户端配置文件

 打开conf目录下的registry.conf
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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 = ""
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }


// 省略其他


config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "nacos"

  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
	dataId = "seata-server.properties"
  }


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4. 启动nacos 开始配置

1. nacos 新建seata配置, 名称为我们上边指定的dataId

https://github.com/seata/seata/tree/develop/script/config-center

重点: 重点: 重点:

client 的配置 一定要和 server 的配置一致
事务分组, 要根据你的微服务命名, 值就是默认值
例: service.vgroupMapping.时光的平博_tx_group=default (此处中文是举例, 认真你就输了)

把文件拷贝到seata-server.properties中作为配置

• 修改数据库链接
• 修改存储方式为DB
• service.default.grouplist=10.92.9.190:8091 这里修改最好不要127
• service.vgroupMapping.XXXXXX_tx_group=default (XXXXXX改成你的application.name的名字)

#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

#注意这里改成你项目中的名称
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

#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.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.sagaJsonParser=fastjson
client.rm.tccActionInterceptorOrder=-2147482648
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

#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=

#If `store.mode,store.lock.mode,store.session.mode` are not equal to `file`, you can remove the configuration block.
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

#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?useUnicode=true&rewriteBatchedStatements=true
store.db.user=username
store.db.password=password
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.xaerNotaRetryTimeout=60000
server.session.branchAsyncQueueSize=5000
server.session.enableBranchAsyncRemove=false
server.enableParallelRequestHandle=false

#Metrics configuration, only for the server
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898
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2. 对应的nacos服务中增加seata配置

客户端服务端一定要一致

seata:
  enabled: true
  application-id: 你的spring.name的名字
  tx-service-group: 你的spring.name的名字_tx_group
  enable-auto-data-source-proxy: true # 开启数据源自动代理
  config:
    type: nacos
    nacos:
      namespace: ""
      serverAddr: 10.92.9.190:8848
      group: SEATA_GROUP
      data-id: seata-server.properties
  registry:
    type: nacos
    nacos:
      namespace: ""
      application: seata-server
      server-addr: 10.92.9.190:8848
      username: nacos
      password: nacos
  service:
    vgroup-mapping:
      #对应nacos配置 service.vgroupMapping.my_test_tx_group 的值 default
     # 你的spring.name的名字_tx_group = default
      my_test_tx_group: default

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五、配置IDEA

1. 导入相关依赖

	根据官方描述, 我们在nacos开启了自动代理, 在依赖导入时, 排除相关依赖
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<!--seata 分布式事务依赖-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-seata</artifactId>
            <!--            <version>2021.1</version>-->
            <version>2.2.0.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>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.4.2</version>
        </dependency>
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2. yml配置

spring:
	cloud:
		alibaba:
	      seata:
	        tx-service-group: ${spring.application.name}_tx_group
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六、 启动seata

nacos看服务是否成功注册
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七、 启动Demo