seata 1.5.2 保姆级教程

1. 第一步：下载所需软件
   需要用到nacos、seata、mysql，这里只讲解seata的。
   下载页面： http://seata.io/zh-cn/blog/download.html
   目前最新版本1.5.2，点击下载，或者直接点击链接：下载链接
   
   下载完解压后目录结构，主要有三个目录需要注意：bin、conf、lib
   bin:启动脚本所在目录
   conf:配置文件所在目录，在这里配置seata的启动信息
   lib:jar包所在的地方，里面有个jdbc目录，里面有两个不同版本的jar，默认是使用低版本的，如果后续步骤中报数据库驱动相关的错，可以过来把低版本的删掉。
   
2. 第二步：启动软件
   默认nacos已经配置好了，然后我们需要启动我们刚刚下的软件，也可以说是seata服务端，seata tc等。这个软件的作用是全局去管理事务，在需要回滚的时候通过netty去通知各服务进行回滚，具体原理后面在说，先把例子跑起来，爽一爽再说。
   启动有些配置需要填写
   下面这是conf目录下的application.yml

server:
  port: 7091

spring:
  application:
    name: seata-server

logging:
  config: classpath:logback-spring.xml
  file:
    path: ${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: 127.0.0.1:8848
      namespace: 613f563c-f58a-4624-b00e-3d5f9c5dc04e
      group: SEATA_GROUP
      username: nacos
      password: nacos
      data-id: seataServer.properties
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    type: nacos
    nacos:
      application: seata-server
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      namespace: 613f563c-f58a-4624-b00e-3d5f9c5dc04e
      cluster: default
      username: nacos
      password: nacos
#  store: #这个配置作用不大,因为上面在引入的nacos配置的时候,又会再引入一遍数据库的配置
#    # support: file 、 db 、 redis
#    mode: db
#    db:
#      datasource: druid
#      db-type: mysql
#      driver-class-name: com.mysql.cj.jdbc.Driver
#      url: jdbc:mysql://:3306/seata?rewriteBatchedStatements=true
#      user: root
#      password: weqfd4312
#      min-conn: 5
#      max-conn: 100
#      global-table: global_table
#      branch-table: branch_table
#      lock-table: lock_table
#      distributed-lock-table: distributed_lock
#      query-limit: 100
#      max-wait: 5000
  security:
    secretKey: SeataSecretKey0c382ef121d778043159209298fd40bf3850a017
    tokenValidityInMilliseconds: 1800000
    ignore:
      urls: /,/**/*.css,/**/*.js,/**/*.html,/**/*.map,/**/*.svg,/**/*.png,/**/*.ico,/console-fe/public/**,/api/v1/auth/login

然后nacos增加配置文件 Data Id：seataServer.properties Group：SEATA_GROUP

#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
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

#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.cj.jdbc.Driver
store.db.url=
store.db.user=
store.db.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

然后增加一个配置
Data Id：service.vgroupMapping.default_tx_group
Group：SEATA_GROUP
配置内容: default

3. 第三步：配置数据库的表
   还有一些表需要先建起来
   新建一个seata数据库，然后增加对应表：

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for branch_table
-- ----------------------------
DROP TABLE IF EXISTS `branch_table`;
CREATE TABLE `branch_table`  (
  `branch_id` bigint(0) NOT NULL,
  `xid` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
  `transaction_id` bigint(0) NULL DEFAULT NULL,
  `resource_group_id` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `branch_type` varchar(8) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `status` tinyint(0) NULL DEFAULT NULL,
  `client_id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `gmt_create` datetime(6) NULL DEFAULT NULL,
  `gmt_modified` datetime(6) NULL DEFAULT NULL,
  PRIMARY KEY (`branch_id`) USING BTREE,
  INDEX `idx_xid`(`xid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Table structure for distributed_lock
-- ----------------------------
DROP TABLE IF EXISTS `distributed_lock`;
CREATE TABLE `distributed_lock`  (
  `lock_key` char(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
  `lock_value` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
  `expire` bigint(0) NULL DEFAULT NULL,
  PRIMARY KEY (`lock_key`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Table structure for global_table
-- ----------------------------
DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table`  (
  `xid` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
  `transaction_id` bigint(0) NULL DEFAULT NULL,
  `status` tinyint(0) NOT NULL,
  `application_id` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `transaction_service_group` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `transaction_name` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `timeout` int(0) NULL DEFAULT NULL,
  `begin_time` bigint(0) NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `gmt_create` datetime(0) NULL DEFAULT NULL,
  `gmt_modified` datetime(0) NULL DEFAULT NULL,
  PRIMARY KEY (`xid`) USING BTREE,
  INDEX `idx_status_gmt_modified`(`status`, `gmt_modified`) USING BTREE,
  INDEX `idx_transaction_id`(`transaction_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Table structure for lock_table
-- ----------------------------
DROP TABLE IF EXISTS `lock_table`;
CREATE TABLE `lock_table`  (
  `row_key` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
  `xid` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `transaction_id` bigint(0) NULL DEFAULT NULL,
  `branch_id` bigint(0) NOT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `table_name` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `pk` varchar(36) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
  `status` tinyint(0) NOT NULL DEFAULT 0 COMMENT '0:locked ,1:rollbacking',
  `gmt_create` datetime(0) NULL DEFAULT NULL,
  `gmt_modified` datetime(0) NULL DEFAULT NULL,
  PRIMARY KEY (`row_key`) USING BTREE,
  INDEX `idx_status`(`status`) USING BTREE,
  INDEX `idx_branch_id`(`branch_id`) USING BTREE,
  INDEX `idx_xid`(`xid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

其他业务库里面需要建立undo_log表：

CREATE TABLE `undo_log` (
  `id` bigint NOT NULL AUTO_INCREMENT,
  `branch_id` bigint NOT NULL,
  `xid` varchar(100) NOT NULL,
  `context` varchar(128) NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb3;

4. 第四步：建项目操作了，这个不好写，直接上案例地址：https://github.com/huyy12321/seate-demo

5. 第五步：解决bug
   运行的时候难免会有些地方没注意到，从而导致失败，这里列举几种情况：

   Q:seata启动不起来，直接闪退。
   A:没启动起来肯定是配置文件有问题，没配好，仔细检查一下和上面的配置有什么不同。

   Q:打断点调试的时候发现undo_log表一直没记录
   A：seata.enable-auto-data-source-proxy配置没有开启。（多数据源的情况下是spring.datasource.dynamic.seata)

   Q:日志里打印xid发现没有值或不一样。
   A:如果是使用feign调用的情况下，需要引入seata-spring-boot-starter