seata 使用oracle_Seata的简单使用
Seata的簡單使用
本文只介紹Seata的簡單使用,沒有涉及其原理.
1.在本地搭建一個TC服務(事務協調者).
1.1 下載seata的安裝包
往下滑滑,找到你想要的版本和格式下載即可.我這里使用的是seata-server-1.1.0.zip,解壓即可使用.
1.2 配置
打開解壓目錄下的conf/registry.conf文件如下
registry {
# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
# 可以把seata-server理解為一個服務,它需要把自己注冊到某個注冊中心上去,方便使用seata的服務來找到自己
#在這里就是指定注冊中心的類型,由于我們項目用的是eureka,所以這里我選擇eureka,即這一堆配置就下面一個eureka生效了
#這里默認的是file,即文件,選了文件就可以不用搭注冊中心,直接從文件里讀取服務列表
#復制之后一定要改一改
type = "eureka"
nacos {
serverAddr = "localhost"
namespace = ""
cluster = "default"
}
eureka { #"只有我生效啦"
serviceUrl = "http://localhost:10086/eureka" #eureka地址
application = "seata_tc_server"#在eureka里顯示的名字
weight = "1"
}
redis {
serverAddr = "localhost:6379"
db = "0"
}
zk {
cluster = "default"
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
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 {
#在這里選擇配置中心,這里我們選擇file
# file、nacos 、apollo、zk、consul、etcd3
type = "file"
nacos {
serverAddr = "localhost"
namespace = ""
group = "SEATA_GROUP"
}
consul {
serverAddr = "127.0.0.1:8500"
}
apollo {
app.id = "seata-server"
apollo.meta = "http://192.168.1.204:8801"
namespace = "application"
}
zk {
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
etcd3 {
serverAddr = "http://localhost:2379"
}
file {
#由于選擇了file,所以這里生效了
name = "file.conf"
}
}
所以接下來看一下file.conf文件
## transaction log store, only used in seata-server
store {
## store mode: file、db
#選擇配置中心的存儲模式,由于選擇file存到文件里(性能高)會變為二進制流不好觀察,所以選擇數據庫
#復制之后一定要改一改
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 {
#選擇了數據庫必定要做出一些配置,數據庫里一定要有這3張表
## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
datasource = "dbcp"
## mysql/oracle/h2/oceanbase etc.
dbType = "mysql"
driverClassName = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://192.168.206.99:3306/seata"
user = "root"
password = "root"
minConn = 1
maxConn = 10
globalTable = "global_table"
branchTable = "branch_table"
lockTable = "lock_table"
queryLimit = 100
}
}
建表SQL如下:
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=InnoDBDEFAULT 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,
`gmt_modified`DATETIME,PRIMARY KEY(`branch_id`),KEY`idx_xid` (`xid`)
) ENGINE=InnoDBDEFAULT 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=InnoDBDEFAULT CHARSET = utf8;
1.3 啟動
如果是linux環境(要有JRE)，執行seata-server.sh
如果是windows環境，執行seata-server.bat
2 改造微服務
只要是需要用到seata(分布式事務)的服務,都要做類似的配置.
2.1 引入依賴
我這里是springboot項目,所以我先在父pom中聲明了.如下
2.1.0.RELEASE
1.1.0
com.alibaba.cloud
spring-cloud-alibaba-seata
${alibaba.seata.version}
seata-all
io.seata
seata-all
io.seata
${seata.version}
接下來只要在需要seata的微服務里添加依賴就好了.
com.alibaba.cloud
spring-cloud-alibaba-seata
io.seata
seata-all
2.2 添加配置
spring:
cloud:
alibaba:
seata:
tx-service-group: test_tx_group # 定義事務組的名稱
2.3 在resources目錄下添加2個文件file.conf和registry.conf
registry.conf和前面的一樣,直接復制過來就好.
file.conf里的內容不同了,新的內容如下:
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 {
#這里注意,等號前后都是配置,前面是yml里配置的事務組,后面是register.conf里定義的seata-server
vgroupMapping.test_tx_group = "seata_tc_server"
#only support when registry.type=file, please don't set multiple addresses
seata_tc_server.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
}
}
配置解讀：
transport：與TC交互的一些配置
heartbeat：client和server通信心跳檢測開關
enableClientBatchSendRequest：客戶端事務消息請求是否批量合并發送
service：TC的地址配置，用于獲取TC的地址
vgroupMapping.test_tx_group = "seata_tc_server"：
test_tx_group：是事務組名稱，要與application.yml中配置一致，
seata_tc_server：是TC服務端集群的名稱，將來通過注冊中心獲取TC地址
enableDegrade：服務降級開關，默認關閉。如果開啟，當業務重試多次失敗后會放棄全局事務
disableGlobalTransaction：全局事務開關，默認false。false為開啟，true為關閉
default.grouplist：這個當注冊中心為file的時候，才用到
client：客戶端配置
rm：資源管理器配
asynCommitBufferLimit：二階段提交默認是異步執行，這里指定異步隊列的大小
lock：全局鎖配置
retryInterval：校驗或占用全局鎖重試間隔，默認10，單位毫秒
retryTimes：校驗或占用全局鎖重試次數，默認30次
retryPolicyBranchRollbackOnConflict：分支事務與其它全局回滾事務沖突時鎖策略，默認true，優先釋放本地鎖讓回滾成功
reportRetryCount：一階段結果上報TC失敗后重試次數，默認5次
tm：事務管理器配置
commitRetryCount：一階段全局提交結果上報TC重試次數，默認1
rollbackRetryCount：一階段全局回滾結果上報TC重試次數，默認1
undo：undo_log的配置
dataValidation：是否開啟二階段回滾鏡像校驗，默認true
logSerialization：undo序列化方式，默認Jackson
logTable：自定義undo表名，默認是undo_log
log：日志配置
exceptionRate：出現回滾異常時的日志記錄頻率，默認100，百分之一概率。回滾失敗基本是臟數據，無需輸出堆棧占用硬盤空間
2.4 代理DataSource
由于在一階段是通過攔截sql分析語義來生成回滾策略,原來的數據源已經不夠用了,得換個牛逼的.在服務里新建一個配置類.
如果是使用的是mybatis
importio.seata.rm.datasource.DataSourceProxy;importorg.apache.ibatis.session.SqlSessionFactory;importorg.mybatis.spring.SqlSessionFactoryBean;importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.Configuration;importjavax.sql.DataSource;
@Configurationpublic classDataSourceProxyConfig {
@Beanpublic SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource) throwsException {//因為使用的是mybatis，這里定義SqlSessionFactoryBean
SqlSessionFactoryBean sqlSessionFactoryBean = newSqlSessionFactoryBean();//配置數據源代理
sqlSessionFactoryBean.setDataSource(newDataSourceProxy(dataSource));returnsqlSessionFactoryBean.getObject();
}
}
如果使用的是mybatis-plus
importcom.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;importio.seata.rm.datasource.DataSourceProxy;importorg.apache.ibatis.session.SqlSessionFactory;importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.Configuration;importjavax.sql.DataSource;
@Configurationpublic classDataSourceProxyConfig {
@Beanpublic SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource) throwsException {//訂單服務中引入了mybatis-plus，所以要使用特殊的SqlSessionFactoryBean
MybatisSqlSessionFactoryBean sqlSessionFactoryBean = newMybatisSqlSessionFactoryBean();//代理數據源
sqlSessionFactoryBean.setDataSource(newDataSourceProxy(dataSource));//生成SqlSessionFactory
returnsqlSessionFactoryBean.getObject();
}
}
2.5 加上注解
給事務發起者的方法上加上@GlobalTransactional即可,其它的參與者只要加@Transactional就好了.
3.踩坑記錄
1.由于更換了數據源,不知道為什么我在yml里給mybatis配置的駝峰映射失效了,導致我查到的數據缺少了某些字段.不知道這個問題在mybatis-plus中會不會出現.
解決辦法:單獨給數據源配置映射規則就好了.所以我把上面的配置類加了一個設置,修改后的代碼如下.
importio.seata.rm.datasource.DataSourceProxy;importorg.apache.ibatis.session.SqlSessionFactory;importorg.mybatis.spring.SqlSessionFactoryBean;importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.Configuration;importjavax.sql.DataSource;
@Configurationpublic classDataSourceProxyConfig {
@Beanpublic SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource) throwsException {//因為使用的是mybatis，這里定義SqlSessionFactoryBean
SqlSessionFactoryBean sqlSessionFactoryBean = newSqlSessionFactoryBean();//配置數據源代理
sqlSessionFactoryBean.setDataSource(newDataSourceProxy(dataSource));
SqlSessionFactory object=sqlSessionFactoryBean.getObject();assert object != null;
// 單獨給數據源設置駝峰映射
object.getConfiguration().setMapUnderscoreToCamelCase(true);returnobject;
}
}
總結
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