seata服务搭建

它支持两种存储模式，一个是文件，一个是数据库，下面我们分别介绍一下这两种

配置nacos存储配置，注意如果registry.conf中注册和配置使用的是file，就会去读取file.config的配置，如果是nacos则通过nacos动态读取配置

用nacos作为注册中心了，所以我们接下来要做的就是讲配置上传到nacos进行存储

首先我们需要去官网下载Seata的源码，找到其中的script目录：

https://gitcode.net/mirrors/seata/seata

script的目录结构是这样的：

• client：存放客户端SQL脚本的，参数配置

• config-center：各个配置中心参数导入脚本，config.txt为通用参数文件

• server：服务端数据库脚本及各个容器配置

进入config-center/nacos目录，执行脚本，添加nacos配置信息(不要忘记开启nacos服务哦)，命令如下：

ps:下载完成后，将脚本文件放入到seata项目的配置文件夹下（seata-server-1.4.2\conf）：

ps: 需要导入nacos的配置信息文件config.txt需要放在config的上一层目录

ps: 存储模式改成 store.mode=db ，因为我使用的是mysql8.0.17版本的，所以 store.db.driverClassName=com.mysql.cj.jdbc.Driver，需要另外下载jdbc的jar包，下载好后放入项目中seata-server-1.4.2\lib\jdbc的目录下：

剩下的就是配置数据库的相关配置信息（url、username、password）：

store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai

store.db.user=root

store.db.password=123456

//执行脚本
sh ${SEATAPATH}/bin/nacos-config.sh -h localhost -p 8848 -g SEATA_GROUP -t 5a3c7d6c-f497-4d68-a71a-2e5e3340b3ca -u nacos-w nacos
Parameter Description:

-h: host, the default value is localhost.

-p: port, the default value is 8848.

-g: Configure grouping, the default value is 'SEATA_GROUP'.

-t: Tenant information, corresponding to the namespace ID field of Nacos, the default value is ''.

-u: username, nacos 1.2.0+ on permission control, the default value is ''.

-w: password, nacos 1.2.0+ on permission control, the default value is ''.

让我们看一下nacos那边的配置列表是否有对应的配置数据了：

很显然，已经添加成功了 ，那接下来我们就需要修改一下Seata服务端配置加载位置，那就需要修改registry.conf文件中的config那段配置，配置如下：

 config {# file、nacos 、apollo、zk、consul、etcd3type = "nacos"    #修改nacos {serverAddr = "127.0.0.1:8848"    #修改namespace = ""group = "SEATA_GROUP" #跟上面的-g 命令保持一致即可}#以下代码省略...
}

1、存储模式

1、file存储模式
默认支持的存储模式，直接启动即可，不需要改动任何文件，file模式是单机模式，全局事务会话信息会持久化到本地文件：/bin/sessionStore/root.data，性能较高，具体的命令如下：

sh seata-server.sh -p 8091 -h 127.0.0.1 -m file
2、db存储模式
这个模式是高可用的模式，全局事务会话信息通过db共享的，性能较比file模式较差一些，具体的实现步骤如下：

①创建数据库，表结构如下：

-- the table to store GlobalSession data
--全局事务表
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
--分支事务表
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
--全局锁表
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;
②设置事务日志存储方式

进入conf/file.conf，修改属性store.mode="db"

③修改数据库连接

db {
datasource = "druid" ##修改
dbType = "mysql"
driverClassName = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://127.0.0.1:3306/seata" ##修改
user = "mysql" ##修改
password = "mysql" ##修改
minConn = 1
maxConn = 10
globalTable = "global_table"
branchTable = "branch_table"
lockTable = "lock_table"
queryLimit = 100
}
④启动seata

seata-server.bat -h 127.0.0.1 -p 8091 -m db -n 1
关于后面的启动参数这里就不做陈述了，上面表格有详解

2、配置中心说明

Seata根目录config有两个配置文件，registry.conf和file.config

registry.con配置说明

这个文件中只包含了两项配置属相：registry和config，源码如下：

registry {

# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa

type = "file"

nacos {

serverAddr = "localhost"

namespace = ""

cluster = "default"

}

eureka {

serviceUrl = "http://localhost:8761/eureka"

application = "default"

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 {

# 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 {

name = "file.conf"

}

}

registry

它可以配置Seata服务注册的地址，支持现在市面上绝大多数的注册中心组件，配置也很简单，只需要修改type即可，然后在对应的配置下，配置好对应服务的ip相关信息即可，比如想用Nacos作为注册中心，那就type=nacos，然后修改ip，源码如下：

registry {

# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa

type = "nacos" #修改，按照上面注释的单词来填写

nacos {

serverAddr = "127.0.0.1:8848" #对应nacos的相关配置

namespace = ""

cluster = "default"

}

# 以下代码省略...

}

这里注意一下，这个type默认是file，表示不用注册中心，如果是file，就可以不用注册中心快速运行Seata，只不过file没有注册中心的动态发现和动态配置的功能

config

用于配置Seata服务端的配置文件地址，意思就是说可以通过config配置来指定Seata服务端的配置信息的加载位置，它支持从远程配置中心读取和本地文件读取两种方式，如果配置为远程配置中心，可以使用type指定，配置形式和上面的registry一样

config {

# file、nacos 、apollo、zk、consul、etcd3

type = "nacos" #修改

nacos {

serverAddr = "127.0.0.1:8848" #修改

namespace = ""

group = "SEATA_GROUP"

}

# 以下代码省略...

}

需要注意的是，如果这里的type是file的话，他默认会加载file.conf文件中的配置信息，那这里就需要讲解一下file.conf文件了

file.conf配置说明

此配置文件存储的是Seata服务端的配置信息，完成配置是：transport(协议配置)、server(服务端配置)、metrics(监控)

transport {# tcp udt unix-domain-sockettype = "TCP"#NIO NATIVEserver = "NIO"#enable heartbeatheartbeat = true# the client batch send request enableenableClientBatchSendRequest = false#thread factory for nettythreadFactory {bossThreadPrefix = "NettyBoss"workerThreadPrefix = "NettyServerNIOWorker"serverExecutorThreadPrefix = "NettyServerBizHandler"shareBossWorker = falseclientSelectorThreadPrefix = "NettyClientSelector"clientSelectorThreadSize = 1clientWorkerThreadPrefix = "NettyClientWorkerThread"# netty boss thread size,will not be used for UDTbossThreadSize = 1#auto default pin or 8workerThreadSize = "default"}shutdown {# when destroy server, wait secondswait = 3}serialization = "seata"compressor = "none"
}
# service configuration, only used in client side
service {#transaction service group mappingvgroupMapping.my_test_tx_group = "default"#only support when registry.type=file, please don't set multiple addressesdefault.grouplist = "127.0.0.1:8091"#degrade, current not supportenableDegrade = false#disable seatadisableGlobalTransaction = false
}
#client transaction configuration, only used in client side
client {rm {asyncCommitBufferLimit = 10000lock {retryInterval = 10retryTimes = 30retryPolicyBranchRollbackOnConflict = true}reportRetryCount = 5tableMetaCheckEnable = falsereportSuccessEnable = falsesqlParserType = druid}tm {commitRetryCount = 5rollbackRetryCount = 5}undo {dataValidation = truelogSerialization = "jackson"logTable = "undo_log"}log {exceptionRate = 100}
}## transaction log store, only used in server side
## 事务日志存储配置
store {## store mode: file、dbmode = "file"## file store property## 文件存储的配置属性file {## store location dirdir = "sessionStore"# branch session size , if exceeded first try compress lockkey, still exceeded throws exceptionsmaxBranchSessionSize = 16384# globe session size , if exceeded throws exceptionsmaxGlobalSessionSize = 512# file buffer size , if exceeded allocate new bufferfileWriteBufferCacheSize = 16384# when recover batch read sizesessionReloadReadSize = 100# async, syncflushDiskMode = async}## database store property## 数据库存储的配置属性db {## 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://127.0.0.1:3306/seata"user = "mysql"password = "mysql"minConn = 1maxConn = 10globalTable = "global_table" # db模式全局事务表名branchTable = "branch_table" # db模式分支事务表名lockTable = "lock_table" # db模式全局锁表名queryLimit = 100 # db模式查询全局事务一次的最大条数}
}
## server configuration, only used in server side
# server服务端配置
server {recovery {#schedule committing retry period in milliseconds
# 两阶段提交未完成状态全局事务重试提交线程间隔时间committingRetryPeriod = 1000#schedule asyn committing retry period in milliseconds
# 两阶段异步提交状态重试提交线程间隔时间asynCommittingRetryPeriod = 1000#schedule rollbacking retry period in milliseconds
#两阶段回滚状态重试回滚线程间隔时间rollbackingRetryPeriod = 1000#schedule timeout retry period in milliseconds
#超时状态监测重试线程间隔时间timeoutRetryPeriod = 1000}undo {
# undo保留天数logSaveDays = 7#schedule delete expired undo_log in milliseconds
#undo清理线程间隔时间(ms)logDeletePeriod = 86400000}#unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanentmaxCommitRetryTimeout = "-1"maxRollbackRetryTimeout = "-1"rollbackRetryTimeoutUnlockEnable = false
}## metrics configuration, only used in server side
## 监控设置
metrics {# 是否启动enabled = false# 指标注册器类型registryType = "compact"# multi exporters use comma divided# 指标结果prometheus数据输出器列表exporterList = "prometheus"# prometheus输出器Client端口号exporterPrometheusPort = 9898
}