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## About SEATA 柔性事务
**【参考】** Seata 柔性事务 — ShardingSphere：[https://shardingsphere.apache.org/document/current/cn/reference/transaction/base-transaction-seata/](https://shardingsphere.apache.org/document/current/cn/reference/transaction/base-transaction-seata/)

## 服务构建

* **服务规划**

|服务|IP|备注|
|----|----|----|
|Sysbench|127.0.0.1|Version:1.0.20|
|MySQL|127.0.0.1|Version:5.7.26|
|ShardingSphere-Proxy|127.0.0.1|GitHub - apache/shardingsphere:[https://github.com/apache/shardingsphere](https://github.com/apache/shardingsphere)|
|Seata|127.0.0.1|Version:1.4.2|

* **ShardingSphere-Proxy 构建配置**

#### PROXY 获取
**【参考】**

1、**How to Set Up Your DEV Environment：**

[https://shardingsphere.apache.org/community/cn/contribute/establish-project/](https://shardingsphere.apache.org/community/cn/contribute/establish-project/)

2、**Nightly Build：** [http://117.48.121.24:8080/Proxy/](http://117.48.121.24:8080/Proxy/)

3、**官网下载：**[https://shardingsphere.apache.org/document/current/cn/downloads/](https://shardingsphere.apache.org/document/current/cn/downloads/)

#### CONF 相关
SERVER.YAML

~~~
######################################################################################################

#

# If you want to configure governance, authorization and proxy properties, please refer to this file.

#

######################################################################################################

# mode:
#  type: Cluster
#  repository:
#    type: Zookeeper
#    props:
#      namespace: governance_ds
#      server-lists: localhost:2181
#      retryIntervalMilliseconds: 500
#      timeToLiveSeconds: 60
#      maxRetries: 3
#      operationTimeoutMilliseconds: 500
#  overwrite: true

rules:
 - !AUTHORITY
   users:
     - root@%:root
     - sharding@:sharding
   provider:
     type: NATIVE
#scaling:
#  blockQueueSize: 10000
#  workerThread: 40

- !TRANSACTION
   defaultType: BASE
   providerType: Seata

props:
 max-connections-size-per-query: 1
 sql-show: true
#  executor-size: 16  # Infinite by default.
#  proxy-frontend-flush-threshold: 128  # The default value is 128.
#    # LOCAL: Proxy will run with LOCAL transaction.
#    # XA: Proxy will run with XA transaction.
#    # BASE: Proxy will run with B.A.S.E transaction.
#  proxy-transaction-type: LOCAL
#  xa-transaction-manager-type: Atomikos
#  proxy-opentracing-enabled: false
#  proxy-hint-enabled: false
#  sql-show: false
#  check-table-metadata-enabled: false
#  lock-wait-timeout-milliseconds: 50000 # The maximum time to wait for a lock
#    # Proxy backend query fetch size. A larger value may increase the memory usage of ShardingSphere Proxy.
#    # The default value is -1, which means set the minimum value for different JDBC drivers.
#  proxy-backend-query-fetch-size: -1
~~~
CONFIG-SHARDING.YAML

~~~
schemaName: sbtest_sharding

dataSources:

ds_0:
    url: jdbc:mysql://127.0.0.1:3306/sbtest_sharding?useSSL=false&useServerPrepStmts=true&cachePrepStmts=true&prepStmtCacheSize=8192&prepStmtCacheSqlLimit=1024
    username: root
    password: passwd
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 3000
    minPoolSize: 1

ds_1:
    url: jdbc:mysql://127.0.0.2:3306/sbtest_sharding?useSSL=false&useServerPrepStmts=true&cachePrepStmts=true&prepStmtCacheSize=8192&prepStmtCacheSqlLimit=1024    
    username: root
    password: passwd
    connectionTimeoutMilliseconds: 30000
    idleTimeoutMilliseconds: 60000
    maxLifetimeMilliseconds: 1800000
    maxPoolSize: 3000
    minPoolSize: 1

rules:
  - !SHARDING
    tables:
      sbtest1:
        actualDataNodes: ds_${0..1}.sbtest1_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_1
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest2:
        actualDataNodes: ds_${0..1}.sbtest2_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_2
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest3:
        actualDataNodes: ds_${0..1}.sbtest3_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_3
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest4:
        actualDataNodes: ds_${0..1}.sbtest4_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_4
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest5:
        actualDataNodes: ds_${0..1}.sbtest5_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_5
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest6:
        actualDataNodes: ds_${0..1}.sbtest6_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_6
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest7:
        actualDataNodes: ds_${0..1}.sbtest7_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_7
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest8:
        actualDataNodes: ds_${0..1}.sbtest8_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_8
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest9:
        actualDataNodes: ds_${0..1}.sbtest9_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_9
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

sbtest10:
        actualDataNodes: ds_${0..1}.sbtest10_${0..9}
        tableStrategy:
          standard:
            shardingColumn: id
            shardingAlgorithmName: table_inline_10
        keyGenerateStrategy:
          column: id
          keyGeneratorName: snowflake

defaultDatabaseStrategy:
      standard:
        shardingColumn: id
        shardingAlgorithmName: database_inline

shardingAlgorithms:
      database_inline:
        type: INLINE
        props:
          algorithm-expression: ds_${id & 1}
      table_inline_1:
        type: INLINE
        props:
          algorithm-expression: sbtest1_${id % 10}
      table_inline_2:
        type: INLINE
        props:
          algorithm-expression: sbtest2_${id % 10}
      table_inline_3:
        type: INLINE
        props:
          algorithm-expression: sbtest3_${id % 10}
      table_inline_4:
        type: INLINE
        props:
          algorithm-expression: sbtest4_${id % 10}
      table_inline_5:
        type: INLINE
        props:
          algorithm-expression: sbtest5_${id % 10}
      table_inline_6:
        type: INLINE
        props:
          algorithm-expression: sbtest6_${id % 10}
      table_inline_7:
        type: INLINE
        props:
          algorithm-expression: sbtest7_${id % 10}
      table_inline_8:
        type: INLINE
        props:
          algorithm-expression: sbtest8_${id % 10}
      table_inline_9:
        type: INLINE
        props:
          algorithm-expression: sbtest9_${id % 10}
      table_inline_10:
        type: INLINE
        props:
          algorithm-expression: sbtest10_${id % 10}
    keyGenerators:
      snowflake:
        type: SNOWFLAKE
        props:
          worker-id: 123
~~~
SEATA.CONF

~~~
client {
    application.id = id
    transaction.service.group = my_test_tx_group
}
~~~
FILE.CONF

~~~
## transaction log store, only used in seata-server

store {
  ## store mode: file、db、redis
  mode = "file"

## 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 = "root"
    password = "123456"
    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
  }
}

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  #thread factory for netty
  thread-factory {
    boss-thread-prefix = "NettyBoss"
    worker-thread-prefix = "NettyServerNIOWorker"
    server-executor-thread-prefix = "NettyServerBizHandler"
    share-boss-worker = false
    client-selector-thread-prefix = "NettyClientSelector"
    client-selector-thread-size = 1
    client-worker-thread-prefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    boss-thread-size = 1
    #auto default pin or 8
    worker-thread-size = 8
  }
}

service {
  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 {
  async.commit.buffer.limit = 10000
  lock {
    retry.internal = 10
    retry.times = 30
  }
}
~~~
REGISTRY.CONF

~~~
registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "file"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10

nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }

eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    weight = "1"
  }

redis {
    serverAddr = "localhost:6379"
    db = 0
    password = ""
    cluster = "default"
    timeout = 0
  }

zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }

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 = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
  }

consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    appId = "seata-server"
    apolloMeta = "http://192.168.1.204:8801"
    namespace = "application"
    apolloAccesskeySecret = ""
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}
~~~

#### LIB 相关

~~~
#### 增加以下包

wget https://repo1.maven.org/maven2/mysql/mysql-connector-java/8.0.26/mysql-connector-java-8.0.26.jar
wget https://repo1.maven.org/maven2/com/github/ben-manes/caffeine/caffeine/2.7.0/caffeine-2.7.0.jar
wget https://repo1.maven.org/maven2/io/seata/seata-all/1.4.2/seata-all-1.4.2.jar
wget https://repo1.maven.org/maven2/org/apache/shardingsphere/shardingsphere-infra-optimize/5.0.0/shardingsphere-infra-optimize-5.0.0.jar
wget https://repo1.maven.org/maven2/cglib/cglib/3.1/cglib-3.1.jar
wget https://repo1.maven.org/maven2/org/apache/commons/commons-pool2/2.9.0/commons-pool2-2.9.0.jar
wget https://repo1.maven.org/maven2/commons-pool/commons-pool/1.6/commons-pool-1.6.jar
wget https://repo1.maven.org/maven2/com/typesafe/config/1.2.1/config-1.2.1.jar

#### 删除以下包，否则会有冲突
[root@localhost lib]# ll -thrl | grep xa
-rw-r--r--. 1 root root  44K Nov 27 12:36 shardingsphere-transaction-xa-core-5.0.1-SNAPSHOT.jar
-rw-r--r--. 1 root root  11K Nov 27 12:36 shardingsphere-transaction-xa-spi-5.0.1-SNAPSHOT.jar
-rw-r--r--. 1 root root  13K Nov 27 12:36 shardingsphere-transaction-xa-atomikos-5.0.1-SNAPSHOT.jar
### 获取 shardingsphere-transaction-base-seata-at-5.0.1-SNAPSHOT.jar
shardingsphere-transaction-base-seata-at-5.0.1-SNAPSHOT.jar
git clone https://github.com/apache/shardingsphere.git
cd shardingsphere
./mvnw -Dmaven.javadoc.skip=true -Djacoco.skip=true -DskipITs -DskipTests clean install -T1C -Prelease
ll ./shardingsphere-kernel/shardingsphere-transaction/shardingsphere-transaction-type/shardingsphere-transaction-base/shardingsphere-transaction-base-seata-at/target/shardingsphere-transaction-base-seata-at-5.0.1-SNAPSHOT.jar

wget https://repo1.maven.org/maven2/org/apache/shardingsphere/shardingsphere-transaction-base-seata-at/5.0.0/shardingsphere-transaction-base-seata-at-5.0.0.jar
~~~

* **Seata 构建**

DOCKER 启动

~~~
docker run -d --name seata-server -p 8091:8091 seataio/seata-server:1.4.2
~~~
容器命令行及查看日志

~~~
$ docker exec -it seata-server sh
$ docker logs -f seata-server
~~~
直接部署

~~~
https://github.com/seata/seata/archive/refs/tags/v1.4.2.zip
unzip v1.4.2.zip
sh ./bin/seata-server.sh -p 8091 -h 127.0.0.1 -m file
~~~
**【参考】** [https://seata.io/zh-cn/docs/ops/deploy-server.html](https://seata.io/zh-cn/docs/ops/deploy-server.html)

* **DB 配置**

MYSQL 建表语句

~~~
### proxy 中的每个 ds 建表

CREATE TABLE undo_log (id bigint(20) NOT NULL AUTO_INCREMENT,branch_id bigint(20) NOT NULL,xid varchar(100) NOT NULL,context varchar(128) NOT NULL,rollback_info longblob NOT NULL,log_status int(11) 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))  AUTO_INCREMENT=1 ;
~~~
POSTGRESQL 建表语句

~~~
#### Proxy 的每个 ds 均需创建
CREATE TABLE "public"."undo_log" (
"id" SERIAL NOT NULL primary key,
"branch_id" int8 NOT NULL,
"xid" varchar(100) COLLATE "default" NOT NULL,
"context" varchar(128) COLLATE "default" NOT NULL,
"rollback_info" bytea NOT NULL,
"log_status" int4 NOT NULL,
"log_created" timestamp(6) NOT NULL,
"log_modified" timestamp(6) NOT NULL,
"ext" varchar(100) COLLATE "default" DEFAULT NULL::character varying,
CONSTRAINT "unq_idx_ul_branchId_xid" UNIQUE ("branch_id", "xid")
)
WITH (OIDS=FALSE)
;
ALTER TABLE "public"."undo_log" OWNER TO "postgres";
~~~
## 压测过程

~~~
### seata
./seata-server.sh -h 127.0.0.1 -p 8091 -m  file  > ../seata.log &

### proxy
./bin/start.sh

### sysbench
sysbench oltp_read_write --mysql-host=127.0.0.1 --mysql-port=3307 --mysql-user=root --mysql-password=root --mysql-db=sbtest_sharding --tables=10 --table-size=1000000 --report-interval=10 --time=10 --threads=1 --max-requests=0 --percentile=99  --rand-type=uniform --range_selects=off --auto_inc=off run
~~~

## 结果展示

Check 1: Proxy 成功注册入 Seata

![](http://img.blog.itpub.net/blog/2021/12/24/b93ddbf29a54d6a6.png?x-oss-process=style/bb)

Check 2: Proxy 正常执行事务

![](http://img.blog.itpub.net/blog/2021/12/24/2b1132bb180d0a3a.png?x-oss-process=style/bb)

**【参考】** Sharding-Proxy 如何集成分布式事务 Seata：[https://community.sphere-ex.com/t/topic/404/2](https://community.sphere-ex.com/t/topic/404/2)

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