Seata 是什么 | Apache SeataSeata 是一款开源的分布式事务解决方案致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式为用户打造一站式的分布式解决方案。https://seata.apache.org/zh-cn/docs/overview/what-is-seata/新人文档 | Apache SeataSeata分TC、TM和RM三个角色TCServer端为单独服务端部署TM和RMClient端由业务系统集成。https://seata.apache.org/zh-cn/docs/v2.0/ops/deploy-guide-beginner简单理解上面的流程三个角色TC、TM、RM1、TM向TC申请全局事务成功后生成XID2、XID在微服务上下文中传递3、RM向TC注册分支事务和XID进行关联绑定管辖4、TM向TC发起全局的提交或回滚5、TC调度XID管辖范围内的全部分支事务进行提交或回滚TC作为服务需要seata数据库及固定的表(4张表branch_table、distributed_lock、global_table、local_table)每个RM需要一张undo_log表1 准备seata数据库# 生成mysql容器mysql-seatadocker run -d \-p 2306:3306 \-v /server/seata/conf:/etc/mysql/conf.d \-v /server/seata/data:/var/lib/mysql \-e MYSQL_ROOT_PASSWORD123456 \--name mysql-seata \mysql:8.0.30# 建库、建表CREATE DATABASE seata;USE seata;建表sql-- -------------------------------- 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_status_gmt_modified (status , gmt_modified), KEY idx_transaction_id (transaction_id) ) ENGINE InnoDB DEFAULT CHARSET utf8mb4; -- 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 utf8mb4; -- the table to store lock data CREATE TABLE IF NOT EXISTS lock_table ( row_key VARCHAR(128) NOT NULL, xid VARCHAR(128), transaction_id BIGINT, branch_id BIGINT NOT NULL, resource_id VARCHAR(256), table_name VARCHAR(32), pk VARCHAR(36), status TINYINT NOT NULL DEFAULT 0 COMMENT 0:locked ,1:rollbacking, gmt_create DATETIME, gmt_modified DATETIME, PRIMARY KEY (row_key), KEY idx_status (status), KEY idx_branch_id (branch_id), KEY idx_xid (xid) ) ENGINE InnoDB DEFAULT CHARSET utf8mb4; CREATE TABLE IF NOT EXISTS distributed_lock ( lock_key CHAR(20) NOT NULL, lock_value VARCHAR(20) NOT NULL, expire BIGINT, primary key (lock_key) ) ENGINE InnoDB DEFAULT CHARSET utf8mb4; INSERT INTO distributed_lock (lock_key, lock_value, expire) VALUES (AsyncCommitting, , 0); INSERT INTO distributed_lock (lock_key, lock_value, expire) VALUES (RetryCommitting, , 0); INSERT INTO distributed_lock (lock_key, lock_value, expire) VALUES (RetryRollbacking, , 0); INSERT INTO distributed_lock (lock_key, lock_value, expire) VALUES (TxTimeoutCheck, , 0);2 准备业务数据库# 生成mysql容器mysql-seata-bizdocker run -d \-p 2307:3306 \-v /server/seataBiz/conf:/etc/mysql/conf.d \-v /server/seataBiz/data:/var/lib/mysql \-e MYSQL_ROOT_PASSWORD123456 \--name mysql-seata-biz \mysql:8.0.30准备seata_account、seata_order、seata_stroage业务数据库# 建order库、表CREATE DATABASE seata_order;CREATE TABLE t_order(id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,user_id BIGINT(11) DEFAULT NULL COMMENT 用户id,product_id BIGINT(11)DEFAULT NULL COMMENT 产品id,count INT(11) DEFAULT NULL COMMENT 数量,money DECIMAL(11,0) DEFAULT NULL COMMENT 金额,status INT(1) DEFAULT NULL COMMENT 订单状态: 0:创建中; 1:已完结)ENGINEINNODB AUTO_INCREMENT1 DEFAULT CHARSETutf8;SELECT * FROM t_order;# 建stroage库、表CREATE DATABASE seata_storage;CREATE TABLE t_storage(id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,product_id BIGINT(11) DEFAULT NULL COMMENT 产品id,total INT(11) DEFAULT NULL COMMENT 总库存,used INT(11) DEFAULT NULL COMMENT 已用库存,residue INT(11) DEFAULT NULL COMMENT 剩余库存)ENGINEINNODB AUTO_INCREMENT1 DEFAULT CHARSETutf8;INSERT INTO t_storage(id,product_id,total,used,residue)VALUES(1,1,100,0,100);SELECT * FROM t_storage;# 建account库、表CREATE DATABASE seata_account;CREATE TABLE t_account(id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT id,user_id BIGINT(11) DEFAULT NULL COMMENT 用户id,total DECIMAL(10,0) DEFAULT NULL COMMENT 总额度,used DECIMAL(10,0) DEFAULT NULL COMMENT 已用账户余额,residue DECIMAL(10,0) DEFAULT 0 COMMENT 剩余可用额度)ENGINEINNODB AUTO_INCREMENT2 DEFAULT CHARSETutf8;INSERT INTO t_account(id,user_id,total,used,residue)VALUES(1,1,1000,0,1000);SELECT * FROM t_account;3个库分表建undo_log表- for AT mode you must to init this sql for you business database. the seata server not need it. CREATE TABLE IF NOT EXISTS undo_log ( branch_id BIGINT NOT NULL COMMENT branch transaction id, xid VARCHAR(128) NOT NULL COMMENT global transaction id, context VARCHAR(128) NOT NULL COMMENT undo_log context,such as serialization, rollback_info LONGBLOB NOT NULL COMMENT rollback info, log_status INT(11) NOT NULL COMMENT 0:normal status,1:defense status, log_created DATETIME(6) NOT NULL COMMENT create datetime, log_modified DATETIME(6) NOT NULL COMMENT modify datetime, UNIQUE KEY ux_undo_log (xid, branch_id) ) ENGINE InnoDB AUTO_INCREMENT 1 DEFAULT CHARSET utf8mb4 COMMENT AT transaction mode undo table; ALTER TABLE undo_log ADD INDEX ix_log_created (log_created);3 准备nacos注册中心docker pull nacos/nacos-server:v2.2.3# 创建nacos容器docker run --name nacos -e MODEstandalone -p 8848:8848 -p 9848:9848 -d nacos/nacos-server:v2.2.34 TC作为server单独部署https://github.com/apache/incubator-seata/releases/tag/v2.0.0docker pull seataio/seata-server:2.0.0启动先确认已启动nacosdocker run -d --name seata-server \-p 8091:8091 \-p 7091:7091 \-v /seata/config/resources:/seata-server/resources \seataio/seata-server:2.0.0# 默认配置问题1 先启动临时seata-server-temp,让容器自动生成默认的配置文件docker run -d --name seata-server-temp \-p 8091:8091 \-p 7091:7091 \seataio/seata-server:2.0.02 再将配置文件拷贝到指定目录下mkdir -p seata/config/resourcesdocker cp seata-server-temp:/seata-server/resources/. seata/config/resources/3 删除临时容器重新执行指定的创建容器命令docker rm seata-server-tempdocker run -d --name seata-server \-p 8091:8091 \-p 7091:7091 \-v /seata/config/resources:/seata-server/resources \seataio/seata-server:2.0.0到/seata/config/resources下修改配置文件 application.yml启动后报错docker logs seata-serverapm-skywalking not enabledJMX disabledAffected JVM parameters: -Dlog.home/root/logs/seata -server -Dloader.path/lib -Xmx2048m -Xms2048m -Xss640k -XX:SurvivorRatio10 -XX:MetaspaceSize128m -XX:MaxMetaspaceSize256m -XX:MaxDirectMemorySize1024m -XX:-OmitStackTraceInFastThrow -XX:-UseAdaptiveSizePolicy -XX:HeapDumpOnOutOfMemoryError -XX:HeapDumpPath/root/logs/seata/java_heapdump.hprof -XX:DisableExplicitGC -Xloggc:/root/logs/seata/seata_gc.log -verbose:gc -XX:PrintGCDetails -XX:PrintGCDateStamps -XX:PrintGCTimeStamps -XX:UseGCLogFileRotation -XX:NumberOfGCLogFiles10 -XX:GCLogFileSize100M -XX:UnlockExperimentalVMOptions -XX:UseG1GC -Dio.netty.leakDetectionLeveladvanced -Dapp.nameseata-server -Dapp.pid1 -Dapp.home/ -Dbasedir/OpenJDK 64-Bit Server VM warning: Cannot open file /root/logs/seata/seata_gc.log due to No such file or directoryOpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000080000000, 2147483648, 0) failed; errorCannot allocate memory (errno12)## There is insufficient memory for the Java Runtime Environment to continue.# Native memory allocation (mmap) failed to map 2147483648 bytes for committing reserved memory.# An error report file with more information is saved as:# /seata-server/hs_err_pid1.log修复---- 启动参数加上内存限制docker run -d --name seata-server -p 8091:8091 -p 7091:7091 -e JMX_OPTS-Xmx512m -Xms512m -v /seata/config/resources:/seata-server/resources seataio/seata-server:2.0.0seata-server启动成功后注册到nacos中至此环境搭建完成后面可以结合GlobalTransactional配置文件试试效果