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# Seata: Simple Extensible Autonomous Transaction Architecture
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## What is Seata?
A **distributed transaction solution** with high performance and ease of use for **microservices** architecture.
### Distributed Transaction Problem in Microservices
Let's imagine a traditional monolithic application. Its business is built up with 3 modules. They use a single local data source.
Naturally, data consistency will be guaranteed by the local transaction.
![Monolithic App](https://cdn.nlark.com/lark/0/2018/png/18862/1545296770244-4cedf37e-9dc6-4fc0-a97f-f4240b9d8640.png)
Things have changed in a microservices architecture. The 3 modules mentioned above are designed to be 3 services on top of 3 different data sources ([Pattern: Database per service](http://microservices.io/patterns/data/database-per-service.html)). Data consistency within every single service is naturally guaranteed by the local transaction.
**But how about the whole business logic scope?**
![Microservices Problem](https://cdn.nlark.com/lark/0/2018/png/18862/1545296781231-4029da9c-8803-43a4-ac2f-6c8b1e2ea448.png)
### How Seata do?
Seata is just a solution to the problem mentioned above.
![Seata solution](https://cdn.nlark.com/lark/0/2018/png/18862/1545296791074-3bce7bce-025e-45c3-9386-7b95135dade8.png)
Firstly, how to define a **Distributed Transaction**?
We say, a **Distributed Transaction** is a **Global Transaction** which is made up with a batch of **Branch Transaction**, and normally **Branch Transaction** is just **Local Transaction**.
![Global & Branch](https://cdn.nlark.com/lark/0/2018/png/18862/1545015454979-a18e16f6-ed41-44f1-9c7a-bd82c4d5ff99.png)
There are 3 basic components in Seata:
- **Transaction Coordinator(TC):** Maintain status of global and branch transactions, drive the global commit or rollback.
- **Transaction Manager(TM):** Define the scope of global transaction: begin a global transaction, commit or rollback a global transaction.
- **Resource Manager(RM):** Manage resources that branch transactions working on, talk to TC for registering branch transactions and reporting status of branch transactions, and drive the branch transaction commit or rollback.
![Model](https://cdn.nlark.com/lark/0/2018/png/18862/1545013915286-4a90f0df-5fda-41e1-91e0-2aa3d331c035.png)
A typical lifecycle of Seata managed distributed transaction:
1. TM asks TC to begin a new global transaction. TC generates an XID representing the global transaction.
2. XID is propagated through microservices' invoke chain.
3. RM registers local transaction as a branch of the corresponding global transaction of XID to TC.
4. TM asks TC for committing or rollbacking the corresponding global transaction of XID.
5. TC drives all branch transactions under the corresponding global transaction of XID to finish branch committing or rollbacking.
![Typical Process](https://cdn.nlark.com/lark/0/2018/png/18862/1545296917881-26fabeb9-71fa-4f3e-8a7a-fc317d3389f4.png)
For more details about principle and design, please go to [Seata wiki page](https://github.com/seata/seata/wiki).
### History
##### Ant Financial
- **XTS**: Extended Transaction Service. Ant Financial middleware team developed the distributed transaction middleware since 2007, which is widely used in Ant Financial and solves the problems of data consistency across databases and services.
- **DTX**: Distributed Transaction Extended. Since 2013, XTS has been published on the Ant Financial Cloud, with the name of DTX .
##### Alibaba
- **TXC**: Taobao Transaction Constructor. Alibaba middleware team started this project since 2014 to meet the distributed transaction problems caused by application architecture change from monolithic to microservices.
- **GTS**: Global Transaction Service. TXC as an Aliyun middleware product with new name GTS was published since 2016.
- **Fescar**: we started the open source project Fescar based on TXC/GTS since 2019 to work closely with the community in the future.
##### Seata Community
- **Seata** :Simple Extensible Autonomous Transaction Architecture. Ant Financial joins Fescar, which make it to be a more neutral and open community for distributed transaction, and Fescar be renamed to Seata.
## Maven dependency
```xml
<seata.version>1.4.2</seata.version>
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-all</artifactId>
<version>${seata.version}</version>
</dependency>
```
## Quick Start
[Quick Start](https://github.com/seata/seata/wiki/Quick-Start)
## Documentation
You can view the full documentation from the wiki: [Seata wiki page](https://github.com/seata/seata/wiki).
## Reporting bugs
Please follow the [template](https://github.com/seata/seata/blob/develop/.github/ISSUE_TEMPLATE/BUG_REPORT.md) for reporting any issues.
## Contributing
Contributors are welcomed to join the Seata project. Please check [CONTRIBUTING](./CONTRIBUTING.md) about how to contribute to this project.
## Contact
* [Twitter](https://twitter.com/seataio): Follow along for latest Seata news on Twitter.
* Mailing list:
* dev-seata@googlegroups.com , for dev/user discussion. [subscribe](mailto:dev-seata+subscribe@googlegroups.com), [unsubscribe](mailto:dev-seata+unsubscribe@googlegroups.com), [archive](https://groups.google.com/forum/#!forum/dev-seata)
<img src="https://img.alicdn.com/imgextra/i3/O1CN01FKBxyk25Ffx83dIJc_!!6000000007497-0-tps-1078-354.jpg" height="200" width="630">
## Seata ecosystem
* [Seata Ecosystem Entry](https://github.com/seata) - A GitHub group `seata` to gather all Seata relevant projects
* [Seata GoLang](https://github.com/opentrx/seata-golang) - Seata GoLang client and server
* [Seata Samples](https://github.com/seata/seata-samples) - Samples for Seata
* [Seata Docker](https://github.com/seata/seata-docker) - Seata integration with docker
* [Seata K8s](https://github.com/seata/seata-k8s) - Seata integration with k8s
* [Awesome Seata](https://github.com/seata/awesome-seata) - Seata's slides and video address in meetup
* [Seata Website](https://github.com/seata/seata.github.io) - Seata official website
## Contributors
This project exists thanks to all the people who contribute. [[Contributors](https://github.com/seata/seata/graphs/contributors)].
## License
Seata is under the Apache 2.0 license. See the [LICENSE](https://github.com/seata/seata/blob/master/LICENSE) file for details.
## Who is using
These are only part of the companies using Seata, for reference only. If you are using Seata, please [add your company
here](https://github.com/seata/seata/issues/1246) to tell us your scenario to make Seata better.
<div style='vertical-align: middle'>
<img alt='Alibaba Group' height='40' src='https://docs.alibabagroup.com/assets2/images/en/global/logo_header.png' /img>
<img alt='蚂蚁金服' height='40' src='https://img.alicdn.com/tfs/TB1wuuCoET1gK0jSZFhXXaAtVXa-496-202.jpg' /img>
<img alt='阿里云' height='40' src='https://img.alicdn.com/tfs/TB1Ly5oS3HqK1RjSZFPXXcwapXa-238-54.png' /img>
<img alt='中航信' height='40' src='https://www.travelskyir.com/img/logo.gif' /img>
<img alt='联通(浙江)' height='40' src='https://img.alicdn.com/tfs/TB1hvabw9f2gK0jSZF
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github太慢了 尽快备份,seata142sql (1702个子文件)
io.seata.server.coordinator.AbstractCore 157B
io.seata.rm.AbstractRMHandler 630B
io.seata.rm.AbstractRMHandler 47B
io.seata.rm.AbstractRMHandler 28B
io.seata.core.auth.AuthSigner 636B
.babelrc 805B
mvnw.cmd 5KB
io.seata.core.compressor.Compressor 47B
io.seata.core.compressor.Compressor 43B
io.seata.core.compressor.Compressor 41B
io.seata.core.compressor.Compressor 39B
io.seata.core.compressor.Compressor 37B
io.seata.core.compressor.Compressor 37B
file.conf 2KB
registry.conf 2KB
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registry-test.conf 1KB
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file.conf 1KB
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file.conf 714B
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logstash-logback.conf 353B
logstash-kafka.conf 271B
file.conf 261B
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file-test-pro.conf 260B
file-test-yaml.conf 260B
file-test.conf 260B
registry.conf 67B
registry.conf 67B
registry.conf 63B
io.seata.config.ConfigurationProvider 60B
io.seata.config.ConfigurationProvider 50B
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io.seata.config.ConfigurationProvider 47B
io.seata.core.context.ContextCore 93B
copyright 572B
io.seata.core.store.db.DataSourceProvider 137B
io.seata.sqlparser.util.DbTypeParser 653B
io.seata.sqlparser.util.DbTypeParser 53B
Dockerfile 894B
.eslintignore 20B
file.conf.example 3KB
io.seata.metrics.exporter.Exporter 55B
io.seata.config.ExtConfigurationProvider 75B
spring.factories 339B
io.seata.config.file.FileConfig 74B
com.alipay.sofa.rpc.filter.Filter 125B
com.alibaba.dubbo.rpc.Filter 75B
org.apache.dubbo.rpc.Filter 66B
com.weibo.api.motan.filter.Filter 49B
MySqlParser.g4 81KB
MySqlLexer.g4 56KB
.gitignore 645B
.gitignore 25B
io.seata.common.loader.Hello 704B
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index.html 901B
io.seata.rm.datasource.exec.InsertExecutor 773B
MySqlLexer.interp 434KB
MySqlParser.interp 278KB
io.seata.rm.datasource.undo.parser.spi.JacksonSerializer 670B
maven-wrapper.jar 47KB
MySqlParser.java 2.7MB
MySqlLexer.java 419KB
MySqlParserListener.java 239KB
MySqlParserBaseListener.java 197KB
MySqlParserBaseVisitor.java 145KB
MySqlParserVisitor.java 136KB
StateMachineDBTests.java 48KB
DbAndReportTcStateLogStore.java 48KB
ProcessCtrlStateMachineEngine.java 32KB
UndoExecutorTest.java 30KB
MySQLInsertExecutorTest.java 28KB
LogStoreDataBaseDAOTest.java 27KB
MySQLKeywordChecker.java 25KB
StateMachineDBMockServerTests.java 24KB
DataBaseSessionManagerTest.java 24KB
MockDatabaseMetaData.java 24KB
EnhancedServiceLoader.java 23KB
XAModeTest2.java 23KB
FileTransactionStoreManager.java 23KB
BatchInsertExecutorTest.java 22KB
LogStoreDataBaseDAO.java 22KB
DefaultCoordinator.java 22KB
GlobalSession.java 21KB
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