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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2021/11/18 03:25:39 UTC
[GitHub] [rocketmq] yedf3 opened a new issue #3500: 事务消息能够快速提交吗？
yedf3 opened a new issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500
有没有事务消息的官方例子？没有找到事务消息的官方例子，谷歌搜出来的靠前的例子为这个：https://segmentfault.com/a/1190000039868496
这个例子的流程如下：
1. 开启本地事务
2. 发送Prepare消息
3. 执行Prepare成功后本地事务，返回UNKNOWN
4. RocketMq回查时，返回COMMIT，最后发送消息
在这个流程中，3执行完之后，最好是要直接发送Commit到RocketMQ，如果走4的话，就会导致6秒超时回查，过了这6秒，业务才被调用，才达到最终一致。业务讨论时反馈没有异常发生也要等待这个6秒太长了
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[GitHub] [rocketmq] Git-Yang commented on issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
Git-Yang commented on issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500#issuecomment-972490289
结合自己业务实际情况处理，如果本地事务执行完后确认ok可以直接返回commit。
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[GitHub] [rocketmq] yedf3 commented on issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
yedf3 commented on issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500#issuecomment-972488724
<img width="755" alt="image" src="https://user-images.githubusercontent.com/88143584/142347013-3fcb23e7-5884-421e-a791-21039363402a.png">
这个地方其实是文章作者理解不对吗？还是说作者说的这种情况可能发生？
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[GitHub] [rocketmq] yedf3 closed issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
yedf3 closed issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500
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[GitHub] [rocketmq] yedf3 commented on issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
yedf3 commented on issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500#issuecomment-972498436
大概了解了。其实是文章作者的例子，在业务成功时，返回COMMIT更好。因为RocketMQ是在提交完本地事务之后，再发送COMMIT消息。
- 在提交本地事务之前掉电，那么COMMIT没有发送，后续走回查，会最终回滚
- 在提交本地事务之后掉电，发送COMMIT之前掉电，那么后续走回查，会最终返回COMMIT
- 没有掉电，那么发送COMMIT消息，很快让业务达到最终一致
官方例子中返回UNKNOWN不是标准做法，仅仅是为了演示一遍回查的逻辑流程
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[GitHub] [rocketmq] Git-Yang commented on issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
Git-Yang commented on issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500#issuecomment-972487793
可以在第3步执行完成本地事务直接返回COMMIT
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[GitHub] [rocketmq] Git-Yang commented on issue #3500: 事务消息能够快速提交吗？
Posted by GitBox <gi...@apache.org>.
Git-Yang commented on issue #3500:
URL: https://github.com/apache/rocketmq/issues/3500#issuecomment-972488475
事务消息官方用例：https://github.com/apache/rocketmq/tree/master/example/src/main/java/org/apache/rocketmq/example/transaction
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