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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2020/03/06 09:15:08 UTC

[GitHub] [servicecomb-pack] dingsongjie opened a new issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问

dingsongjie opened a new issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问
URL: https://github.com/apache/servicecomb-pack/issues/636
 
 
           有A,B,C 三个服务。 服务B中事务成功执行 ，然而 服务C中事务成功执行，却在omega 发送end指令前重启了，A服务会接收到C服务出错的信息，会进行补偿操作 。
          此时alpha 知道 B中事务已经完成，C中事务只是开始,应该只会对B中之前执行的事务进行补偿，然而此时C服务的事务其实已经被执行了。
          我所说的这种情况会不会发生，如果不会发生是怎么避免的？

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[GitHub] [servicecomb-pack] xiaozhitaba commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问

Posted by GitBox <gi...@apache.org>.
xiaozhitaba commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问
URL: https://github.com/apache/servicecomb-pack/issues/636#issuecomment-595708399
 
 
   你的是哪个设计文档 

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[GitHub] [servicecomb-pack] WillemJiang commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问

Posted by GitBox <gi...@apache.org>.
WillemJiang commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问
URL: https://github.com/apache/servicecomb-pack/issues/636#issuecomment-595809706
 
 
   为了简化操作， C服务在执行的过程中需要保证其原子性， 这里我们可以通过Spring 提供的Transactional注解来保证。 当Omega发现Transaction end指令给Alpha的的时候Alpha重启， Omega的这个指令是会发送失败的， C服务的执行就会失败， 如果C服务有相关的数据库提交的， 那C服务是需要进行相关的回滚操作的。 

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[GitHub] [servicecomb-pack] coolbeevip commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问

Posted by GitBox <gi...@apache.org>.
coolbeevip commented on issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问
URL: https://github.com/apache/servicecomb-pack/issues/636#issuecomment-596079062
 
 
   正如 @WillemJiang 所说每个服务的方法中需要保证自身的原子事务（例如C服务的方法中使用数据库事务）
   
   如果你的C方法中无法保证原子事务（例如：C方法就是负责发送一个邮件），那么就需要额外的方式处理，例如在A方法中检测到异常后判断如果C方法出现异常则再补发有一个邮件 :(，此时可能无法判断C服务的异常是在邮件发送成功前还是成功后（也许你需要更多的步骤解决这个问题）
   
   或许我们可以通过一种机制，让A服务捕获到异常时能够知道整个事务链的状态，从而做一些额外的处理 cc @WillemJiang 

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[GitHub] [servicecomb-pack] dingsongjie closed issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问

Posted by GitBox <gi...@apache.org>.
dingsongjie closed issue #636: 我看了一下设计文档,对 sagas 流程有一点疑问
URL: https://github.com/apache/servicecomb-pack/issues/636
 
 
   

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