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Posted to issues@servicecomb.apache.org by "Lei Zhang (Jira)" <ji...@apache.org> on 2019/11/28 01:56:00 UTC

[jira] [Updated] (SCB-1622) Improve the transaction compensation mechanism

     [ https://issues.apache.org/jira/browse/SCB-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lei Zhang updated SCB-1622:
---------------------------
    Summary: Improve the transaction compensation mechanism  (was: Improve the transaction compensation mechanism for FSM)

> Improve the transaction compensation mechanism
> ----------------------------------------------
>
>                 Key: SCB-1622
>                 URL: https://issues.apache.org/jira/browse/SCB-1622
>             Project: Apache ServiceComb
>          Issue Type: Task
>          Components: Saga
>            Reporter: Lei Zhang
>            Assignee: Lei Zhang
>            Priority: Major
>
> Currently, Alpha compensation mechanism has some defects [1]，When the compensation method fails, only the output log without throwing an exception. Alpha does not know that the compensation method failed.
>  
>  Step1: Modify the OnConnected method to bidirectional streaming RPC
>  This will be needed for the Step2
>   
>  Step2: Catch an exception and send a compensation result to Alpha in the compensation method[1] on the Omega side. Alpha waits for compensation result and catching exception after calling compensation method
>  1. Received TxCompensateSucceedAckEvent: transaction completed
>  2. Received TxCompensateFailedAckEvent: throw BusinessCompensationFailureException
>  3. catch other exception throw OmegaConnectedException 
>   
>  Step3. Added retry and timeout rule to compensate for failures
>   Exceeded the number of retries or timeout will change state to suspended
> [1] [https://github.com/apache/servicecomb-pack/issues/590]
>  



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