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https://issues.apache.org/jira/browse/SCB-1622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei Zhang updated SCB-1622:
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Description:
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 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]
> Improve the transaction compensation mechanism for FSM
> ------------------------------------------------------
>
> Key: SCB-1622
> URL: https://issues.apache.org/jira/browse/SCB-1622
> Project: Apache ServiceComb
> Issue Type: Task
> Components: Saga
> Reporter: 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 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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