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https://issues.apache.org/jira/browse/SCB-836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Willem Jiang updated SCB-836:
-----------------------------
    Description: 
We can take the 
[nesting-lras|https://github.com/eclipse/microprofile-lra/blob/master/spec/src/main/asciidoc/microprofile-lra-spec.adoc#323-nesting-lras]
 from the microprofile as an example. 


An activity can be scoped within an existing Saga using the @SagaStart 
annotation. Invoking a method marked with this annotation will start a new Saga 
whose outcome depends upon whether the enclosing Saga is closed or cancelled.

* If the nested Saga is closed but the outer Saga is cancelled then the 
participants registered with the nested Saga will be told to compensate.

* If the nested Saga is cancelled the outer Saga can be still closed.

  was:
We can take the 
[nesting-lras|https://github.com/eclipse/microprofile-lra/blob/master/spec/src/main/asciidoc/microprofile-lra-spec.adoc#323-nesting-lras]
 from the microprofile as an example. 


An activity can be scoped within an existing Saga using the @NestedSaga 
annotation. Invoking a method marked with this annotation will start a new Saga 
whose outcome depends upon whether the enclosing Saga is closed or cancelled.

* If the nested Saga is closed but the outer Saga is cancelled then the 
participants registered with the nested Saga will be told to compensate.

* If the nested Saga is cancelled the outer Saga can be still closed.


> Support the nesting SagaStart
> -----------------------------
>
>                 Key: SCB-836
>                 URL: https://issues.apache.org/jira/browse/SCB-836
>             Project: Apache ServiceComb
>          Issue Type: Improvement
>          Components: Saga
>            Reporter: Willem Jiang
>            Priority: Major
>
> We can take the 
> [nesting-lras|https://github.com/eclipse/microprofile-lra/blob/master/spec/src/main/asciidoc/microprofile-lra-spec.adoc#323-nesting-lras]
>  from the microprofile as an example. 
> An activity can be scoped within an existing Saga using the @SagaStart 
> annotation. Invoking a method marked with this annotation will start a new 
> Saga whose outcome depends upon whether the enclosing Saga is closed or 
> cancelled.
> * If the nested Saga is closed but the outer Saga is cancelled then the 
> participants registered with the nested Saga will be told to compensate.
> * If the nested Saga is cancelled the outer Saga can be still closed.



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