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https://issues.apache.org/jira/browse/SCB-909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16628424#comment-16628424
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ASF GitHub Bot commented on SCB-909:
------------------------------------

coveralls edited a comment on issue #315: SCB-909 Add fail fast mechanism when 
all alpha is unreachable.
URL: 
https://github.com/apache/incubator-servicecomb-saga/pull/315#issuecomment-424257835
 
 
   
   [![Coverage 
Status](https://coveralls.io/builds/19196100/badge)](https://coveralls.io/builds/19196100)
   
   Coverage increased (+0.03%) to 91.622% when pulling 
**89842ab1bc01482191cfa3f0a6f69288d553d22f on cherrylzhao:master** into 
**5350a86c0e3137db50db305d2788de2b3f357960 on apache:master**.
   

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> Add fault tolerance for service comb TCC
> ----------------------------------------
>
>                 Key: SCB-909
>                 URL: https://issues.apache.org/jira/browse/SCB-909
>             Project: Apache ServiceComb
>          Issue Type: New Feature
>          Components: Saga
>    Affects Versions: saga-0.3.0
>            Reporter: cherrylzhao
>            Assignee: cherrylzhao
>            Priority: Major
>             Fix For: saga-0.3.0
>
>
> TCC fault tolerance incude following point.
> # omega can switch to another available alpha when sending message failed.
> # if omega resend logic (different alpha) failed, omega can rollback local 
> data automatically.
> # alpha do resend logic (same omega) when ACK failed, if resend failed, dirty 
> data can left in database, this will be handled by scanner.
> # design transaction timeout mechanics, if scanner found event won't 
> completed within expected time, sending componsate command to omega, it has 
> different type compare with normal.



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