eric-lee-ltk commented on issue #158: mysql duplicate key 
URL: 
https://github.com/apache/incubator-servicecomb-saga/issues/158#issuecomment-375557533
 
 
   When multiple scanners detect the failed event and compensate at the same 
time, it needs to store the compensate command only once. This is why we 
introduce the eventId as a unique key. With this constraint, no duplicate 
compensate commands will be stored in db. 

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