ruanwenjun commented on issue #6880:
URL: 
https://github.com/apache/dolphinscheduler/issues/6880#issuecomment-971214197


   Yes, this may happen in some extreme cases, if the alive master add the 
`dead` master into dead path after the `dead` master restart, then the restart 
`dead` master will kill itself again.
   
   The easy way to fix is add an atomic operation, when add an instance to dead 
path, check if it's in active path.


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