ruanwenjun edited a comment on issue #5578:
URL: 
https://github.com/apache/dolphinscheduler/issues/5578#issuecomment-852743216


   This does happen, if the two master crash at the same time(If there is only 
one master, it's easier to reproduce).
   Because currently we have multiple listeners that will listen the node 
changes.
   
https://github.com/apache/dolphinscheduler/blob/cc9e5d5d34fcf2279b267cca7df37a9e80eeba07/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/zk/ZKMasterClient.java#L217-L228
   If this listener exeucte first, it will remove the node, and will cause 
Master stop, and execute QuartzExecutors.shutdown method to close the 
datasource.
   
   The main reason is that the listener has no order.
   
   Here is a related issue #5491 and related pr #5497


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