chengshiwen commented on issue #5037:
URL: 
https://github.com/apache/incubator-dolphinscheduler/issues/5037#issuecomment-797166027


   The reason of this issue is that:
   
   1. `System.exit()` will trigger JVM `ShutdownHook`, and wait for all 
`ShutdownHook` to end
   2. `ShutdownHook` call `close` method which call `System.exit()`
   3. Infinite loop occurs


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