sandugood opened a new pull request, #2107:
URL: https://github.com/apache/datafusion-ballista/pull/2107

   # Which issue does this PR close?
   
   Closes #2105.
   
    # Rationale for this change
   Before this fix, `Executor` process would hang indefinitely, though sending 
a stoppage signal to the Scheduler.
   It was due to the fact that there were pending cloned instances of 
`notify_shutdown` field of the `ShutdownNotifier` struct
   
   # What changes are included in this PR?
   This fix introduces an explicit `.send() `call of the `notify_shutdown` 
field, which is essentially a `broadcast::Sender(),` which is used by 
`Shutdown` struct
   
   # Are there any user-facing changes?
   No
   
   


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