lidavidm commented on pull request #10025:
URL: https://github.com/apache/arrow/pull/10025#issuecomment-819573595


   Additionally, since we're handing around Executor* instead of 
shared_ptr<Executor> or something, there's still the possibility that an I/O 
thread tries to use a dangling reference, right? The main thread has to make 
sure to block and wait for all I/O threads it spawns under all conditions.


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