juliuszsompolski commented on PR #42355:
URL: https://github.com/apache/spark/pull/42355#issuecomment-1668673016

   @hvanhovell 
   > Is the ExecuteGrpcResponseSender thread safe? For example is detach() safe?
   
   detach() is synchronized on the executeObserver it's attached to, like the 
other places in the sender... Modified the code a bit to make it more clear.
   
   > Is it possible for events to produced in a weird order?
   
   No. Execution pushes responses to executeObserver in order, there is a bunch 
of assertions that assure order of events.


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