steveloughran commented on pull request #30135:
URL: https://github.com/apache/spark/pull/30135#issuecomment-859463610


   > For the regression, don't know the full context behind the original change 
but seems like a good thing to do, although a boolean flag returned might be 
less disruptive IMO :). Either way it is a simple fix from Spark side.
   
   we didn't think it was going to break things. a big issue is that in come 
cases the data was being destroyed. I think partly its cleanup code which 
attempts to delete the dest file on any form of failure, so any kind of 
transient problem and the shell overreacts by destroying the source. 


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