paleolimbot commented on PR #14250:
URL: https://github.com/apache/arrow/pull/14250#issuecomment-1261000147

   I updated #13635 so that it just warns here instead of erroring. The gist of 
that is that the `StopSource()` that I have saved is not null; however, calling 
`RegisterCancellingSignalHandler()` errors saying that it is not set up.
   
   If the stop token didn't live with the filesystem it probably wouldn't be an 
issue because the process in general would never be forked before a cancellable 
operation was invoked (although I'm sure somebody will try to use `mclapply()` 
in a user-defined function at some point, so it should still probably not 
error).


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