tustvold opened a new issue, #4778:
URL: https://github.com/apache/arrow-rs/issues/4778

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
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frustrated when [...] 
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   LocalFileSystem stages uploads to temporary paths ending with `#\d+`. These 
are ignored by all APIs exposed by LocalFileSystem, however, will still be 
visible to systems that interact with the filesystem directly, and will 
continue to consume disk space.
   
   In most cases these will be cleaned up automatically, however, in the event 
of a crash or an aborted future, these files will be left around
   
   **Describe the solution you'd like**
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   Some mechanism to automatically reap these files. In the abscence of some 
asynchronous drop mechanism for futures, it is unclear how this would work, but 
creating the ticket to track.
   
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