DarkKirb opened a new issue, #439:
URL: https://github.com/apache/arrow-rs-object-store/issues/439

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   I am trying to perform a multipart upload from a client calling into my 
server application which wraps around object-store. The protocol is stateless, 
and the server is multithreaded.
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   **Describe the solution you'd like**
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   A `Sync` trait bound on the `MultipartUpload` trait, or an additional method 
on `ObjectStore` that returns a `Box<dyn MultipartUpload + Sync>`.
   
   **Describe alternatives you've considered**
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   Upload each chunk as a separate file on the backend, and then once the 
upload is complete, reassemble it into one big file. This works, but has 
obvious file size limitations when trying to finalize the upload inside of the 
request deadline of 10s
   
   **Additional context**
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