fsdvh commented on issue #6460:
URL: https://github.com/apache/arrow-rs/issues/6460#issuecomment-2376758384

   I will try to provide an example of the second issue, but meanwhile, I 
thought maybe we can change the `flush` method of 
[BufWriter](https://github.com/apache/arrow-rs/blob/50e9e4927ed4d763c76227c588aa324aa173032e/object_store/src/buffered.rs#L220):
   
   ```rust
   fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> 
Poll<Result<(), Error>> {
           loop {
               return match &mut self.state {
                   BufWriterState::Write(write) => {
                       if let Some(write) = write {
                           write.poll_for_capacity(0);
                       }
                   },
                   BufWriterState::Buffer(_, _) => Poll::Ready(Ok(())),
                   BufWriterState::Flush(_) => panic!("Already shut down"),
                   BufWriterState::Prepare(f) => {
                       self.state = 
BufWriterState::Write(ready!(f.poll_unpin(cx)?).into());
                       continue;
                   }
               };
           }
       }
   ```
   
   By actually waiting for all downloads to complete we can give a user and 
ability to use `flush()` + `shutdown()`, wdyt?


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