[GitHub] [arrow] wjones127 commented on pull request #35808: GH-34363: [C++] Use equal size parts in S3 upload for R2 compatibility

["wjones127 (via GitHub)" <gi...@apache.org>]

wjones127 commented on PR #35808:
URL: https://github.com/apache/arrow/pull/35808#issuecomment-1566303323

   ✅ I've tested this locally against S3 and R2 with the following script:
   
   ```python
   import pyarrow.fs as pa_fs
   import os
   
   # 25 MB across 7 pieces
   pieces = 7
   piece_size = 25 * 1024 * 1024 // pieces
   
   bucket_name = os.environ["OBJECT_STORE_BUCKET"]
   
   fs = pa_fs.S3FileSystem(
       access_key=os.environ["AWS_ACCESS_KEY_ID"],
       secret_key=os.environ["AWS_SECRET_ACCESS_KEY"],
       endpoint_override=os.environ.get("OBJECT_STORE_AWS_ENDPOINT"),
       region="us-west-2",
   )
   
   with fs.open_output_stream(f"{bucket_name}/my_test_file.txt") as f:
       for i in range(pieces):
           f.write(b"0" * piece_size)
   
   info = fs.get_file_info(f"{bucket_name}/my_test_file.txt")
   assert info.size == piece_size * pieces
   ```


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