Commits on Mar 7, 2024

1. docs: update comment about r2 requiring locks …

   Cloudflare R2 doesn't require the use of an external lock when using conditional operation headers like so:
   
   ```rust
   let s3 = AmazonS3Builder::from_env()
       .with_url(url)
       .with_region("auto")
       .with_access_key_id(&config.s3_access_key_id)
       .with_secret_access_key(&config.s3_secret_access_key)
       .with_endpoint(&config.s3_endpoint)
       // Allows using S3-API without an external locking provider since Cloudflare R2
       // provides atomic Put and Copy.
       .with_config(
           AmazonS3ConfigKey::CopyIfNotExists,
           "header: cf-copy-destination-if-none-match: *".to_string(),
       )
       .build()
   ```
   
   - https://developers.cloudflare.com/r2/api/s3/extensions/#putobject-1
   - https://github.com/apache/arrow-rs/blob/c6ba0f764a9142b74c9070db269de04d2701d112/object_store/src/aws/precondition.rs#L29-L42

   

   cmackenzie1 committed Mar 7, 2024
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