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https://issues.apache.org/jira/browse/ARROW-9775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192096#comment-17192096
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Antoine Pitrou commented on ARROW-9775:
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It seems it can be determined through a HEAD request on a bucket:
https://github.com/aws/aws-cli/issues/2431
This is how boto does it:
https://github.com/boto/botocore/pull/936/files
A S3Client is bound to a region, so some care will be needed in the
implementation.
> [C++] Automatic S3 region selection
> -----------------------------------
>
> Key: ARROW-9775
> URL: https://issues.apache.org/jira/browse/ARROW-9775
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++, Python
> Environment: macOS, Linux.
> Reporter: Sahil Gupta
> Priority: Major
> Labels: filesystem
> Fix For: 2.0.0
>
>
> Currently, PyArrow and ArrowCpp need to be provided the region of the S3
> file/bucket, else it defaults to using 'us-east-1'. Ideally, PyArrow and
> ArrowCpp can automatically detect the region and get the files, etc. For
> instance, s3fs and boto3 can read and write files without having to specify
> the region explicitly. Similar functionality to auto-detect the region would
> be great to have in PyArrow and ArrowCpp.
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