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Using lakeFS with Boto (Python)

To use Boto with lakeFS alongside S3, check out Boto S3 Router. It will route requests to either S3 or lakeFS according to the provided bucket name.

lakeFS exposes an S3-compatible API, so you can use Boto to interact with your objects on lakeFS.

Creating a Boto client

Create a Boto3 S3 client with your lakeFS endpoint and key-pair:

import boto3
s3 = boto3.client('s3',
    endpoint_url='https://lakefs.example.com',
    aws_access_key_id='AKIAIOSFODNN7EXAMPLE',
    aws_secret_access_key='wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY')

The client is now configured to operate on your lakeFS installation.

Usage Examples

Put Object

Use a branch name and a path to put an object in lakeFS:

with open('/local/path/to/file_0', 'rb') as f:
    s3.put_object(Body=f, Bucket='example-repo', Key='main/example-file.parquet')

You can now commit this change using the lakeFS UI or CLI.

List Objects

List branch objects starting with a prefix:

list_resp = s3.list_objects_v2(Bucket='example-repo', Prefix='main/example-prefix')
for obj in list_resp['Contents']:
    print(obj['Key'])

Or, use a lakeFS commit ID to list objects for a specific commit:

list_resp = s3.list_objects_v2(Bucket='example-repo', Prefix='c7a632d74f/example-prefix')
for obj in list_resp['Contents']:
    print(obj['Key'])

Head Object

Get object metadata using branch and path:

s3.head_object(Bucket='example-repo', Key='main/example-file.parquet')
# output:
# {'ResponseMetadata': {'RequestId': '72A9EBD1210E90FA',
#  'HostId': '',
#  'HTTPStatusCode': 200,
#  'HTTPHeaders': {'accept-ranges': 'bytes',
#   'content-length': '1024',
#   'etag': '"2398bc5880e535c61f7624ad6f138d62"',
#   'last-modified': 'Sun, 24 May 2020 10:42:24 GMT',
#   'x-amz-request-id': '72A9EBD1210E90FA',
#   'date': 'Sun, 24 May 2020 10:45:42 GMT'},
#  'RetryAttempts': 0},
# 'AcceptRanges': 'bytes',
# 'LastModified': datetime.datetime(2020, 5, 24, 10, 42, 24, tzinfo=tzutc()),
# 'ContentLength': 1024,
# 'ETag': '"2398bc5880e535c61f7624ad6f138d62"',
# 'Metadata': {}}