Download a file
This recipe downloads a file from a Unity Catalog volume using the Databricks SDK for Python.
note
Unlike notebooks, Databricks Apps does not support mounting Unity Catalog volumes and directly reading and writing files. As this code snippet demonstrates, each file needs to be downloaded to the app compute before being able to manipulate it.
Code snippet
app.py
from databricks.sdk import WorkspaceClient
w = WorkspaceClient()
download_file_path = "/Volumes/catalog/schema/volume_name/file.csv"
response = w.files.download(download_file_path)
file_data = response.contents.read()
file_name = os.path.basename(download_file_path)
Resources
Permissions
Your app service principal needs the following permissions:
USE CATALOG
on the volume's catalogUSE SCHEMA
on the volume's schemaREAD VOLUME
on the volume
See Privileges required for volume operations for more information.
Dependencies
- Databricks SDK for Python -
databricks-sdk
- Dash -
dash
requirements.txt
databricks-sdk
dash