FileStore

Artikkeli
05/18/2024

Important

This documentation has been retired and might not be updated. The products, services, or technologies mentioned in this content are no longer supported.

FileStore is a special folder within DBFS where you can save files and have them accessible to your web browser. You can use FileStore to:

Save files, such as images and libraries, that are accessible within HTML and JavaScript when you call displayHTML.
Save output files that you want to download to your local desktop.
Upload CSVs and other data files from your local desktop to process on Databricks.

When you use certain features, Azure Databricks puts files in the following folders under FileStore:

/FileStore/jars - contains uploaded legacy workspace libraries. If you delete files in this folder, libraries that reference these files in your workspace may no longer work.
/FileStore/tables - contains the files that you import using the UI. If you delete files in this folder, tables that you created from these files may no longer be accessible.

Important

Libraries can be installed from DBFS when using Databricks Runtime 14.3 LTS and below. However, any workspace user can modify library files stored in DBFS. To improve the security of libraries in a Azure Databricks workspace, storing library files in the DBFS root is deprecated and disabled by default in Databricks Runtime 15.1 and above. See Storing libraries in DBFS root is deprecated and disabled by default.

Instead, Databricks recommends uploading all libraries, including Python libraries, JAR files, and Spark connectors, to workspace files or Unity Catalog volumes, or using library package repositories. If your workload does not support these patterns, you can also use libraries stored in cloud object storage.

Save a file to FileStore

You can use dbutils.fs.put to write arbitrary text files to the /FileStore directory in DBFS:

dbutils.fs.put("/FileStore/my-stuff/my-file.txt", "This is the actual text that will be saved to disk. Like a 'Hello world!' example")

In the following, replace <databricks-instance> with the workspace URL of your Azure Databricks deployment.

Files stored in /FileStore are accessible in your web browser at https://<databricks-instance>/files/<path-to-file>?o=######. For example, the file you stored in /FileStore/my-stuff/my-file.txt is accessible at https://<databricks-instance>/files/my-stuff/my-file.txt?o=###### where the number after o= is the same as in your URL.

Note

You can also use the DBFS file upload interfaces to put files in the /FileStore directory. See Explore and create tables in DBFS.

Embed static images in notebooks

You can use the files/ location to embed static images into your notebooks:

displayHTML("<img src ='files/image.jpg'>")

or Markdown image import syntax:

%md
![my_test_image](files/image.jpg)

You can upload static images using the DBFS API and the requests Python HTTP library. In the following example:

Replace <databricks-instance> with the workspace URL of your Azure Databricks deployment.
Replace <token> with the value of your personal access token.
Replace <image-dir> with the location in FileStore where you want to upload the image files.

Note

As a security best practice, when you authenticate with automated tools, systems, scripts, and apps, Databricks recommends that you use personal access tokens belonging to service principals instead of workspace users. To create tokens for service principals, see Manage tokens for a service principal.

import requests
import json
import os

TOKEN = '<token>'
headers = {'Authorization': 'Bearer %s' % TOKEN}
url = "https://<databricks-instance>/api/2.0"
dbfs_dir = "dbfs:/FileStore/<image-dir>/"

def perform_query(path, headers, data={}):
  session = requests.Session()
  resp = session.request('POST', url + path, data=json.dumps(data), verify=True, headers=headers)
  return resp.json()

def mkdirs(path, headers):
  _data = {}
  _data['path'] = path
  return perform_query('/dbfs/mkdirs', headers=headers, data=_data)

def create(path, overwrite, headers):
  _data = {}
  _data['path'] = path
  _data['overwrite'] = overwrite
  return perform_query('/dbfs/create', headers=headers, data=_data)

def add_block(handle, data, headers):
  _data = {}
  _data['handle'] = handle
  _data['data'] = data
  return perform_query('/dbfs/add-block', headers=headers, data=_data)

def close(handle, headers):
  _data = {}
  _data['handle'] = handle
  return perform_query('/dbfs/close', headers=headers, data=_data)

def put_file(src_path, dbfs_path, overwrite, headers):
  handle = create(dbfs_path, overwrite, headers=headers)['handle']
  print("Putting file: " + dbfs_path)
  with open(src_path, 'rb') as local_file:
    while True:
      contents = local_file.read(2**20)
      if len(contents) == 0:
        break
      add_block(handle, b64encode(contents).decode(), headers=headers)
    close(handle, headers=headers)

mkdirs(path=dbfs_dir, headers=headers)
files = [f for f in os.listdir('.') if os.path.isfile(f)]
for f in files:
  if ".png" in f:
    target_path = dbfs_dir + f
    resp = put_file(src_path=f, dbfs_path=target_path, overwrite=True, headers=headers)
    if resp == None:
      print("Success")
    else:
      print(resp)

Scale static images

To scale the size of an image that you have saved to DBFS, copy the image to /FileStore and then resize using image parameters in displayHTML:

dbutils.fs.cp('dbfs:/user/experimental/MyImage-1.png','dbfs:/FileStore/images/')
displayHTML('''<img src="files/images/MyImage-1.png" style="width:600px;height:600px;">''')

Notebook example: Use a JavaScript library

This notebook shows how to use FileStore to contain a JavaScript library.

DBFS FileStore example notebook

Get notebook

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