Connect to and manage Looker in Microsoft Purview (Preview)

This article outlines how to register Looker, and how to authenticate and interact with Looker in Microsoft Purview. For more information about Microsoft Purview, read the introductory article.

Important

This feature is currently in preview. The Supplemental Terms of Use for Microsoft Azure Previews include additional legal terms that apply to Azure features that are in beta, in preview, or otherwise not yet released into general availability.

Supported capabilities

Metadata Extraction Full Scan Incremental Scan Scoped Scan Classification Access Policy Lineage Data Sharing
Yes Yes No Yes No No Yes No

The supported Looker server version is 7.2.

When scanning Looker source, Microsoft Purview supports:

  • Extracting technical metadata including:

    • Server
    • Folders
    • Projects
    • Models
    • Dashboards
    • Looks
    • Explore diagrams including the joins
    • Views including the dimensions, measures, parameters, and filters
    • Layouts including the chart layouts, table layouts, text, and fields
  • Fetching static lineage on assets relationships among views and layouts.

When setting up scan, you can choose to scan an entire Looker server, or scope the scan to a subset of Looker projects matching the given name(s).

Prerequisites

Note

If your data store is not publicly accessible (if your data store limits access from on-premises network, private network or specific IPs, etc.), you will need to configure a self hosted integration runtime to connect to it.

Register

This section describes how to register Looker in Microsoft Purview using the Microsoft Purview governance portal.

Authentication for registration

An API3 key is required to connect to the Looker server. The API3 key consists in a public client_id and a private client_secret and follows an OAuth2 authentication pattern.

Steps to register

To register a new Looker server in your data catalog, follow these steps:

  1. Navigate to your Microsoft Purview account.
  2. Select Data Map on the left navigation.
  3. Select Register.
  4. On Register sources, select Looker. Select Continue.

register looker source

On the Register sources (Looker) screen, follow these steps:

  1. Enter a Name that the data source will be listed within the Catalog.

  2. Enter the Looker API URL in the Server API URL field. The default port for API requests is port 19999. Also, all Looker API endpoints require an HTTPS connection. For example: 'https://azurepurview.cloud.looker.com'

  3. Select a collection or create a new one (Optional)

  4. Finish to register the data source.

    scan looker source

Scan

Follow the steps below to scan Looker to automatically identify assets. For more information about scanning in general, see our introduction to scans and ingestion

Create and run scan

To create and run a new scan, follow these steps:

  1. If your server is publicly accessible, skip to step two. Otherwise, you'll need to make sure your self-hosted integration runtime is configured:

    1. In the Microsoft Purview governance portal, got to the Management Center, and select Integration runtimes.
    2. Make sure a self-hosted integration runtime is available. If one isn't set up, use the steps mentioned here to set up a self-hosted integration runtime.
  2. In the Microsoft Purview governance portal, navigate to Sources.

  3. Select the registered Looker server.

  4. Select + New scan.

  5. Provide the below details:

    1. Name: The name of the scan

    2. Connect via integration runtime: Select the Azure auto-resolved integration runtime if your server is publicly accessible, or your configured self-hosted integration runtime if it isn't publicly available.

    3. Server API URL is auto populated based on the value entered during registration.

    4. Credential: While configuring Looker credential, make sure to:

      • Select Basic Authentication as the Authentication method
      • Provide your Looker API3 key's client ID in the User name field
      • Save your Looker API3 key's client secret in the key vault's secret.

      To access client ID and client secret, navigate to Looker ->Admin -> Users -> Select Edit on a user -> Select EditKeys -> Use the Client ID and Client Secret or create a new one.

      get looker details

      To understand more on credentials, refer to the link here

    5. Project filter - Scope your scan by providing a semicolon separated list of Looker projects. This option is used to select looks and dashboards by their parent project.

    6. Maximum memory available (applicable when using self-hosted integration runtime): Maximum memory (in GB) available on customer's VM to be used by scanning processes. This is dependent on the size of erwin Mart to be scanned.

      trigger scan

  6. Select Test connection (available when using self-hosted integration runtime).

  7. Select Continue.

  8. Choose your scan trigger. You can set up a schedule or ran the scan once.

  9. Review your scan and select on Save and Run.

View your scans and scan runs

To view existing scans, do the following:

  1. Go to the Microsoft Purview governance portal. Select the Data Map tab under the left pane.

  2. Select the desired data source. You will see a list of existing scans on that data source under Recent scans, or can view all scans under the Scans tab.

  3. Select the scan that has results you want to view.

  4. This page will show you all of the previous scan runs along with the status and metrics for each scan run. It will also display whether your scan was scheduled or manual, how many assets had classifications applied, how many total assets were discovered, the start and end time of the scan, and the total scan duration.

Manage your scans - edit, delete, or cancel

To manage or delete a scan, do the following:

  1. Go to the Microsoft Purview governance portal. Select the Data Map tab under the left pane.

  2. Select the desired data source. You will see a list of existing scans on that data source under Recent scans, or can view all scans under the Scans tab.

  3. Select the scan you would like to manage. You can edit the scan by selecting Edit scan.

  4. You can cancel an in progress scan by selecting Cancel scan run.

  5. You can delete your scan by selecting Delete scan.

Note

  • Deleting your scan does not delete catalog assets created from previous scans.
  • The asset will no longer be updated with schema changes if your source table has changed and you re-scan the source table after editing the description in the schema tab of Microsoft Purview.

Lineage

After scanning your Looker source, you can browse data catalog or search data catalog to view the asset details.

Go to the asset -> lineage tab, you can see the asset relationship when applicable. Refer to the supported capabilities section on the supported Looker lineage scenarios. For more information about lineage in general, see data lineage and lineage user guide.

Looker lineage view

Next steps

Now that you've registered your source, follow the below guides to learn more about Microsoft Purview and your data.