Skip to main content

Running the BigQuery collector on-premise

Note

The latest version of the Collector is 2.222. To view the release notes for this version and all previous versions, please go here.

Generating the command or YAML file

This section walks you through the process of generating the command or YAML file for running the collector from Windows or Linux or MAC OS.

To generate the command or YAML file:

  1. On the Organization profile page, go to the Settings tab > Metadata collectors section.

  2. Click the Add a collector button.

    add_a_collector.png
  3. On the Choose metadata collector screen, select the correct metadata source. Click Next.

  4. On the Choose where the collector will run screen, in the On-premise section, select if you will be running the collector on Windows or Mac OS or Linux. This will determine the format of the YAML and CLI that is generated in the end. Click Next.

    select_an_os.png
  5. On the On-prem collector setup prerequisites screen, read the pre-requisites and click Next.

  6. On the Configure an on-premises BigQuery Collector screen, set the following properties and click Next.

  7. On the next screen, set the following properties and click Next.

    Table 2.

    Field name

    Corresponding parameter name

    Details

    Required?

    Big query credential file path

    --credentialFile= /creds/creds.json

    GCP service account credential file. Must match the target specified in the --mount command for credentials. For example,

     credentialFile=/creds/creds.json

    Yes

    Container Directory

    --mount type=bind,source=/ local_creds_dir ,target=/creds

    Provide the location of the credentials file you generated for authentication.

    Yes

    BigQuery Project

    -p= <project>

    --project= <project>

    The BigQuery project.

    Yes

    The BigQuery dataset(s) to catalog in the given project

    -d= <dataset>

    --dataset= <dataset>

    The BigQuery datasets to catalog in the given project. By default all datasets in a project are cataloged.

    No



  8. On the next screen, provide the Collector configuration name. This is the name used to save the configuration details. The configuration is saved and made available on the Metadata collectors summary page from where you can edit or delete the configuration at a later point. Click Save and Continue.

  9. On the Finalize your BigQuery Collector configuration screen, you are notified about the environment variables and directories you need to setup for running the collector. Select if you want to generate Configuration file ( YAML) or Command line arguments (CLI). Click Next.

  10. The next screen gives you an option to download the YAML configuration file or copy the CLI command. Click Done. If you generated a YAML file, click Next

  11. The BigQuery Collector command screen gives you the command to use for running the collector using the YAML file.

  12. You will notice that the YAML/CLI has following additional parameters that are automatically set for you.

    Important

    Except for the collector version, you should not change the values of any of the parameter listed here.

    Table 3.

    Parameter name

    Details

    Required?

    -a= <agent>

    --agent= <agent>

    --account= <agent>

    The ID for the data.world account into which you will load this catalog - this is used to generate the namespace for any URIs generated.

    Yes

    --site= <site>

    This parameter should be set only for Private instances. Do not set it for public instances and single-tenant installations. Required for private instance installations.

    Yes (required for private instance installations)

    -U

    --upload

    Whether to upload the generated catalog to the  organization account's catalogs dataset.

    Yes

    -L

    --no-log-upload

    Do not upload the log of the Collector run to the organization account's catalogs dataset.

    Yes

    dwcc: <CollectorVersion>

    The version of the collector you want to use (For example, datadotworld/dwcc:2.168)

    Yes



  13. Add the following additional parameter to test run the collector.

    • --dry-run: If specified, the collector does not actually harvest any metadata, but just checks the database connection parameters provided by the user and reports success or failure at connecting.

  14. We recommend enabling debug level logs when running the collector for the first time. This approach aids in swiftly troubleshooting any configuration and connection issues that might arise during collector runs. Add the following parameter to your collector command:

    • -e log_level=DEBUG: Enables debug level logging for collectors.

Verifying environment variables and directories

  1. Verify that you have set up all the required environment variables that were identified by the Collector Wizard before running the collector. Alternatively, you can set these credentials in a credential vault and use a script to retrieve those credentials.

  2. Verify that you have set up all the required directories that were identified by the Collector Wizard.

Running the collector using YAML file

Important

Before you begin running the collector make sure you have completed all the pre-requisite tasks.

Running collector using YAML file

  1. Go to the machine where you have setup docker to run the collector.

  2. Place the YAML file generated from the Collector wizard to the correct directory.

  3. From the command line, run the command generated from the application for executing the YAML file.

    Caution

    Note that is just a sample command for showing the syntax. You must generate the command specific to your setup from the application UI.

    docker run -it --rm --mount type=bind,source=${HOME}/dwcc,target=/dwcc-output \
      --mount type=bind,source=${HOME}/dwcc,target=/app/log --mount type=bind,source=/local_creds_dir,target=/local_creds_dir \
      -e DW_AUTH_TOKEN=${DW_AUTH_TOKEN} datadotworld/dwcc:2.124 --config-file=/dwcc-output/config-bigquery.yml
  4. The collector automatically uploads the file to the specified dataset and you can also find the output at the location you specified while running the collector.

  5. If you decide in the future that you want to run the collector using an updated version, simply modify the collector version in the provided command. This will allow you to run the collector with the latest version.

Running collector without the YAML file

  1. Go to the machine where you have setup docker to run the collector.

  2. From the command line, run the command generated from the application. Here is a sample command.

    Caution

    Note that is just a sample command for showing the syntax. You must generate the command specific to your setup from the application UI.

    docker run -it --rm --mount type=bind,source=${HOME}/dwcc,target=/dwcc-output \
      --mount type=bind,source=${HOME}/dwcc,target=/app/log --mount type=bind,source=/local_creds_dir,target=/local_creds_dir \
      datadotworld/dwcc:2.124 catalog-bigquery --agent=8bank-catalog-sources \
      --site=solutions --no-log-upload=false --upload=true --api-token=${DW_AUTH_TOKEN} \
      --output=/dwcc-output --name=8bank-catalog-sources-collection \
      --upload-location=ddw-catalogs --credentialFile=/local_creds_dir/creds.json \
      --project=8bank-project
  3. The collector automatically uploads the file to the specified dataset and you can also find the output at the location you specified while running the collector.

  4. If you decide in the future that you want to run the collector using an updated version, simply modify the collector version in the provided command. This will allow you to run the collector with the latest version.

Automating updates to your metadata catalog

Maintaining an up-to-date metadata catalog is crucial and can be achieved by employing Azure Pipelines, CircleCI, or any automation tool of your preference to execute the catalog collector regularly.

There are two primary strategies for setting up the collector run times:

  • Scheduled: You can configure the collector according to the anticipated frequency of metadata changes in your data source and the business need to access updated metadata. It's necessary to account for the completion time of the collector run (which depends on the size of the source) and the time required to load the collector's output into your catalog. This could be for instance daily or weekly. We recommend scheduling the collector run during off-peak times for optimal performance.

  • Event-triggered: If you have set up automations that refresh the data in a source technology, you can set up the collector to execute whenever the upstream jobs are completed successfully. For example, if you're using Airflow, Github actions, dbt, etc., you can configure the collector to automatically run and keep your catalog updated following modifications to your data sources.

Managing collector runs and configuration details