Snowflake assets package

The Snowflake assets package crawls Snowflake assets and publishes them to Atlan for discovery.

Information schema

Will create a new connection

This should only be used to create the workflow the first time. Each time you run this method it will create a new connection and new assets within that connection — which could lead to duplicate assets if you run the workflow this way multiple times with the same settings.

Instead, when you want to re-crawl assets, re-run the existing workflow (see Re-run existing workflow below).

1.0.0

To crawl assets from Snowflake using the built-in information schema and basic authentication:

Java Python Raw REST API

Workflow snowflake = SnowflakeCrawler.infoSchemaBasicAuth( // (1)
                "production", // (2)
                "abc123.ap-south-1.snowflakecomputing.com", // (3)
                443, // (4)
                "atlan_user", // (5)
                "gBHYwe2fXICHkbHmh7IO", // (6)
                "ACCOUNT_ADMIN", // (7)
                "COMPUTE_WH", // (8)
                List.of(RoleCache.getIdForName("$admin")), // (9)
                null,
                null,
                true, // (10)
                true, // (11)
                10000L, // (12)
                Map.of("DBT_FOOD_BEVERAGE", List.of("PUBLIC", "POSTGRES_RDS_DEMO")), // (13)
                null); // (14)
WorkflowResponse response = snowflake.run(); // (15)

1. The SnowflakeCrawler package will create a workflow to crawl assets from Snowflake. The infoSchemaBasicAuth() method creates a workflow for crawling assets directly from Snowflake using basic authentication and the built-in information schema.
2. You must provide a name for the connection that the Snowflake assets will exist within.
3. You must provide the hostname of your Snowflake instance.
4. You must specify the port number of the Snowflake instance (use 443 for the default).
5. You must provide your Snowflake username.
6. You must provide your Snowflake password.
7. You must specify the name of the Snowflake role you want to use for crawling.
8. You must specify the name of the Snowflake warehouse you want to use for crawling.

9. You must specify at least one connection admin, either:

   • everyone in a role (in this example, all $admin users)
   • a list of groups (names) that will be connection admins
   • a list of users (names) that will be connection admins

10. You can specify whether you want to allow queries to this connection (true, as in this example) or deny all query access to the connection (false).

11. You can specify whether you want to allow data previews on this connection (true, as in this example) or deny all sample data previews to the connection (false).
12. You can specify a maximum number of rows that can be accessed for any asset in the connection.
13. You can also optionally specify the set of assets to include in crawling. For Snowflake assets, this should be specified as a map keyed by database name with values as a list of schemas within that database to crawl. (If set to null, all databases and schemas will be crawled.)
14. You can also optionally specify the list of assets to exclude from crawling. For Snowflake assets, this should be specified as a map keyed by database name with values as a list of schemas within the database to exclude. (If set to null, no assets will be excluded.)

15. You can then run the workflow using the run() method on the object you've created.

    Workflows run asynchronously

    Remember that workflows run asynchronously. See the packages and workflows introduction for details on how you can check the status and wait until the workflow has been completed.

Coming soon

Create the workflow via UI only

We recommend creating the workflow only via the UI. To rerun an existing workflow, see the steps below.

Re-run existing workflow

1.0.0

To re-run an existing workflow for Snowflake assets:

Java Python Raw REST API

List<WorkflowSearchResult> existing = WorkflowSearchRequest // (1)
            .findByType(SnowflakeCrawler.PREFIX, 5); // (2)
// Determine which of the results is the Snowflake workflow you want to re-run...
WorkflowRunResponse response = existing.get(n).rerun(); // (3)

1. You can search for existing workflows through the WorkflowSearchRequest class.
2. You can find workflows by their type using the findByType() helper method and providing the prefix for one of the packages. In this example, we do so for the SnowflakeCrawler. (You can also specify the maximum number of resulting workflows you want to retrieve as results.)

3. Once you've found the workflow you want to re-run, you can simply call the rerun() helper method on the workflow search result. The WorkflowRunResponse is just a subtype of WorkflowResponse so has the same helper method to monitor progress of the workflow run.

   Workflows run asynchronously

   Remember that workflows run asynchronously. See the packages and workflows introduction for details on how you can check the status and wait until the workflow has been completed.

Coming soon

Requires multiple steps through the raw REST API

1. Find the existing workflow.
2. Send through the resulting re-run request.

{
  "from": 0,
  "size": 5,
  "query": {
    "bool": {
      "filter": [
        {
          "nested": {
            "path": "metadata",
            "query": {
              "prefix": {
                "metadata.name.keyword": {
                  "value": "atlan-snowflake" // (1)
                }
              }
            }
          }
        }
      ]
    }
  },
  "sort": [
    {
      "metadata.creationTimestamp": {
        "nested": {
          "path": "metadata"
        },
        "order": "desc"
      }
    }
  ],
  "track_total_hits": true
}

1. Searching by the atlan-snowflake prefix will ensure you only find existing Snowflake assets workflows.

   Name of the workflow

   The name of the workflow will be nested within the _source.metadata.name property of the response object. (Remember since this is a search, there could be multiple results, so you may want to use the other details in each result to determine which workflow you really want.)

{
  "namespace": "default",
  "resourceKind": "WorkflowTemplate",
  "resourceName": "atlan-snowflake-1684500411" // (1)
}

1. Send the name of the workflow as the resourceName to rerun it.

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