# Druid

For context on getting started with ingestion, check out our [metadata ingestion guide](../README.md).

## Setup

To install this plugin, run `pip install 'acryl-datahub[druid]'`.

## Capabilities

| Capability | Status | Details | 
| -----------| ------ | ---- |
| Platform Instance | ✔️ | [link](../../docs/platform-instances.md) |


This plugin extracts the following:

- Metadata for databases, schemas, and tables
- Column types associated with each table
- Table, row, and column statistics via optional [SQL profiling](./sql_profiles.md)

**Note**: It is important to explicitly define the deny schema pattern for internal Druid databases (lookup & sys) if adding a schema pattern. Otherwise, the crawler may crash before processing relevant databases. This deny pattern is defined by default but is overriden by user-submitted configurations.

## Quickstart recipe

Check out the following recipe to get started with ingestion! See [below](#config-details) for full configuration options.

For general pointers on writing and running a recipe, see our [main recipe guide](../README.md#recipes).

```yml
source:
  type: druid
  config:
    # Coordinates
    host_port: "localhost:8082"

    # Credentials
    username: admin
    password: password

sink:
  # sink configs
```

## Config details

Note that a `.` is used to denote nested fields in the YAML recipe.

As a SQL-based service, the Athena integration is also supported by our SQL profiler. See [here](./sql_profiles.md) for more details on configuration.

| Field                       | Required | Default                 | Description                                                                                                                                                                             |
| --------------------------- | -------- | ----------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `username`                  |          |                         | Database username.                                                                                                                                                                      |
| `password`                  |          |                         | Database password.                                                                                                                                                                      |
| `host_port`                 | ✅       |                         | Host URL and port to connect to.                                                                                                                                                        |
| `database`                  |          |                         | Database to ingest.                                                                                                                                                                     |
| `database_alias`            |          |                         | Alias to apply to database when ingesting.                                                                                                                                              |
| `env`                       |          | `"PROD"`                | Environment to use in namespace when constructing URNs.                                                                                                                                 |
| `platform_instance`         |          | None             | The Platform instance to use while constructing URNs.         |
| `options.<option>`          |          |                         | Any options specified here will be passed to SQLAlchemy's `create_engine` as kwargs.<br />See https://docs.sqlalchemy.org/en/14/core/engines.html#sqlalchemy.create_engine for details. |
| `table_pattern.allow`       |          |                         | List of regex patterns for tables to include in ingestion.                                                                                                                              |
| `table_pattern.deny`        |          |                         | List of regex patterns for tables to exclude from ingestion.                                                                                                                            |
| `table_pattern.ignoreCase`  |          | `True`                  | Whether to ignore case sensitivity during pattern matching.                                                                                                                             |
| `schema_pattern.allow`      |          |                         | List of regex patterns for schemas to include in ingestion.                                                                                                                             |
| `schema_pattern.deny`       |          | `"^(lookup \| sys).\*"` | List of regex patterns for schemas to exclude from ingestion.                                                                                                                           |
| `schema_pattern.ignoreCase` |          | `True`                  | Whether to ignore case sensitivity during pattern matching.                                                                                                                             |
| `view_pattern.allow`        |          |                         | List of regex patterns for views to include in ingestion.                                                                                                                               |
| `view_pattern.deny`         |          |                         | List of regex patterns for views to exclude from ingestion.                                                                                                                             |
| `view_pattern.ignoreCase`   |          | `True`                  | Whether to ignore case sensitivity during pattern matching.                                                                                                                             |
| `include_tables`            |          | `True`                  | Whether tables should be ingested.                                                                                                                                                      |
| `include_views`             |          | `True`                  | Whether views should be ingested.                                                                                                                                                       |

## Compatibility

Coming soon!

## Questions

If you've got any questions on configuring this source, feel free to ping us on [our Slack](https://slack.datahubproject.io/)!