OpenMetadata/openmetadata-docs/content/v1.2.x-SNAPSHOT/connectors/database/deltalake/index.md

title	slug
DeltaLake	/connectors/database/deltalake

Delta Lake

{% multiTablesWrapper %}

Feature	Status
Stage	PROD
Metadata	{% icon iconName="check" /%}
Query Usage	{% icon iconName="cross" /%}
Data Profiler	{% icon iconName="cross" /%}
Data Quality	{% icon iconName="cross" /%}
Lineage	Partially via Views
DBT	{% icon iconName="check" /%}
Supported Versions	--

Feature	Status
Lineage	Partially via Views
Table-level	{% icon iconName="check" /%}
Column-level	{% icon iconName="check" /%}

{% /multiTablesWrapper %}

In this section, we provide guides and references to use the Deltalake connector.

Configure and schedule Deltalake metadata and profiler workflows from the OpenMetadata UI:

• Requirements
• Metadata Ingestion
• dbt Integration

{% partial file="/v1.2/connectors/ingestion-modes-tiles.md" variables={yamlPath: "/connectors/database/deltalake/yaml"} /%}

Requirements

{%inlineCallout icon="description" bold="OpenMetadata 0.12 or later" href="/deployment"%} To deploy OpenMetadata, check the Deployment guides. {%/inlineCallout%}

Metadata Ingestion

{% partial file="/v1.2/connectors/metadata-ingestion-ui.md" variables={ connector: "Deltalake", selectServicePath: "/images/v1.2/connectors/deltalake/select-service.png", addNewServicePath: "/images/v1.2/connectors/deltalake/add-new-service.png", serviceConnectionPath: "/images/v1.2/connectors/deltalake/service-connection.png", } /%}

{% stepsContainer %} {% extraContent parentTagName="stepsContainer" %}

Connection Details

• Metastore Host Port: Enter the Host & Port of Hive Metastore Service to configure the Spark Session. Either of metastoreHostPort, metastoreDb or metastoreFilePath is required.
• Metastore File Path: Enter the file path to local Metastore in case Spark cluster is running locally. Either of metastoreHostPort, metastoreDb or metastoreFilePath is required.
• Metastore DB: The JDBC connection to the underlying Hive metastore DB. Either of metastoreHostPort, metastoreDb or metastoreFilePath is required.
• appName (Optional): Enter the app name of spark session.
• Connection Arguments (Optional): Key-Value pairs that will be used to pass extra config elements to the Spark Session builder.

We are internally running with pyspark 3.X and delta-lake 2.0.0. This means that we need to consider Spark configuration options for 3.X.

Metastore Host Port

When connecting to an External Metastore passing the parameter Metastore Host Port, we will be preparing a Spark Session with the configuration

.config("hive.metastore.uris", "thrift://{connection.metastoreHostPort}") 

Then, we will be using the catalog functions from the Spark Session to pick up the metadata exposed by the Hive Metastore.

Metastore File Path

If instead we use a local file path that contains the metastore information (e.g., for local testing with the default metastore_db directory), we will set

.config("spark.driver.extraJavaOptions", "-Dderby.system.home={connection.metastoreFilePath}") 

To update the Derby information. More information about this in a great SO thread.

• You can find all supported configurations here
• If you need further information regarding the Hive metastore, you can find it here, and in The Internals of Spark SQL book.

Metastore Database

You can also connect to the metastore by directly pointing to the Hive Metastore db, e.g., jdbc:mysql://localhost:3306/demo_hive.

Here, we will need to inform all the common database settings (url, username, password), and the driver class name for JDBC metastore.

You will need to provide the driver to the ingestion image, and pass the classpath which will be used in the Spark Configuration under sparks.driver.extraClassPath.

{% partial file="/v1.2/connectors/database/advanced-configuration.md" /%}

{% /extraContent %}

{% partial file="/v1.2/connectors/test-connection.md" /%}

{% partial file="/v1.2/connectors/database/configure-ingestion.md" /%}

{% partial file="/v1.2/connectors/ingestion-schedule-and-deploy.md" /%}

{% /stepsContainer %}

{% partial file="/v1.2/connectors/troubleshooting.md" /%}

{% partial file="/v1.2/connectors/database/related.md" /%}