Load data into the Databricks Lakehouse
Databricks offers a variety of ways to help you load data into a lakehouse backed by Delta Lake. Databricks recommends using Auto Loader for incremental data ingestion from cloud object storage. The add data UI provides a number of options for quickly uploading local files or connecting to external data sources.
Run your first ETL workload
If you haven’t used Auto Loader on Databricks, start with a tutorial. See Run your first ETL workload on Databricks.
Auto Loader incrementally and efficiently processes new data files as they arrive in cloud storage without additional setup. Auto Loader provides a Structured Streaming source called
cloudFiles. Given an input directory path on the cloud file storage, the
cloudFiles source automatically processes new files as they arrive, with the option of also processing existing files in that directory.
Automate ETL with Delta Live Tables and Auto Loader
You can simplify deployment of scalable, incremental ingestion infrastructure with Auto Loader and Delta Live Tables. Note that Delta Live Tables does not use the standard interactive execution found in notebooks, instead emphasizing deployment of infrastructure ready for production.
Upload local data files or connect external data sources
You can securely upload local data files or ingest data from external sources to create tables. See Load data using the add data UI.
Load data into Databricks using third-party tools
Databricks validates technology partner integrations that enable you to load data into Databricks. These integrations enable low-code, scalable data ingestion from a variety of sources into Databricks. See Technology partners. Some technology partners are featured in Databricks Partner Connect, which provides a UI that simplifies connecting third-party tools to your lakehouse data.
COPY INTO allows SQL users to idempotently and incrementally load data from cloud object storage into Delta Lake tables. It can be used in Databricks SQL, notebooks, and Databricks Jobs.
When to use COPY INTO and when to use Auto Loader
Here are a few things to consider when choosing between Auto Loader and COPY INTO:
If you’re going to ingest files in the order of thousands, you can use
COPY INTO. If you are expecting files in the order of millions or more over time, use Auto Loader. Auto Loader requires fewer total operations to discover files compared to COPY INTO and can split the processing into multiple batches, meaning that Auto Loader is less expensive and more efficient at scale.
If your data schema is going to evolve frequently, Auto Loader provides better primitives around schema inference and evolution. See Configure schema inference and evolution in Auto Loader for more details.
Loading a subset of re-uploaded files can be a bit easier to manage with COPY INTO. With Auto Loader, it’s harder to reprocess a select subset of files. However, you can use COPY INTO to reload the subset of files while an Auto Loader stream is running simultaneously.
For a brief overview and demonstration of Auto Loader, as well as COPY INTO, watch this YouTube video (2 minutes).
Use Apache Spark to load data from external sources
You can connect to a variety of data sources using Apache Spark. See Interact with external data on Databricks for a list of options and examples for connecting.
Review file metadata captured during data ingestion
Apache Spark automatically captures data about source files during data loading. Databricks lets you access this data with the File metadata column.
Upload spreadsheet exports to Databricks
Use the upload data UI to upload CSV or TSV files. See Upload data to Databricks.
Migrate data applications to Databricks
Migrate existing data applications to Databricks so you can work with data from many source systems on a single platform. See Migrate data applications to Databricks.