Use one-click ingestion to create an Event Hub data connection for Azure Data Explorer

Azure Data Explorer offers ingestion (data loading) from Event Hubs, a big data streaming platform and event ingestion service. Event Hubs can process millions of events per second in near real-time. In this article, you connect an Event Hub to a table in Azure Data Explorer using the one-click ingestion experience.


Ingest new data

  1. In the left menu of the Web UI, right-click a database or table and select Ingest new data.

Select one-click ingestion in the web UI

The Ingest new data window opens with the Source tab selected.

Screenshot of source tab in ingest new data to Azure Data Explorer with source = reference to Event Hub

  1. The Database field is auto-populated with your database. You may select a different database from the drop-down menu.

  2. Under Table, select Create new and enter a name for the new table, or use an existing table.


    Table names must be between 1 and 1024 characters. You can use alphanumeric, hyphens, and underscores. Special characters aren't supported.

  3. Under Source type, select Reference to Event Hub. The data connect selection will appear.

Data connection

  1. Under Data Connection, fill in the following fields:

    Screenshot of source tab with project details fields to be filled in - ingest new data to Azure Data Explorer with Event Hub in the one click experience

    Setting Suggested value Field description
    Data connection name TestDataConnection The name that identifies your data connection.
    Subscription The subscription ID where the Event Hub resource is located.
    Event Hub namespace The name that identifies your namespace.
    Event Hub The Event Hub you wish to use.
    Consumer group The consumer group defined in your Event Hub.
    Data format Data is read from the Event Hub in form of EventData objects. Supported formats are CSV, JSON, PSV, SCsv, SOHsv TSV, and TSVE.
    Event system properties Select relevant properties The Event Hub system properties. If there are multiple records per event message, the system properties will be added to the first one. When adding system properties, create or update table schema and mapping to include the selected properties.
  2. Select Edit schema.

Schema tab

For information on schema mapping with JSON-formatted data, see Edit the schema. For information on schema mapping with CSV-formatted data, see Edit the schema.

Screenshot of schema tab in ingest new data to Azure Data Explorer with Event Hub in the one click experience

  1. If the data you see in the preview window is not complete, you may need more data to create a table with all necessary data fields. Use the following commands to fetch new data from your Event Hub:

    • Discard and fetch new data: discards the data presented and searches for new events.
    • Fetch more data: Searches for more events in addition to the events already found.


    To see a preview of your data, your Event Hub must be sending events.

  2. Select Start ingestion.

Complete data ingestion

In the Data ingestion completed window, all steps will be marked with green check marks when data ingestion finishes successfully. The cards below these steps give you options to explore your data with Quick queries, undo changes made using Tools, or Monitor the Event Hub connections and data.

Screenshot of final screen in ingestion to Azure Data Explorer from Event Hub with the one click experience

Next steps