Azure Cosmos DB Source Connector

Type

source

Class

com.azure.cosmos.kafka.connect.source.CosmosDBSourceConnector

Target System

Azure Cosmos DB

Maintainer

Microsoft

License

MIT License

Project

github.com/microsoft/kafka-connect-cosmosdb

Download

GitHub Releases

This page documents version 1.19.0. Newer versions should be compatible unless there are breaking changes, but field names or default values may differ. If you notice discrepancies, please contact Axual Support.

Description

The Azure Cosmos DB Source Connector reads documents from an Azure Cosmos DB container and publishes them as records to Kafka topics.

It is maintained by Microsoft as part of the open-source github.com/microsoft/kafka-connect-cosmosdb.

Features

  • Stream documents from Azure Cosmos DB containers to Kafka topics

  • Topic-to-container mapping via configurable topicmap

  • Supports JSON record formats

When to Use

  • You need to ingest Azure Cosmos DB documents into Kafka for downstream processing.

  • You want to replicate Cosmos DB changes into Kafka topics.

When NOT to Use

Installation

The connector is available from the GitHub Releases.

  1. Navigate to the releases page and select the version matching your Kafka Connect installation.

  2. Download the JAR file.

For how a plugin reaches the workers, see Configure plugins.

Configuration

For the complete configuration reference, see the official source connector documentation.

To configure a connector in Axual Self-Service, see Starting Connectors.

Getting Started

Prerequisites

Azure Cosmos DB account

  • You already have an Azure Cosmos DB Account.

  • You have an Azure Cosmos DB container (e.g. cosmosdb-testing) with documents to ingest.

  • You have access to the master key (Azure Cosmos DB primary key).

Axual stream

The stream where the connector will produce events must already exist in Axual Self-Service. See Creating topics if you need to create it.

Steps

Step 1 — Create a connector application

  1. Follow the Creating topics documentation in order to create one stream and deploy it onto an environment.
    The name of the stream will be apparels.
    The key/value types will be JSON/JSON.

  2. Follow the Configure and install a connector documentation to set up a new Connector-Application.
    Let’s call it my-custom-cosmosdb-instance.
    The plugin name is com.azure.cosmos.kafka.connect.source.CosmosDBSourceConnector.
    If a plugin isn’t available, ask a platform operator to install it on the cluster. A newly installed plugin stays unavailable until someone runs refresh the cluster’s plugin list.

Step 2 — Configure the connector

  1. Provide the following minimal configuration:

    key.converter

    org.apache.kafka.connect.json.JsonConverter

    topics

    apparels

    value.converter

    org.apache.kafka.connect.json.JsonConverter

    connect.cosmos.connection.endpoint

    https://<cosmosinstance-name>.documents.azure.com:443/

    connect.cosmos.master.key

    Insert Azure CosmosDB Master Key

    connect.cosmos.containers.topicmap

    Format is topic#containername. Example: apparels#cosmosdbtesting

    connect.cosmos.databasename

    Insert name of database. Example: cosmosdbtesting

    For advanced options, see the official source connector documentation.

  2. Authorize the my-custom-cosmosdb-instance source Connector-Application to produce to the apparels stream.

Step 3 — Start the connector

Start the connector application from Axual Self-Service.

Step 4 — Verify

In Axual Self-Service, use stream-browse on the apparels stream to confirm documents from Cosmos DB are arriving as events.

Cleanup

When you are done:

  1. Stop the connector application in Axual Self-Service.

  2. Remove stream access for the application if no longer needed.

  3. Return to Azure and delete your service account and container.

Known limitations

  • The connector produces JSON-formatted Kafka records.

Examples

Minimal configuration

{
  "name": "my-cosmosdb-source",
  "config": {
    "connector.class": "com.azure.cosmos.kafka.connect.source.CosmosDBSourceConnector",
    "key.converter": "org.apache.kafka.connect.json.JsonConverter",
    "topics": "apparels",
    "value.converter": "org.apache.kafka.connect.json.JsonConverter",
    "connect.cosmos.connection.endpoint": "https://my-cosmos-instance.documents.azure.com:443/",
    "connect.cosmos.master.key": "<your-cosmos-master-key>",
    "connect.cosmos.containers.topicmap": "apparels#cosmosdbtesting",
    "connect.cosmos.databasename": "cosmosdbtesting"
  }
}

License

Azure Cosmos DB source connector is licensed under the MIT license.