> ## Documentation Index
> Fetch the complete documentation index at: https://docs.streamnative.io/llms.txt
> Use this file to discover all available pages before exploring further.

> The Cassandra sink connector pulls messages from Pulsar topics to Cassandra clusters

# Cassandra sink

The Cassandra sink connector pulls messages from Pulsar topics to Cassandra clusters.

# Configuration

The configuration of the Cassandra sink connector has the following properties.

## Property

| Name           | Type   | Required | Default            | Description                                                                                                                                                                                                         |
| -------------- | ------ | -------- | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `roots`        | String | true     | " " (empty string) | A comma-separated list of Cassandra hosts to connect to.                                                                                                                                                            |
| `keyspace`     | String | true     | " " (empty string) | The key space used for writing pulsar messages. <br /><br />**Note: `keyspace` should be created prior to a Cassandra sink.**                                                                                       |
| `keyname`      | String | true     | " " (empty string) | The key name of the Cassandra column family. <br /><br />The column is used for storing Pulsar message keys. <br /><br />If a Pulsar message doesn't have any key associated, the message value is used as the key. |
| `columnFamily` | String | true     | " " (empty string) | The Cassandra column family name.<br /><br />**Note: `columnFamily` should be created prior to a Cassandra sink.**                                                                                                  |
| `columnName`   | String | true     | " " (empty string) | The column name of the Cassandra column family.<br /><br /> The column is used for storing Pulsar message values.                                                                                                   |

## Example

Before using the Cassandra sink connector, you need to create a configuration file through one of the following methods.

* JSON

  ```json theme={null}
  {
      "roots": "localhost:9042",
      "keyspace": "pulsar_test_keyspace",
      "columnFamily": "pulsar_test_table",
      "keyname": "key",
      "columnName": "col"
  }
  ```

* YAML

  ```
  configs:
      roots: "localhost:9042"
      keyspace: "pulsar_test_keyspace"
      columnFamily: "pulsar_test_table"
      keyname: "key"
      columnName: "col"
  ```

# Usage

For more information about **how to connect Pulsar with Cassandra**, see [here](https://pulsar.apache.org/docs/en/next/io-quickstart/#connect-pulsar-to-cassandra).