Chapter 16. Cassandra Source

Query a Cassandra cluster table.

16.1. Configuration Options

The following table summarizes the configuration options available for the cassandra-source Kamelet:

PropertyNameDescriptionTypeDefaultExample

connectionHost *

Connection Host

Hostname(s) cassandra server(s). Multiple hosts can be separated by comma.

string

 

"localhost"

connectionPort *

Connection Port

Port number of cassandra server(s)

string

 

9042

keyspace *

Keyspace

Keyspace to use

string

 

"customers"

password *

Password

The password to use for accessing a secured Cassandra Cluster

string

  

query *

Query

The query to execute against the Cassandra cluster table

string

  

username *

Username

The username to use for accessing a secured Cassandra Cluster

string

  

consistencyLevel

Consistency Level

Consistency level to use. The value can be one of ANY, ONE, TWO, THREE, QUORUM, ALL, LOCAL_QUORUM, EACH_QUORUM, SERIAL, LOCAL_SERIAL, LOCAL_ONE

string

"QUORUM"

 

resultStrategy

Result Strategy

The strategy to convert the result set of the query. Possible values are ALL, ONE, LIMIT_10, LIMIT_100…​

string

"ALL"

 
Note

Fields marked with an asterisk (*) are mandatory.

16.2. Dependencies

At runtime, the cassandra-source Kamelet relies upon the presence of the following dependencies:

  • camel:jackson
  • camel:kamelet
  • camel:cassandraql

16.3. Usage

This section describes how you can use the cassandra-source.

16.3.1. Knative Source

You can use the cassandra-source Kamelet as a Knative source by binding it to a Knative object.

cassandra-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: cassandra-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: cassandra-source
    properties:
      connectionHost: "localhost"
      connectionPort: 9042
      keyspace: "customers"
      password: "The Password"
      query: "The Query"
      username: "The Username"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

16.3.1.1. Prerequisite

Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

16.3.1.2. Procedure for using the cluster CLI

  1. Save the cassandra-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command: 

    oc apply -f cassandra-source-binding.yaml

16.3.1.3. Procedure for using the Kamel CLI

Configure and run the source by using the following command: 

kamel bind cassandra-source -p "source.connectionHost=localhost" -p source.connectionPort=9042 -p "source.keyspace=customers" -p "source.password=The Password" -p "source.query=The Query" -p "source.username=The Username" channel:mychannel

This command creates the KameletBinding in the current namespace on the cluster.

16.3.2. Kafka Source

You can use the cassandra-source Kamelet as a Kafka source by binding it to a Kafka topic.

cassandra-source-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: cassandra-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: cassandra-source
    properties:
      connectionHost: "localhost"
      connectionPort: 9042
      keyspace: "customers"
      password: "The Password"
      query: "The Query"
      username: "The Username"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

16.3.2.1. Prerequisites

Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

16.3.2.2. Procedure for using the cluster CLI

  1. Save the cassandra-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command: 

    oc apply -f cassandra-source-binding.yaml

16.3.2.3. Procedure for using the Kamel CLI

Configure and run the source by using the following command: 

kamel bind cassandra-source -p "source.connectionHost=localhost" -p source.connectionPort=9042 -p "source.keyspace=customers" -p "source.password=The Password" -p "source.query=The Query" -p "source.username=The Username" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

This command creates the KameletBinding in the current namespace on the cluster.

16.4. Kamelet source file

https://github.com/openshift-integration/kamelet-catalog/tree/kamelet-catalog-1.8//cassandra-source.kamelet.yaml