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Chapter 14. Cassandra Sink

Important

The Cassandra Sink Kamelet is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production.

These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

Send data to a Cassandra Cluster.

This Kamelet expects the body as JSON Array. The content of the JSON Array will be used as input for the CQL Prepared Statement set in the query parameter.

14.1. Configuration Options
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The following table summarizes the configuration options available for the cassandra-sink Kamelet:

Expand
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

"ANY"

 
Note

Fields marked with an asterisk (*) are mandatory.

14.2. Dependencies
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At runtime, the cassandra-sink Kamelet relies upon the presence of the following dependencies:

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

14.3. Usage
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This section describes how you can use the cassandra-sink.

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

cassandra-sink-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: cassandra-sink-binding
spec:
  source:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: cassandra-sink
    properties:
      connectionHost: "localhost"
      connectionPort: 9042
      keyspace: "customers"
      password: "The Password"
      query: "The Query"
      username: "The Username"
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14.3.1.1. Prerequisite
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Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

14.3.1.2. Procedure for using the cluster CLI
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  1. Save the cassandra-sink-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the sink by using the following command: 

    oc apply -f cassandra-sink-binding.yaml
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14.3.1.3. Procedure for using the Kamel CLI
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Configure and run the sink by using the following command: 

kamel bind channel:mychannel cassandra-sink -p "sink.connectionHost=localhost" -p sink.connectionPort=9042 -p "sink.keyspace=customers" -p "sink.password=The Password" -p "sink.query=Query" -p "sink.username=The Username"
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This command creates the KameletBinding in the current namespace on the cluster.

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

cassandra-sink-binding.yaml

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

14.3.2.2. Procedure for using the cluster CLI
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  1. Save the cassandra-sink-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the sink by using the following command: 

    oc apply -f cassandra-sink-binding.yaml
    Copy to Clipboard Toggle word wrap

14.3.2.3. Procedure for using the Kamel CLI
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Configure and run the sink by using the following command: 

kamel bind kafka.strimzi.io/v1beta1:KafkaTopic:my-topic cassandra-sink -p "sink.connectionHost=localhost" -p sink.connectionPort=9042 -p "sink.keyspace=customers" -p "sink.password=The Password" -p "sink.query=The Query" -p "sink.username=The Username"
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This command creates the KameletBinding in the current namespace on the cluster.

14.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/blob/kamelet-catalog-1.6/cassandra-sink.kamelet.yaml

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