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Chapter 15. Cassandra Source
The Cassandra Source 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.
Query a Cassandra cluster table.
15.1. Configuration Options
The following table summarizes the configuration options available for the cassandra-source Kamelet:
| Property | Name | Description | Type | Default | Example |
|---|---|---|---|---|---|
| connectionHost * | Connection Host | Hostname(s) cassandra server(s). Multiple hosts can be separated by comma. | string |
| |
| connectionPort * | Connection Port | Port number of cassandra server(s) | string |
| |
| keyspace * | Keyspace | Keyspace to use | string |
| |
| 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 |
| |
| resultStrategy | Result Strategy | The strategy to convert the result set of the query. Possible values are ALL, ONE, LIMIT_10, LIMIT_100… | string |
|
Fields marked with an asterisk (*) are mandatory.
15.2. Dependencies
At runtime, the cassandra-source Kamelet relies upon the presence of the following dependencies:
- camel:jackson
- camel:kamelet
- camel:cassandraql
15.3. Usage
This section describes how you can use the cassandra-source.
15.3.1. 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
15.3.1.1. Prerequisite
Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.
15.3.1.2. Procedure for using the cluster CLI
-
Save the
cassandra-source-binding.yamlfile to your local drive, and then edit it as needed for your configuration. Run the source by using the following command:
oc apply -f cassandra-source-binding.yaml
15.3.1.3. 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.
15.3.2. 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
15.3.2.1. 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.
15.3.2.2. Procedure for using the cluster CLI
-
Save the
cassandra-source-binding.yamlfile to your local drive, and then edit it as needed for your configuration. Run the source by using the following command:
oc apply -f cassandra-source-binding.yaml
15.3.2.3. 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.
