Chapter 45. Kafka Source Receive data from Kafka topics. 45.1. Configuration Options The following table summarizes the configuration options available for the kafka-source Kamelet: Property Name Description Type Default Example topic * Topic Names Comma separated list of Kafka topic names string bootstrapServers * Brokers Comma separated list of Kafka Broker URLs string securityProtocol Security Protocol Protocol used to communicate with brokers. SASL_PLAINTEXT, PLAINTEXT, SASL_SSL and SSL are supported string "SASL_SSL" saslMechanism SASL Mechanism The Simple Authentication and Security Layer (SASL) Mechanism used. string "PLAIN" user * Username Username to authenticate to Kafka string password * Password Password to authenticate to kafka string autoCommitEnable Auto Commit Enable If true, periodically commit to ZooKeeper the offset of messages already fetched by the consumer. boolean true allowManualCommit Allow Manual Commit Whether to allow doing manual commits boolean false autoOffsetReset Auto Offset Reset What to do when there is no initial offset. There are 3 enums and the value can be one of latest, earliest, none string "latest" pollOnError Poll On Error Behavior What to do if kafka threw an exception while polling for new messages. There are 5 enums and the value can be one of DISCARD, ERROR_HANDLER, RECONNECT, RETRY, STOP string "ERROR_HANDLER" deserializeHeaders Automatically Deserialize Headers When enabled the Kamelet source will deserialize all message headers to String representation. The default is false . boolean true consumerGroup Consumer Group A string that uniquely identifies the group of consumers to which this source belongs string "my-group-id" Note Fields marked with an asterisk (*) are mandatory. 45.2. Dependencies At runtime, the `kafka-source Kamelet relies upon the presence of the following dependencies: camel:kafka camel:kamelet camel:core 45.3. Usage This section describes how you can use the kafka-source . 45.3.1. Knative Source You can use the kafka-source Kamelet as a Knative source by binding it to a Knative object. kafka-source-binding.yaml apiVersion: camel.apache.org/v1alpha1 kind: KameletBinding metadata: name: kafka-source-binding spec: source: ref: kind: Kamelet apiVersion: camel.apache.org/v1alpha1 name: kafka-source properties: bootstrapServers: "The Brokers" password: "The Password" topic: "The Topic Names" user: "The Username" sink: ref: kind: Channel apiVersion: messaging.knative.dev/v1 name: mychannel 45.3.1.1. Prerequisite Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you're connected to. 45.3.1.2. Procedure for using the cluster CLI Save the kafka-source-binding.yaml file to your local drive, and then edit it as needed for your configuration. Run the source by using the following command: oc apply -f kafka-source-binding.yaml 45.3.1.3. Procedure for using the Kamel CLI Configure and run the source by using the following command: kamel bind kafka-source -p "source.bootstrapServers=The Brokers" -p "source.password=The Password" -p "source.topic=The Topic Names" -p "source.user=The Username" channel:mychannel This command creates the KameletBinding in the current namespace on the cluster. 45.3.2. Kafka Source You can use the kafka-source Kamelet as a Kafka source by binding it to a Kafka topic. kafka-source-binding.yaml apiVersion: camel.apache.org/v1alpha1 kind: KameletBinding metadata: name: kafka-source-binding spec: source: ref: kind: Kamelet apiVersion: camel.apache.org/v1alpha1 name: kafka-source properties: bootstrapServers: "The Brokers" password: "The Password" topic: "The Topic Names" user: "The Username" sink: ref: kind: KafkaTopic apiVersion: kafka.strimzi.io/v1beta1 name: my-topic 45.3.2.1. 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. 45.3.2.2. Procedure for using the cluster CLI Save the kafka-source-binding.yaml file to your local drive, and then edit it as needed for your configuration. Run the source by using the following command: oc apply -f kafka-source-binding.yaml 45.3.2.3. Procedure for using the Kamel CLI Configure and run the source by using the following command: kamel bind kafka-source -p "source.bootstrapServers=The Brokers" -p "source.password=The Password" -p "source.topic=The Topic Names" -p "source.user=The Username" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic This command creates the KameletBinding in the current namespace on the cluster. 45.4. Kamelet source file https://github.com/openshift-integration/kamelet-catalog/kafka-source.kamelet.yaml

Commands:
apiVersion: camel.apache.org/v1alpha1 kind: KameletBinding metadata: name: kafka-source-binding spec: source: ref: kind: Kamelet apiVersion: camel.apache.org/v1alpha1 name: kafka-source properties: bootstrapServers: "The Brokers" password: "The Password" topic: "The Topic Names" user: "The Username" sink: ref: kind: Channel apiVersion: messaging.knative.dev/v1 name: mychannel
apply -f kafka-source-binding.yaml
kamel bind kafka-source -p "source.bootstrapServers=The Brokers" -p "source.password=The Password" -p "source.topic=The Topic Names" -p "source.user=The Username" channel:mychannel
apiVersion: camel.apache.org/v1alpha1 kind: KameletBinding metadata: name: kafka-source-binding spec: source: ref: kind: Kamelet apiVersion: camel.apache.org/v1alpha1 name: kafka-source properties: bootstrapServers: "The Brokers" password: "The Password" topic: "The Topic Names" user: "The Username" sink: ref: kind: KafkaTopic apiVersion: kafka.strimzi.io/v1beta1 name: my-topic
apply -f kafka-source-binding.yaml
kamel bind kafka-source -p "source.bootstrapServers=The Brokers" -p "source.password=The Password" -p "source.topic=The Topic Names" -p "source.user=The Username" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic