set kafka key action Set Kafka Key Action

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Stable"

Set Kafka Key based on a specific incoming header value from the message body.

The headerName parameter allows you to specify which header value to set as Kafka Key.

Configuration Options

The following table summarizes the configuration options available for the set-kafka-key-action Kamelet:

Property Name Description Type Default Example

headerName

Field

Required The name of the header to set as Kafka Key.

string

forceHeaderDeletion

Force Header Deletion

If true, it will remove the header with name headerName from the Exchange after setting it as Kafka Key.

boolean

false

Dependencies

At runtime, the set-kafka-key-action Kamelet relies upon the presence of the following dependencies:

  • camel:kamelet

  • camel:core

Camel JBang usage

Prerequisites

  • You’ve installed JBang.

  • You have executed the following command:

jbang app install camel@apache/camel

Supposing you have a file named route.yaml with this content:

- route:
    from:
      uri: "kamelet:timer-source"
      parameters:
        period: 10000
        message: 'test'
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command

camel run route.yaml

Camel K Environment Usage

This section describes how you can use the set-kafka-key-action.

Knative action

You can use the set-kafka-key-action Kamelet as an intermediate step in a Knative binding.

set-kafka-key-action-binding.yaml
apiVersion: camel.apache.org/v1
kind: KameletBinding
metadata:
  name: set-kafka-key-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: kafka-source
      properties:
        bootstrapServers: localhost:9092
        topic: mytopic
        user: kafka
        password: kafka123!
  steps:
    - ref:
        kind: Kamelet
        apiVersion: camel.apache.org/v1
        name: set-kafka-key-action
      properties:
        headerName: The Field
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

Prerequisite

You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the set-kafka-key-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the action by using the following command:

    kubectl apply -f set-kafka-key-action-binding.yaml

Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind channel:mychannel -p "step-0.headerName=The Field" set-kafka-key-action

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

Kafka action

You can use the set-kafka-key-action Kamelet as an intermediate step in a Kafka binding.

set-kafka-key-action-binding.yaml
apiVersion: camel.apache.org/v1
kind: KameletBinding
metadata:
  name: set-kafka-key-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: kafka-source
      properties:
        bootstrapServers: localhost:9092
        topic: mytopic
        user: kafka
        password: kafka123!
  steps:
    - ref:
        kind: Kamelet
        apiVersion: camel.apache.org/v1
        name: set-kafka-key-action
      properties:
        headerName: The Field
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

Prerequisites

  • You’ve installed Strimzi.

  • You’ve created a topic named my-topic in the current namespace.

  • You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the set-kafka-key-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the action by using the following command:

    kubectl apply -f set-kafka-key-action-binding.yaml

Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind kafka.strimzi.io/v1beta1:KafkaTopic:my-topic -p "step-0.headerName=The Field" set-kafka-key-action

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

Kamelet source file

https://github.com/apache/camel-kamelets/blob/main/kamelets/set-kafka-key-action.kamelet.yaml

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