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Chapter 69. Throttle Action

The Throttle action allows you to ensure that a specific sink does not get overloaded.

69.1. Configuration Options
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The following table summarizes the configuration options available for the throttle-action Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

messages *

Messages Number

The number of messages to send in the time period set

integer

 

10

timePeriod

Time Period

Sets the time period during which the maximum request count is valid for, in milliseconds

string

"1000"

 
Note

Fields marked with an asterisk (*) are mandatory.

69.2. Dependencies
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At runtime, the throttle-action Kamelet relies upon the presence of the following dependencies:

  • camel:core
  • camel:kamelet

69.3. Usage
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This section describes how you can use the throttle-action.

69.3.1. Knative Action
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You can use the throttle-action Kamelet as an intermediate step in a Knative binding.

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: throttle-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
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69.3.1.1. Prerequisite
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Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

69.3.1.2. Procedure for using the cluster CLI
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  1. Save the throttle-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: 

    oc apply -f throttle-action-binding.yaml
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69.3.1.3. Procedure for using the Kamel CLI
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Configure and run the action by using the following command: 

kamel bind timer-source?message=Hello --step throttle-action -p "step-0.messages=10" channel:mychannel
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This command creates the KameletBinding in the current namespace on the cluster.

69.3.2. Kafka Action
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You can use the throttle-action Kamelet as an intermediate step in a Kafka binding.

throttle-action-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: throttle-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: throttle-action
    properties:
      messages: 1
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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69.3.2.1. 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.

69.3.2.2. Procedure for using the cluster CLI
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  1. Save the throttle-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: 

    oc apply -f throttle-action-binding.yaml
    Copy to Clipboard Toggle word wrap

69.3.2.3. Procedure for using the Kamel CLI
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Configure and run the action by using the following command: 

kamel bind timer-source?message=Hello --step throttle-action -p "step-0.messages=1" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
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This command creates the KameletBinding in the current namespace on the cluster.

69.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/throttle-action.kamelet.yaml

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