Kafka Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

Receive data from Kafka topics.

Configuration Options

The following table summarizes the configuration options available for the kafka-source Kamelet:

Property	Name	Description	Type	Default	Example
bootstrapServers	Bootstrap Servers	Required Comma separated list of Kafka Broker URLs.	string
password	Password	Required Password to authenticate to kafka.	string
topic	Topic Names	Required Comma separated list of Kafka topic names.	string
user	Username	Required Username to authenticate to Kafka.	string
allowManualCommit	Allow Manual Commit	Whether to allow doing manual commits.	boolean	false
autoCommitEnable	Auto Commit Enable	If true, periodically commit to ZooKeeper the offset of messages already fetched by the consumer.	boolean	true
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
consumerGroup	Consumer Group	A string that uniquely identifies the group of consumers to which this source belongs.	string		my-group-id
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
saslMechanism	SASL Mechanism	The Simple Authentication and Security Layer (SASL) Mechanism used.	string	PLAIN
securityProtocol	Security Protocol	Protocol used to communicate with brokers. SASL_PLAINTEXT, PLAINTEXT, SASL_SSL and SSL are supported.	string	SASL_SSL

Property

Name

Description

Type

Default

Example

bootstrapServers

Bootstrap Servers

Required Comma separated list of Kafka Broker URLs.

string

password

Password

Required Password to authenticate to kafka.

string

topic

Topic Names

Required Comma separated list of Kafka topic names.

string

user

Username

Required Username to authenticate to Kafka.

string

allowManualCommit

Allow Manual Commit

Whether to allow doing manual commits.

boolean

false

autoCommitEnable

Auto Commit Enable

If true, periodically commit to ZooKeeper the offset of messages already fetched by the consumer.

boolean

true

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

consumerGroup

Consumer Group

A string that uniquely identifies the group of consumers to which this source belongs.

string

my-group-id

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

saslMechanism

SASL Mechanism

The Simple Authentication and Security Layer (SASL) Mechanism used.

string

PLAIN

securityProtocol

Security Protocol

Protocol used to communicate with brokers. SASL_PLAINTEXT, PLAINTEXT, SASL_SSL and SSL are supported.

string

SASL_SSL

Dependencies

At runtime, the kafka-source Kamelet relies upon the presence of the following dependencies:

camel:kafka
camel:kamelet

Usage

This section describes how you can use the kafka-source.

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 Bootstrap Servers
      password: The Password
      topic: The Topic Names
      user: The Username
  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

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:
```
kubectl apply -f kafka-source-binding.yaml
```

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind kafka-source -p "source.bootstrapServers=The Bootstrap Servers" -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.

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 Bootstrap Servers
      password: The Password
      topic: The Topic Names
      user: The Username
  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

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:
```
kubectl apply -f kafka-source-binding.yaml
```

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind kafka-source -p "source.bootstrapServers=The Bootstrap Servers" -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.

Kamelet source file

https://github.com/apache/camel-kamelets/blob/main/kamelets/kafka-source.kamelet.yaml