README.adoc

Kafka Health Check

This library provides a kafka health check for spring boot actuator.

Usage

Add the following dependency to your pom.xml

<dependency>
    <groupId>com.deviceinsight.kafka</groupId>
    <artifactId>kafka-health-check</artifactId>
    <version>1.3.0</version>
</dependency>

In the same maven module you can configure the topic, poll timeouts, subscription timeouts and the receive timeouts in the application.yml

An example for an application.yaml is:

kafka:
  health:
    topic: health-checks
    sendReceiveTimeout: 2.5s
    pollTimeout: 200ms
    subscriptionTimeout: 5s

The values shown are the defaults.

Important

Make sure the configured health check topic exists!

@Bean
@ConfigurationProperties("kafka.health")
public KafkaHealthProperties kafkaHealthProperties() {
    return new KafkaHealthProperties();
}

@Bean
public KafkaConsumingHealthIndicator kafkaConsumingHealthIndicator(KafkaHealthProperties kafkaProperties,
        KafkaProperties processingProperties) {
    return new KafkaConsumingHealthIndicator(kafkaHealthProperties, processingProperties.buildConsumerProperties(),
            processingProperties.buildProducerProperties());
}

Now if you call the actuator endpoint actuator/health you should see the following output:

{
   "status" : "UP",
   "details" : {
      "kafkaConsuming" : {
         "status" : "UP"
      }
   }
}

Configuration

Property	Default	Description
kafka.health.topic	health-checks	Topic to subscribe to
kafka.health.sendReceiveTimeout	2.5s	The maximum time, given as Duration, to wait for sending and receiving the message.
kafka.health.pollTimeout	200ms	The time, given as Duration, spent fetching the data from the topic
kafka.health.subscriptionTimeout	5s	The maximum time, given as Duration, to wait for subscribing to topic
kafka.health.cache.maximumSize	200	Specifies the maximum number of entries the cache may contain.

Releasing

Creating a new release involves the following steps:

1. ./mvnw gitflow:release-start gitflow:release-finish

2. git push origin master

3. git push --tags

4. git push origin develop

In order to deploy the release to Maven Central, you need to create an account at https://issues.sonatype.org and configure your account in ~/.m2/settings.xml:

<settings>
  <servers>
    <server>
      <id>ossrh</id>
      <username>your-jira-id</username>
      <password>your-jira-pwd</password>
    </server>
  </servers>
</settings>

The account also needs access to the project on Maven Central. This can be requested by another project member.

Then check out the release you want to deploy (git checkout x.y.z) and run ./mvnw deploy -Prelease.