Retrying Kafka errors using #RetryableTopic - spring-kafka

Question

Is there a way to specify the dlt used when retrying with spring-kafka #RetryableTopic.
I use a listener with the following configuration :
#RetryableTopic(
attempts = "4",
backoff = #Backoff(delay = 1000),
autoCreateTopics = "false",
topicSuffixingStrategy = TopicSuffixingStrategy.SUFFIX_WITH_DELAY_VALUE,
fixedDelayTopicStrategy = FixedDelayStrategy.SINGLE_TOPIC)
#KafkaListener(topics = "${spring.kafka.template.default-topic}")
This retries using a single topic but uses my main topic +"_dlt" for exhausted retries even though I have a dead letter topic with a different name configured at :
spring:
kafka:
consumer:
template:
dead-letter-topic: its_dead_jim
I've used a DeadLetterPublishingRecoverer in the past and have implemented the dlt resolver function but I don't see a way to override the default behavior in the documentation for RetryableTopic. I've looked at RetryTopicConfigurationBuilder and RetryTopicConfigurer
but nothing seem applicable to change the DLT name.

Answer 1

I am not sure why you think there is such a property on the template.
See the documentation.
Extend RetryTopicConfigurationSupport in a #Configuration class and...
Custom naming strategies
More complex naming strategies can be accomplished by registering a bean that implements RetryTopicNamesProviderFactory. The default implementation is SuffixingRetryTopicNamesProviderFactory and a different implementation can be registered in the following way:
#Override
protected RetryTopicComponentFactory createComponentFactory() {
return new RetryTopicComponentFactory() {
#Override
public RetryTopicNamesProviderFactory retryTopicNamesProviderFactory() {
return new CustomRetryTopicNamesProviderFactory();
}
};
}
As an example the following implementation, in addition to the standard suffix, adds a prefix to retry/dl topics names:
public class CustomRetryTopicNamesProviderFactory implements RetryTopicNamesProviderFactory {
#Override
public RetryTopicNamesProvider createRetryTopicNamesProvider(
DestinationTopic.Properties properties) {
if(properties.isMainEndpoint()) {
return new SuffixingRetryTopicNamesProvider(properties);
}
else {
return new SuffixingRetryTopicNamesProvider(properties) {
#Override
public String getTopicName(String topic) {
return "my-prefix-" + super.getTopicName(topic);
}
};
}
}
}