When using @KafkaListener in springboot, how to set idleBetweenPolls

Question

"idleBetweenPolls" is a handy config in spring-kafka, to adjust the rate of consumption.

However when checking source code and doc of springboot, there seems to be no mention of this props or how to propagate some particular value into org.springframework.kafka.listener.ContainerProperties.

Anyone know of anyway to achieve the above?

Answer 1

Add a container factory customizer bean:

@Component
class Customizer {

    public Customizer(ConcurrentKafkaListenerContainerFactory<?, ?> factory) {
        factory.getContainerProperties().setIdleBetweenPolls(5_000L);
    }

}

This will set it on all containers.

If you only want to set it on a specific container:

@Component
class Customizer2 {

    public Customizer2(ConcurrentKafkaListenerContainerFactory<?, ?> factory) {
        factory.setContainerCustomizer(container -> {
            if (container.getContainerProperties().getGroupId().equals("theOneIWant") {
                container.getContainerProperties().setIdleBetweenPolls(5_000L);
            }
        });
    }

}

Or, configure your own factory rather than using Boot's auto-configured factory.