作为 Kafka Producer 急切地连接到主题

Question

I'm implementing a service which sends messages to a downstream service via a Kafka topic. This will only happen when my service's API is called, which is likely to be infrequently, at least at first.

I've found that the reactive Kafka producer API connects to Kafka lazily, which I'm sure is great for most use-cases, but I'd like to know that my Kafka connection configuration is correct at the point I deploy my service. I don't want to have to wait for the first API call only to find out that something somewhere is wrong.

The solution I've got for this at the moment is simply to send an initialisation message to the topic at start-up, but this feels clunky. Is there anything better I can be doing to force an initial connection to the topic, or at least to validate the connection configuration?

val response = kafkaSender.send(Mono.just(initialise))
        .next()
        .block();

if (response == null) {
    throw new RuntimeException("empty Mono from Kafka initialisation");
}

if (response.exception() != null) {
    throw propagate(response.exception());
}

Answer 1

如果您不想通过生产者发送心跳，您可以使用 AdminClient API 来描述您将要使用的集群或主题