如何在 2.5.4 版本中发布 Spring Kafka DLQ

Question

需要您的帮助和指导。

我在当前项目中使用的是 2.2.X 版本的 spring-kafka。

我创建的错误处理如下所示：

@Bean("kafkaConsumer")
public ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> eventKafkaConsumer() {
    ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setErrorHandler(new SeekToCurrentErrorHandler(createDeadLetterPublishingRecoverer(), 3));
    return factory;
}

public DeadLetterPublishingRecoverer createDeadLetterPublishingRecoverer() {
    return new DeadLetterPublishingRecoverer(getEventKafkaTemplate(),
            (record, ex) -> new TopicPartition("topic-undelivered", -1));
}

然后我将我所有的项目依赖版本，例如 spring-boot 和 spring-kafka 升级到最新版本： 2.5.4 RELEASE

我发现其中一些方法已被弃用和更改。

SeekToCurrentErrorHandler

SeekToCurrentErrorHandler errorHandler =
new SeekToCurrentErrorHandler((record, exception) -> {
    // recover after 3 failures, woth no back off - e.g. send to a dead-letter topic
}, new FixedBackOff(0L, 2L));

我的问题是，如何使用这些配置生成 DLQ：

已编辑

@Bean("kafkaConsumer")
public ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> kafkaConsumer() {
    ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    factory.setConcurrency(consumerConcurrencyCount);
    factory.setErrorHandler(errorHandler());
    return factory;
}

public SeekToCurrentErrorHandler errorHandler() {
    return new SeekToCurrentErrorHandler(
            deadLetterPublishingRecoverer(),
            new FixedBackOff(0L, 2L)
    );
}

public DeadLetterPublishingRecoverer deadLetterPublishingRecoverer() {
    return new DeadLetterPublishingRecoverer(
            getEventKafkaTemplate(),
            (record, ex) -> {
                if (ex.getCause() instanceof BusinessException || ex.getCause() instanceof TechnicalException) {
                    return new TopicPartition("topic-undelivered", -1);
                }

                return new TopicPartition("topic-fail", -1);
            });
}

public KafkaOperations<String, Object> getEventKafkaTemplate() { // producer to DLQ
    return new KafkaTemplate<>(new DefaultKafkaProducerFactory<>(producerConfigs()));
}

感谢 Gary，此配置有效！

提前致谢

Answer 1

不清楚你的意思是什么

问题是，在文档中，它仍在使用旧方法，该方法已被 2.5.X 版本弃用

KafkaOperations是KafkaTemplate实现的接口； 您需要做的唯一更改是将maxAttempts更改为BackOff ...

@Bean("kafkaConsumer")
public ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> eventKafkaConsumer() {
    ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setErrorHandler(new SeekToCurrentErrorHandler(createDeadLetterPublishingRecoverer(), new FixedBackOff(0, 2L));
    return factory;
}

public DeadLetterPublishingRecoverer createDeadLetterPublishingRecoverer() {
    return new DeadLetterPublishingRecoverer(getEventKafkaTemplate(),
            (record, ex) -> new TopicPartition("topic-undelivered", -1));
}