[英]How multiple consumer can listen to multiple topic in spring boot Kafka?
當有多個消費者時,我無法收聽 kafka 主題(我的案例 2 主題)。 在下面的示例中,我有 2 個消費者工廠,它們將接收 2 個不同的 JSON 消息(一個是用戶類型,另一個是事件類型)。 兩條消息都發布到不同的主題。 在這里,當我嘗試從 topic1 訪問事件消息時,我無法訪問,但我可以訪問用戶主題消息。
前任:
@Configuration
@EnableKafka
public class KafkaConsumerConfiguration {
@Autowired
private Environment environment;
@Bean
public ConsumerFactory<String,User> consumerFactory() {
Map<String, Object> config = new HashMap<>();
config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, environment.getProperty("bootstrap.servers"));
config.put(ConsumerConfig.GROUP_ID_CONFIG, environment.getProperty("user.consumer.group"));
config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,JsonDeserializer.class);
return new DefaultKafkaConsumerFactory<>(config, new StringDeserializer(),
new JsonDeserializer<>(User.class));
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, User> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, User> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
@Bean
public ConsumerFactory<String , Event> consumerFactoryEvent(){
Map<String, Object> config = new HashMap<>();
config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, environment.getProperty("bootstrap.servers"));
config.put(ConsumerConfig.GROUP_ID_CONFIG, environment.getProperty("event.consumer.group"));
config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,JsonDeserializer.class);
return new DefaultKafkaConsumerFactory<>(config, new StringDeserializer(),
new JsonDeserializer<>(Event.class));
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, Event> kafkaListenerContainerFactoryEvent() {
ConcurrentKafkaListenerContainerFactory<String, Event> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactoryEvent());
return factory;
}
}
我的主要應用程序如下:
@KafkaListener(topics = "${event.topic}")
public void processEvent(Event event) {
..do something..
..post the message to User topic
}
@KafkaListener(topics = "${user.topic}")
public void processUser(User user) {
..do something..
}
我的需要是首先偵聽事件主題並對消息進行一些按摩,然后將其發送到用戶主題,我有另一種方法可以偵聽用戶主題並對該消息執行某些操作。我嘗試將不同的選項傳遞給@KafkaListener 如
@KafkaListener(topics="${event.topic}",containerFactory="kafkaListenerContainerFactoryEvent")
但它不起作用..我不確定出了什么問題..任何建議都有幫助!
如果你沒有在 bean 中指定名稱,那么方法名稱將是 bean 名稱,在@KafkaListener
添加帶有 groupid 的 bean 名稱
@KafkaListener(topics="${event.topic}",containerFactory="kafkaListenerContainerFactoryEvent", groupId="")
@KafkaListener(topics="${event.topic}",containerFactory="kafkaListenerContainerFactory", groupId="")
或者
在@Bean
指定名稱並將該名稱添加到@kafkaListener
@Bean(name="kafkaListenerContainerFactoryEvent")
public ConcurrentKafkaListenerContainerFactory<String, Event> kafkaListenerContainerFactoryEvent() {
ConcurrentKafkaListenerContainerFactory<String, Event> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactoryEvent());
return factory;
}
它在任何文檔中都不容易獲得。
這里我以消費消息為例
topic=topic1 和 bootstrapserver=url1(JSON 序列化器和反序列化器)
topic=topic2 和 bootstrapserver=url2(Avro Serializer 和 Deserializer)
第1步:-
@Bean
public ConsumerFactory<String, String> consumerFactory1() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
"localhost1:9092"); //This is dummy
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean
public ConsumerFactory consumerFactory2() {
Map props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
"localhost2:9092"); //This is dummy
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, KafkaAvroDeserializer.class);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put("schema.registry.url", "https://abc.schemaregistery.example.com"); //Again this is dummy or can be avro serilaised class
return new DefaultKafkaConsumerFactory<>(props);
}
@Bean(name = "kafkaListenerContainerFactory1")
public ConcurrentKafkaListenerContainerFactory
kafkaListenerContainerFactory1() {
ConcurrentKafkaListenerContainerFactory<String, String> factory
= new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory1());
return factory;
}
@Bean(name = "kafkaListenerContainerFactory2")
public ConcurrentKafkaListenerContainerFactory
kafkaListenerContainerFactory2() {
ConcurrentKafkaListenerContainerFactory<String, String> factory
= new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory2());
return factory;
}
第2步:-
第三步:-
@KafkaListener(
topics = "topic1",
containerFactory = "kafkaListenerContainerFactory1" ,
groupId = "com.groupid1")
public void receive(ConsumerRecord consumerRecord) throws InterruptedException {
LOGGER.info("consuming from topic1 {}" , consumerRecord.value());
Thread.sleep(1000000); //For testing
}
@KafkaListener(
topics = "topic2",
containerFactory = "kafkaListenerContainerFactory2" ,
groupId = "com.groupid2")
public void receive(ConsumerRecord consumerRecord) throws InterruptedException {
LOGGER.info("consuming from topic2 {}" , consumerRecord.value());
Thread.sleep(1000000); //For testing
}
顯然,為時已晚。 但它可能會幫助別人。
您不需要創建多個 ConsumerFactory Bean。 您可以在不通知配置中的類( User
或Event
)的情況下執行此操作,即new JsonDeserializer<>(Event.class)
並添加受信任的包。
@Bean
public ConsumerFactory<String,User> consumerFactory() {
Map<String, Object> config = new HashMap<>();
config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, environment.getProperty("bootstrap.servers"));
config.put(ConsumerConfig.GROUP_ID_CONFIG, environment.getProperty("user.consumer.group"));
config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,JsonDeserializer.class);
// TODO: Remove "*" and add specific package name
config.put(JsonDeserializer.TRUSTED_PACKAGES, "*"); // <<-- New config added
return new DefaultKafkaConsumerFactory<>(config);
}
在接收記錄時:
@KafkaListener(topics="${event.topic}")
void receiveUserRecord(User record){ ... } # For User POJO
@KafkaListener(topics="${event.topic}")
void receiveEventRecord(Event record){ ... } # For Event POJO
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