Spring 卡夫卡 Consumer/Listener 组

Question

在消费者端指定组有什么区别

spring.kafka.consumer.group-id

与在@KafkaListener 指定相比？

@KafkaListener(topic="test", group = "test-grp")

Answer 1

请参阅 group 属性的 javadoc；它与卡夫卡无关 group.id...

/**
 * If provided, the listener container for this listener will be added to a bean
 * with this value as its name, of type {@code Collection<MessageListenerContainer>}.
 * This allows, for example, iteration over the collection to start/stop a subset
 * of containers.
 * @return the bean name for the group.
 */

这已在 1.3/2.0 中重命名 containerGroup。

那些发布版本还提供...

/**
 * Override the {@code group.id} property for the consumer factory with this value
 * for this listener only.
 * @return the group id.
 * @since 1.3
 */
String groupId() default "";

/**
 * When {@link #groupId() groupId} is not provided, use the {@link #id() id} (if
 * provided) as the {@code group.id} property for the consumer. Set to false, to use
 * the {@code group.id} from the consumer factory.
 * @return false to disable.
 * @since 1.3
 */
boolean idIsGroup() default true;

以前，您需要为每个侦听器创建一个容器 factory/consumer 工厂；这些允许您使用一个工厂实例并覆盖 group.id.

Spring 卡夫卡 Consumer/Listener 组

Spring Kafka Consumer/Listener Group

apache-kafka

spring-kafka