Apache kafka Spring Kafka消费者/听众组

在消费者处指定组有什么区别

spring.kafka.consumer.group-id

vs在@KafkaListener处指定

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

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查看javadocs了解

组

属性；它与卡夫卡

group.id

无关

/**
 * 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.
 */

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以前，每个侦听器都需要一个容器工厂/消费者工厂；这些允许您使用一个factory实例并覆盖

组.id

谢谢@Gary Russel。我已经看过文件了，但不清楚。“以前，每个侦听器都需要一个容器工厂/使用者工厂；这允许您使用一个工厂实例并覆盖group.id。”这一澄清帮助了我。

/**
 * 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;