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kafka 延迟队列如何设置阈值

小樊
81
2024-12-14 22:19:23
栏目: 大数据

在 Kafka 中,延迟队列的实现通常依赖于第三方库,例如 kafka-delayed-message-consumerspring-kafka-delay

  1. 使用 kafka-delayed-message-consumer 库:

首先,将 kafka-delayed-message-consumer 库添加到项目的依赖中。对于 Maven 项目,可以在 pom.xml 文件中添加以下依赖:

<dependency>
    <groupId>com.github.sgroschupf</groupId>
    <artifactId>kafka-delayed-message-consumer</artifactId>
    <version>0.3.1</version>
</dependency>

接下来,创建一个消费者配置类,并设置延迟消息的阈值:

import com.github.sgroschupf.kafka.connect.delayed.DelayedMessageConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;

import java.util.HashMap;
import java.util.Map;

public class DelayedMessageConsumerConfigExample {

    public static Map<String, Object> createDelayedMessageConsumerConfig(String bootstrapServers, String groupId, long delayThreshold) {
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(DelayedMessageConsumerConfig.DELAY_MAX_MS_CONFIG, delayThreshold);
        props.put(DelayedMessageConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        return props;
    }
}

在这个例子中,delayThreshold 参数用于设置延迟消息的阈值(以毫秒为单位)。

  1. 使用 spring-kafka-delay 库:

首先,将 spring-kafka-delay 库添加到项目的依赖中。对于 Maven 项目,可以在 pom.xml 文件中添加以下依赖:

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka-support</artifactId>
    <version>2.7.0</version>
</dependency>

接下来,创建一个消费者配置类,并设置延迟消息的阈值:

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.listener.config.MethodKafkaListenerEndpointRegistrar;
import org.springframework.kafka.listener.config.KafkaListenerEndpointRegistrarBean;

import java.util.HashMap;
import java.util.Map;

public class DelayedMessageConsumerConfigExample {

    public static Map<String, Object> createDelayedMessageConsumerConfig(String bootstrapServers, String groupId, long delayThreshold) {
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);

        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(createConsumerFactory(props));

        KafkaListenerEndpointRegistrarBean<String, String> registrar = new KafkaListenerEndpointRegistrarBean<>(factory);
        registrar.setEndpointRegistry(new DefaultEndpointRegistry());

        return props;
    }

    private static ConsumerFactory<String, String> createConsumerFactory(Map<String, Object> props) {
        return new DefaultKafkaConsumerFactory<>(props);
    }
}

在这个例子中,delayThreshold 参数用于设置延迟消息的阈值(以毫秒为单位)。

请注意,这两个示例仅用于演示如何设置延迟消息的阈值。在实际应用中,您可能需要根据具体需求对这些示例进行调整。

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