springboot kafka group.id多消费组配置
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很早之前就使用了springboot + kafka组合配置,但是之前使用的spring-kafka(1.1.7)版本较低,所以只能通过 spring.kafka.consumer.group-id=default_consumer_group 或者 propsMap.put(ConsumerConfig.GROUP_ID_CONFIG, “default_consumer_group”);的形式配置一个默认消组,当然理论上这也是没有问题的,但是如果你定义的topic数量过多且并发消费比较大,只有一个消费组的配置方式就会暴露出很多问题,其中主要的一个问题便是每个topic分区的offset偏移量问题(在大并发下会出现offset异常问题),因为他们都保存在同一个消费组中。
直到后来发布了spring-kafka 1.3.x的版本后,增加了groupId的属性,非常方便的帮助我们解决了实现每个topic自定义一个消费组的问题,我们再也不用共用一个消费组了。
接下来通过代码演示看是否如我们的期望一样:
pom依赖
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.5.10.RELEASE</version>
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<relativePath/> <!– lookup parent from repository –>
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<!– https://mvnrepository.com/artifact/org.springframework.kafka/spring-kafka –>
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<dependency>
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<groupId>org.springframework.kafka</groupId>
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<artifactId>spring-kafka</artifactId>
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<version>1.3.5.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<!–引入elasticsearch–>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
application.properties
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server.port=10087
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spring.application.name=example
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#topic
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spring.kafka.bootstrap-servers=10.0.2.22:9092
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kafka.test.topic=TEST_TOPIC
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#es
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spring.data.elasticsearch.cluster-name=elasticsearch
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spring.data.elasticsearch.cluster-nodes=10.0.2.23:9300
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#spring.data.elasticsearch.cluster-nodes=10.0.2.22:9300
生产者:
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/**
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* @author xiaofeng
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* @version V1.0
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* @title: TestKafkaSender.java
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* @package: com.example.demo.kafka.sender
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* @description: kafka生产者
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* @date 2018/4/2 0002 下午 3:31
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*/
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public class TestKafkaSender {
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private KafkaTemplate kafkaTemplate;
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“${kafka.test.topic}”)(
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String testTopic;
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public void sendTest(String msg){
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kafkaTemplate.send(testTopic, msg);
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}
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}
消费者1:
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/**
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* @author xiaofeng
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* @version V1.0
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* @title: TestKafkaConsumer2.java
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* @package: com.example.demo.kafka.consumer
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* @description: kafka消费者
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* @date 2018/4/2 0002 下午 3:31
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*/
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public class TestKafkaConsumer {
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Logger logger = LoggerFactory.getLogger(getClass());
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/**
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* topics: 配置消费topic,以数组的形式可以配置多个
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* groupId: 配置消费组为”xiaofeng1“
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*
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* @param message
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*/
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“${kafka.test.topic}”},groupId = “xiaofeng1”)(topics = {
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public void consumer(String message) {
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logger.info(“groupId = xiaofeng1, message = “ + message);
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}
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}
消费者2:
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/**
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* @author xiaofeng
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* @version V1.0
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* @title: TestKafkaConsumer2.java
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* @package: com.example.demo.kafka.consumer
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* @description: kafka消费者
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* @date 2018/4/2 0002 下午 3:31
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*/
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public class TestKafkaConsumer2 {
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Logger logger = LoggerFactory.getLogger(getClass());
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/**
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* topics: 配置消费topic,以数组的形式可以配置多个
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* groupId: 配置消费组为”xiaofeng2“
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*
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* @param message
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*/
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“${kafka.test.topic}”}, groupId = “xiaofeng2”)(topics = {
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public void consumer(String message) {
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logger.info(“groupId = xiaofeng2, message = “ + message);
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}
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}
测试类:
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TestKafkaSender sender;
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public void send() {
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for (int i = 0; i < Integer.MAX_VALUE; i++) {
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logger.info(“send message = “ + i);
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sender.sendTest(i + “”);
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try {
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Thread.sleep(1000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
运行效果: