kafka~消息的批量拉取
kafka支持一次拉取批量的消息,max.poll.records
这个配置用来设置一次拉取的消息数量,可以自己定义KafkaListenerContainerFactory
来开启消费者批量监听消息的功能.
KafkaBlukConfig配置
@Configuration
public class KafkaBlukConfig {
@Value("${spring.kafka.hosts}")
private String bootstrapServers;
@Value("${spring.kafka.consumer.max-poll-records:30}")
private Integer maxPollRecords;
@Value("${spring.kafka.consumer.groupId:group1}")
private String group;
/**
* 消费者配置信息
*/
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG, maxPollRecords);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
props.put(ConsumerConfig.GROUP_ID_CONFIG, group);
props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 120000);
props.put(ConsumerConfig.REQUEST_TIMEOUT_MS_CONFIG, 180000);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
return props;
}
/**
* 消费者批量⼯程
*/
@Bean
public KafkaListenerContainerFactory<?> batchFactory() {
ConcurrentKafkaListenerContainerFactory<Integer, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(new DefaultKafkaConsumerFactory<>(consumerConfigs()));
//设置为批量消费,每个批次数量在Kafka配置参数中设置ConsumerConfig.MAX_POLL_RECORDS_CONFIG
factory.setBatchListener(true);
return factory;
}
}
消费者指定factory
@KafkaListener(id = "consumer1", topics = "${nezha.listener.topicName}", containerFactory = "batchFactory")
public void listenYaosu(List<ConsumerRecord<String, String>> record) throws Exception {
doBulkEvent(record);
}
- 通过consumer1这个名称,可以控制消费者的启动和停止
@RestController
public class ApiController {
public static String listenerId = "Consumer1";
@Autowired
private KafkaListenerEndpointRegistry kafkaRegistry;
@GetMapping("kafka-restart")
public ResponseEntity start() {
kafkaRegistry.getListenerContainer(listenerId).start();
return ResponseEntity.ok("操作成功");
}
@GetMapping("kafka-stop")
public ResponseEntity stop() {
kafkaRegistry.getListenerContainer(listenerId).stop();
return ResponseEntity.ok("操作成功");
}
}