时间戳

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java - spring-kafka 中的 seekToTimestamp

问题描述

我试图寻找时间戳功能，但由于某种原因，它对我不起作用。

在我的制片人中，我有下一个代码：

ProducerRecord<String, Obj> producer = new ProducerRecord<>("topic", 0, System.currentTimeMillis() - 10000, "key", obj);
kafkaTemplate.send(producer);

在我的 Kafka 监听器中，我试图从高于上述时间戳的某个时间戳中寻找偏移量：

@Component
@RequiredArgsConstructor
@KafkaListener(id = "container",
        topics = "topic",
        clientIdPrefix = "init_client",
        autoStartup = "true")
public class KafkaList implements ConsumerSeekAware {
   @Override
    public void onPartitionsAssigned(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {
                long timestamp = System.currentTimeMillis()+60*1000;
        log.info("Search for a time that is great or equal then {}", timestamp);
        callback.seekToTimestamp(new ArrayList<>(assignments.keySet()), timestamp);

    }

    @KafkaHandler
    public void listen(@Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key, Obj obj,
                       @Header(KafkaHeaders.RECEIVED_TIMESTAMP) Long timestamp) {
        log.info("Received message timestamp: {}, date: {}", timestamp,
                Instant.ofEpochMilli(timestamp).atZone(ZoneId.systemDefault()).toLocalDate());
    }
}

在日志中，我看到下一个输出：

Search for a time that is great or equal then 1613079865328
Received message timestamp: 1613079798676, date: 2021-02-11

Kafka 主题 1613079798676 中的时间戳值低于我的搜索值 1613079865328 那么为什么消费者会选择这个偏移量？

标签： javaapache-kafkaspring-kafka

解决方案

我刚刚用你的代码测试了它，它按我的预期工作；我在日志中看到了这个...

2021-02-16 11:30:16.587 INFO 36721 --- [o66163492-0-C-1] com.example.demo.So66163492Application：搜索大于或等于 1613493076587 的时间

2021-02-16 11:30:16.590 INFO 36721 --- [o66163492-0-C-1] Oakclients.consumer.KafkaConsumer：[Consumer clientId=consumer-so66163492-1，groupId=so66163492] 寻求为分区偏移 1所以66163492-0

2021-02-16 11:30:16.590 信息 36721 --- [o66163492-0-C-1] osklKafkaMessageListenerContainer：so66163492：分配的分区：[so66163492-0]

2021-02-16 11:30:16.611 INFO 36721 --- [o66163492-0-C-1] com.example.demo.So66163492Application：收到的消息时间戳：1613529016472 qux

@SpringBootApplication
public class So66163492Application extends AbstractConsumerSeekAware {

    private static final Logger log = LoggerFactory.getLogger(So66163492Application.class);

    public static void main(String[] args) {
        SpringApplication.run(So66163492Application.class, args);
    }

    @KafkaListener(id = "so66163492", topics = "so66163492")
    public void listen(@Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key, String obj,
            @Header(KafkaHeaders.RECEIVED_TIMESTAMP) Long timestamp) {

        log.info("Received message timestamp: {} {}", timestamp, obj);
    }

    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("so66163492").partitions(1).replicas(1).build();
    }

    @Bean
    public ApplicationRunner runner(KafkaTemplate<String, String> template) {
        return args -> {
            template.send(new ProducerRecord<>("so66163492", 0, System.currentTimeMillis() - 10_000, "foo", "bar"));
            template.send(new ProducerRecord<>("so66163492", 0, System.currentTimeMillis() + 36_000_000, "baz", "qux"));
        };
    }

    @Override
    public void onPartitionsAssigned(Map<TopicPartition, Long> assignments, ConsumerSeekCallback callback) {
        long timestamp = System.currentTimeMillis() + 60 * 1000;
        log.info("Search for a time that is great or equal then {}", timestamp);
        callback.seekToTimestamp(new ArrayList<>(assignments.keySet()), timestamp);
    }

}

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