kafka 從指定位置消費 seek

SeekDemo.java

public class SeekDemo extends ConsumerClientConfig {
    public static void main(String[] args) {
        Properties properties = initConfig();
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);
        consumer.subscribe(Arrays.asList(topic));
        // timeout 設定多少合适？ 太短會使分區配置設定失敗，太長有可能造成一别不必要的等待
        consumer.poll(Duration.ofMillis(2000));
        // 擷取消費者所配置設定到的分區
        Set<TopicPartition> assignment = consumer.assignment();
        System.out.println(assignment);
        for (TopicPartition tp : assignment) {
            // 參數1： 表示分區。參數2： 表示制定從分區的哪個位置開始消費
            consumer.seek(tp, 10);
        }
        while(true){
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> record: records){
                System.out.println(record.offset() + ":" + record.value());
            }
        }
    }
}