kafka指定消费，查不出数据

Properties props = new Properties();
        props.put("bootstrap.servers", bootstrapServers);
        props.put("group.id", groupId);
        props.put("enable.auto.commit", false);
        props.put("auto.commit.interval.ms", "1000");
        props.put("session.timeout.ms", "30000");
        props.put("max.poll.records", maxPollRecords);
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        //consumer.subscribe(Arrays.asList(topic));

        TopicPartition p = new TopicPartition(topic,2);
        consumer.assign(Arrays.asList(p));
        consumer.seek(p,488430);
        //while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            for (ConsumerRecord<String, String> record : records) {
                String V = record.value();
            }
       // }

查不出数据recods没有内容