为什么kafka消费消息不完整？

我在代码里produce，在Shell里consumer，为什么consumer不完整？只到767，不到999？

代码如下：

package com.lzm.demo.demo_kafka;

import java.util.Arrays;
import java.util.Properties;

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

/**
 * 
 * @author       
 * @date 2016  1  11       4:18:56
 */

public class kafkaConsumer extends Thread {

	private String[] topics;

	public kafkaConsumer(String[] topics) {
		super();
		this.topics = topics;
	}

	@Override
	public void run() {

		Consumer consumer = createConsumer();

		while (true) {
			ConsumerRecords<String, String> records = consumer.poll(100);
			for (ConsumerRecord<String, String> record : records) {
				System.out.printf("key = %s, value = %s, offset = %d\n", record.key(), record.value(), record.offset());
			}
		}
	}

	private Consumer createConsumer() {
		Properties props = new Properties();
		props.put("bootstrap.servers", "192.168.14.237:9091,192.168.14.237:9092,192.168.14.237:9093");
		props.put("group.id", "d");
		props.put("enable.auto.commit", "true");
		props.put("auto.commit.interval.ms", "1000");
		props.put("session.timeout.ms", "30000");
		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("test", "foo"));
		return consumer;
	}

	public static void main(String[] args) {
		new kafkaConsumer(new String[] { "testt", "bar" }).start();
	}

}

就是拿不到消息