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

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