kafka 发送消息send报错，无法连接

package kafka.demo;

import java.util.Properties;
import java.util.concurrent.TimeUnit;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.serialization.StringSerializer;


/**
 * kafka-client
 * <dependency>
 *         <artifactId>kafka_2.12</artifactId>
        <version>1.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>1.0.0</version>
    </dependency>
 * 
 * @author zxc Mar 30, 2017 2:44:05 PM
 */
public class KafkaProducerDemo {


    protected static Properties props        = new Properties();
    protected static String     kafka_server = "120.79.44.52:8080";
    protected static String     topic        = "test";

    static {
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafka_server);
        props.put(ProducerConfig.ACKS_CONFIG, "all");
        props.put(ProducerConfig.RETRIES_CONFIG, 0);
        props.put(ProducerConfig.BATCH_SIZE_CONFIG, 16384);
        props.put(ProducerConfig.LINGER_MS_CONFIG, 1);
        props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 33554432);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        // props.put(ProducerConfig.PARTITIONER_CLASS_CONFIG, CustomPartitioner.class);
    }

    public static void main(String[] args) throws Exception {
        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(props);
        for (int i = 0; i < 100; i++) {
            producer.send(new ProducerRecord<String, String>(topic, Integer.toString(i), Integer.toString(i)), //
                          new org.apache.kafka.clients.producer.Callback() {

                              @Override
                              public void onCompletion(RecordMetadata recordMetadata, Exception e) {
                                  if (e == null) {
                                      System.out.println("offset=" + recordMetadata.offset() + ",partition=" + recordMetadata.partition());
                                  } else {
                                      System.out.println("send error!" + e);
                                  }
                              }
                          });
        }
        TimeUnit.SECONDS.sleep(3);
        producer.close();
    }
}

但是执行的时直接报错了

Code here
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time
send error!org.apache.kafka.common.errors.TimeoutException: Expiring 100 record(s) for test-0: 30026 ms has passed since batch creation plus linger time

求指教问题呀，按照你https://www.orchome.com/342 这里提到的，修改ip，但是修改了也直接报错。

Code here
kafka.common.KafkaException: Socket server failed to bind to 120.79.44.52:8080: Cannot assign requested address.
    at kafka.network.Acceptor.openServerSocket(SocketServer.scala:331)
    at kafka.network.Acceptor.<init>(SocketServer.scala:256)
    at kafka.network.SocketServer.$anonfun$startup$1(SocketServer.scala:98)
    at kafka.network.SocketServer.$anonfun$startup$1$adapted(SocketServer.scala:89)
    at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:52)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
    at kafka.network.SocketServer.startup(SocketServer.scala:89)
    at kafka.server.KafkaServer.startup(KafkaServer.scala:229)
    at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:38)
    at kafka.Kafka$.main(Kafka.scala:92)
    at kafka.Kafka.main(Kafka.scala)
Caused by: java.net.BindException: Cannot assign requested address
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:433)
    at sun.nio.ch.Net.bind(Net.java:425)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
    at kafka.network.Acceptor.openServerSocket(SocketServer.scala:327)
    ... 11 more