kafka环境搭建

准备环境

CentOS release 6.6 (Final)

wget http://mirror.bit.edu.cn/apache/kafka/0.8.0/kafka_2.10-0.8.0.tgz[/code] 
tar -zxvf kafka_2.10-0.8.0.tgz


启动
启动
Zookeeper


bin/zookeeper-server-start.sh config/zookeeper.properties &


启动
kafka


bin/kafka-server-start.sh config/server.properties &


创建
topic


我修改了默认的端口

bin/kafka-topics.sh --create --zookeeper localhost:2182 --replication-factor 1 --partitions 1 --topic testweixuan &


查看创建的
topic


bin/kafka-topics.sh --list --zookeeper localhost:2182


查看topic的详细信息

bin/kafka-topics.sh --describe --zookeeper localhost:2182


测试
producer


运行producer并在控制台中输一些消息：

bin/kafka-console-producer.sh --broker-list 192.168.1.116:2182:9092 --topic testweixuan


测试
consumer


bin/kafka-console-consumer.sh --zookeeper 192.168.1.116:2182 --topic testweixuan --from-beginning


注意：需要开两个终端

搭建开发环境
生产者代码
package com.fengtang;

import java.util.Properties;

import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

/**
* Create by fengtang
* 2015/10/8 0008
* KafkaDemo_01
*/
public class KafkaProducer {
private final Producer<String, String> producer;
public final static String TOPIC = "TEST-TOPIC";
private KafkaProducer() {
Properties props = new Properties();
/**
* 此处配置的是kafka的端口
*/
props.put("metadata.broker.list", "192.168.1.116:9092");

/**
*  配置value的序列化类
*/
props.put("serializer.class", "kafka.serializer.StringEncoder");
/**
* 配置key的序列化类
*/
props.put("key.serializer.class", "kafka.serializer.StringEncoder");

props.put("request.required.acks", "-1");
producer = new Producer<>(new ProducerConfig(props));
}

void produce() {
int messageNo = 1000;
final int COUNT = 10000;
while (messageNo < COUNT) {
String key = String.valueOf(messageNo);
String data = "hello kafka message " + key;
producer.send(new KeyedMessage<>(TOPIC, key, data));
System.out.println(data);
messageNo++;
}
}

public static void main(String[] args) {
new KafkaProducer().produce();
}
}


消费者代码
package com.fengtang;

import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.serializer.StringDecoder;
import kafka.utils.VerifiableProperties;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
* Create by fengtang
* 2015/10/8 0008
* KafkaDemo_01
*/
public class KafkaConsumer {
private final ConsumerConnector consumer;
private KafkaConsumer() {
Properties props = new Properties();
/**
* zookeeper 配置
*/
props.put("zookeeper.connect", "192.168.1.116:2182");

/**
* group 代表一个消费组
*/
props.put("group.id", "jd-group");

/**
* zk连接超时
*/
props.put("zookeeper.session.timeout.ms", "400000");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");
props.put("auto.offset.reset", "smallest");
/**
* 序列化类
*/
props.put("serializer.class", "kafka.serializer.StringEncoder");
ConsumerConfig config = new ConsumerConfig(props);
consumer = kafka.consumer.Consumer.createJavaConsumerConnector(config);
}

void consume() {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(KafkaProducer.TOPIC, new Integer(1));
StringDecoder keyDecoder = new StringDecoder(new VerifiableProperties());
StringDecoder valueDecoder = new StringDecoder(new VerifiableProperties());
Map<String, List<KafkaStream<String, String>>> consumerMap =
consumer.createMessageStreams(topicCountMap, keyDecoder, valueDecoder);
KafkaStream<String, String> stream = consumerMap.get(KafkaProducer.TOPIC).get(0);
ConsumerIterator<String, String> it = stream.iterator();
while (it.hasNext())
System.out.println(it.next().message());
}

public static void main(String[] args) {
new KafkaConsumer().consume();
}
}


pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>

<groupId>com.fengtang</groupId>
<artifactId>kafkademo</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>kafkademo</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<artifactId>jmxtools</artifactId>
<groupId>com.sun.jdmk</groupId>
</exclusion>
<exclusion>
<artifactId>jmxri</artifactId>
<groupId>com.sun.jmx</groupId>
</exclusion>
<exclusion>
<artifactId>jms</artifactId>
<groupId>javax.jms</groupId>
</exclusion>
<exclusion>
<artifactId>mail</artifactId>
<groupId>javax.mail</groupId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
</project>


解决报错
kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries.


需要改动config文件夹下的server.properties中的以下两个属性

zookeeper.connect=localhost:2181改成zookeeper.connect=192.168.1.116 (自己的服务器IP地址):2182


以及默认注释掉的
#host.name=localhost改成host.name=192.168.1.116 (自己的服务器IP地址)


成功截图