zookeeper+kafka 集群和高可用

1、本机环境

    操作系统：ubuntu 12.04
    需安装：
     java的环境，安装过程可参考：
         http://blog.csdn.net/u014388408/article/details/50587438
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2、 Zookeeper集群搭建

（1）下载zookeeper安装

wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.3.6/zookeeper-3.3.6.tar.gz
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然后解压：

tar -xvf  zookeeper-3.3.6.tar.gz -C /opt/amqbroker（需要解压的路径）
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修改配置文件：

zoo_sample.cfg 修改文件名为 zoo.cfg
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修改zoo.cfg 配置文件内容为

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/opt/amqbroker/zookeeper/data
dataLogDir=/opt/amqbroker/zookeeper/log
clientPort=2181
server.one=192.168.0.100:2888:3888
server.two=192.168.0.101:2888:3888
server.three=192.168.0.102:2888:3888
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然后在/opt/amqbroker/zookeeper/data目录下创建myid文件，在文件中写入当前机器的id，例如配置中server.one=192.168.0.100:2888:3888，在myid文件写入字符 “one” 保存退出。
另外2台机器和这台机器的配置一样，myid 写各自服务器的id名。

3、Kafka 安装

下载地址： wget http://apache.fayea.com/kafka/0.9.0.1/kafka_2.11-0.9.0.1.tgz 

解压： tar -xvf kafka_2.11-0.9.0.1.tgz 
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进入kafka_2.11-0.9.0.1.tgz/config/目录下

vi server.properties 修改一下几处：
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broker.id=11               //注意，id名，各个服务器配置一个不相同的名字。
hostname.name=192.168.0.100
port=9092

advertised.host.name=192.168.0.100
advertised.port=9092

以及集群的配置
zookeeper.connect=192.168.0.100:2181,192.168.0.101:2181,192.168.0.102:2181
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然后在启动kafka，两外2台服务器也采用以上配置，分别启动kafka。

 bin/kafka-server-start.sh config/server.properties 
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接下来创建两个分区，两个副本的Topic。

bin/kafka-topics.sh --create --zookeeper 192.168.0.100:2181,192.168.0.101:2181,192.168.0.102:2181 --replication-factor 2 --partitions 2 --topic kafkatest
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查看Topic（test）的状态

bin/kafka-topics.sh --describe --zookeeper 10.0.0.100:2181,10.0.0.101:2181,10.0.0.102:2181 --topic test     
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输出结果：

Topic:test  PartitionCount:2    ReplicationFactor:2 Configs:
Topic: test Partition: 0    Leader: 158 Replicas: 0,158 Isr: 158
Topic: test Partition: 1    Leader: 111 Replicas: 111,0 Isr: 111
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Topoc（test）有两个分区 0，1

分区0：处于leader服务器的是broker的id为158
      Replicas（副本）为0,158两台服务器。
      Isr（in-sync replicas）: 副本列表，158           
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4、用JAVA程序来测试消息的生产和消费。

(1)util工具类

package com.kafka;
import java.util.Properties;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;

public class KafkaUtil {  
    private static KafkaProducer<String, String> kp;  
    private static KafkaConsumer<String, String> kc;  

    public static KafkaProducer<String, String> getProducer() {  
        if (kp == null) {  
            Properties props = new Properties();  
            props.put("bootstrap.servers", "192.168.0.100:9092,192.168.0.101:9092,192.168.0.102:9092");  
            props.put("acks", "1");  
            props.put("retries", 0);  
            props.put("batch.size", 16384);  
            props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");  
            props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");  
            kp = new KafkaProducer<String, String>(props);  
        }  
        return kp;  
    }  

    public static KafkaConsumer<String, String> getConsumer() {  
        if(kc == null) {  
            Properties props = new Properties();  
            props.put("bootstrap.servers", "192.168.0.100:9092,192.168.0.101:9092,192.168.0.102:9092");  
            props.put("group.id", "0");  
            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");  
            kc = new KafkaConsumer<String, String>(props);  
        }  
        return kc;  
    }  
}  
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（2）Producer类

package com.kafka;
import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;

public class KafkaTest {
    public static void main(String[] args) throws Exception{
    Producer<String, String> producer = KafkaUtil.getProducer();
        int i = 0;
        while(true) {
            ProducerRecord<String, String> record = new    ProducerRecord<String, String>("test", String.valueOf(i), "this is message"+i);
   producer.send(record, new Callback() {
   public void onCompletion(RecordMetadata metadata, Exception e) {
       if (e != null)
        e.printStackTrace();
        System.out.println("message send to partition " + metadata.partition() + ", offset: " + metadata.offset());
                }
            });
            i++;
            Thread.sleep(1000);
        }
    }
}
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（3）Consumer 类

package com.kafka;
import java.util.Arrays;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

public class KafkaTest1 {
     public static void main(String[] args) throws Exception{  
            KafkaConsumer<String, String> consumer = KafkaUtil.getConsumer();  
            consumer.subscribe(Arrays.asList("test"));  
while(true) {  
ConsumerRecords<String, String> records = consumer.poll(1000);  
       for(ConsumerRecord<String, String> record : records) {  
          System.out.println("fetched from partition " + record.partition() + ", offset: " + record.offset() + ", message: " + record.value());  
                }  
            }  
        }  
}
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运行 producer端 类，结果如下：

message send to partition 0, offset: 306
message send to partition 0, offset: 307
message send to partition 0, offset: 308
message send to partition 0, offset: 309
message send to partition 0, offset: 310
message send to partition 0, offset: 311
message send to partition 0, offset: 312
message send to partition 0, offset: 313
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然后运行 Consumer端 类，能看到打印的消息即可。

5、 Kafka集群高可用性测试
（1）查看当前副本及状态

bin/kafka-topics.sh --describe --zookeeper 10.0.0.100:2181,10.0.0.101:2181,10.0.0.102:2181 --topic test     
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输出结果

    Topic:test  PartitionCount:2    ReplicationFactor:2 Configs:
    Topic: test Partition: 0    Leader: 158 Replicas: 0,158 Isr: 158
    Topic: test Partition: 1    Leader: 111 Replicas: 111,0 Isr: 111
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然后停掉一个broker服务器，如158，在查看当前副本状态，Leader状态会变成其他borker服务器，会通过一种选举策略生成一个新的Leader。