zookeeper与kafka安装部署及java环境搭建(发布订阅模式)

1. ZooKeeper安装部署

本文在一台机器上模拟3个zk server的集群安装。

1.1. 创建目录、解压

cd /usr/

#创建项目目录

mkdir zookeeper

cd zookeeper

mkdir tmp

mkdir zookeeper-1

mkdir zookeeper-2

mkdir zookeeper-3

cd tmp

mkdir zk1

mkdir zk2

mkdir zk3

cd zk1

mkdir data

mkdir log

cd zk2

mkdir data

mkdir log

cd zk3

mkdir data

mkdir log

#将压缩包分别解压一份到 zookeeper-1, zookeeper-2, zookeeper-3目录下

tar -zxvf zookeeper-3.4.10.tgz

1.2. 创建每个目录下conf/zoo.cfg配置文件 

/usr/zookeeper/zookeeper-1/zookeeper-3.4.10/conf/zoo.cfg 内容如下：

tickTime=2000

initLimit=10

syncLimit=5

dataDir=/home/hadoop/tmp/zk1/data

dataLogDir=/home/hadoop/tmp/zk1/log

clientPort=2181

server.1=192.168.68.128:2287:3387

server.2=192.168.68.128:2288:3388

server.3=192.168.68.128:2289:3389

/usr/zookeeper/zookeeper-1/zookeeper-3.4.10/conf/zoo.cfg 内容如下：

tickTime=2000

initLimit=10

syncLimit=5

dataDir=/home/hadoop/tmp/zk2/data

dataLogDir=/home/hadoop/tmp/zk2/log

clientPort=2182

server.1=192.168.68.128:2287:3387

server.2=192.168.68.128:2288:3388

server.3=192.168.68.128:2289:3389

/usr/zookeeper/zookeeper-1/zookeeper-3.4.10/conf/zoo.cfg 内容如下：

tickTime=2000

initLimit=10

syncLimit=5

dataDir=/home/hadoop/tmp/zk3/data

dataLogDir=/home/hadoop/tmp/zk3/log

clientPort=2183

server.1=192.168.68.128:2287:3387

server.2=192.168.68.128:2288:3388

server.3=192.168.68.128:2289:3389

注：红色部分192.168.68.128为服务器的ip。

因为是在一台机器上模拟集群，所以端口不能重复，这里用2181~2183，2287~2289，以及3387~3389相互错开。

另外每个zk的instance，都需要设置独立的数据存储目录、日志存储目录，所以dataDir、dataLogDir这二个节点对应的目录，需要手动先创建好。即1.1所述的：

/usr/zookeeper/tmp/zk1/data

/usr/zookeeper/tmp/zk1/log

/usr/zookeeper/tmp/zk2/data

/usr/zookeeper/tmp/zk2/log

/usr/zookeeper/tmp/zk3/data

/usr/zookeeper/tmp/zk3/log

1.3. 创建每个目录下data/myid文件

另外还有一个非常关键的设置，在每个zk server配置文件的dataDir所对应的目录下，必须创建一个名为myid的文件，其中的内容必须与zoo.cfg中server.x中的x相同，即：

/usr/zookeeper/tmp/zk1/data/myid 中的内容为1，对应server.1中的1

/usr/zookeeper/tmp/zk1/data/myid 中的内容为2，对应server.2中的2

/usr/zookeeper/tmp/zk1/data/myid 中的内容为3，对应server.3中的3

生产环境中，分布式集群部署的步骤与上面基本相同，只不过因为各zk server分布在不同的机器，上述配置文件中的localhost换成各服务器的真实Ip即可。分布在不同的机器后，不存在端口冲突问题，可以让每个服务器的zk均采用相同的端口，这样管理起来比较方便。

1.4. 启动验证 

/usr/zookeeper/zookeeper-1/bin/zkServer.sh start &

/usr/zookeeper/zookeeper-3/bin/zkServer.sh start &

/usr/zookeeper/zookeeper-3/bin/zkServer.sh start &

注：&符号表示后台启动，启动后可以退出命令行窗口。

启用成功后，输入 jps 看下进程：

2644 QuorumPeerMain

2677 QuorumPeerMain

2724 QuorumPeerMain

应该至少能看到以上几个进程。

查看zk状态命令：

bin/zkServer.sh status

分别查看zk状态，可以看到：

ZooKeeper JMX enabled by default

Using config: /usr/zookeeper/zookeeper-1/zookeeper-3.4.10/bin/../conf/zoo.cfg

Mode: follower

ZooKeeper JMX enabled by default

Using config: /usr/zookeeper/zookeeper-2/zookeeper-3.4.10/bin/../conf/zoo.cfg

Mode: leader

ZooKeeper JMX enabled by default

Using config: /usr/zookeeper/zookeeper-3/zookeeper-3.4.10/bin/../conf/zoo.cfg

Mode: follower

至此，zookeeper集群已经部署完成了。

2. Kafka安装部署

2.1. 创建目录、解压

cd /usr/

#创建项目目录

mkdir kafka

cd kafka

mkdir tmp

cd tmp

#创建kafka消息目录，主要存放kafka消息

mkdir  kafka-logs-1

mkdir  kafka-logs-2

mkdir  kafka-logs-3

#将压缩包放到usr/kafka内，解压

tar -zxvf kafka_2.10-0.10.1.0.tgz

2.2. 修改配置文件

进入到config目录

cd /usr/kafka/kafka_2.10-0.10.1.0/config

主要关注：server.properties 这个文件即可。将其拷贝三份到同级目录：

config/server-1.properties

config/server-3.properties

config/server-2.properties

以下为默认配置：

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# see kafka.server.KafkaConfig for additional details and defaults

############################# Server Basics #############################

# The id of the broker. This must be set to a unique integer for each broker.

broker.id=0

# Switch to enable topic deletion or not, default value is false

#delete.topic.enable=true

############################# Socket Server Settings #############################

# The address the socket server listens on. It will get the value returned from

# java.net.InetAddress.getCanonicalHostName() if not configured.

#   FORMAT:

#     listeners = security_protocol://host_name:port

#   EXAMPLE:

#     listeners = PLAINTEXT://your.host.name:9092

#listeners=PLAINTEXT://:9092

# Hostname and port the broker will advertise to producers and consumers. If not set,

# it uses the value for "listeners" if configured.  Otherwise, it will use the value

# returned from java.net.InetAddress.getCanonicalHostName().

#advertised.listeners=PLAINTEXT://your.host.name:9092

# The number of threads handling network requests

num.network.threads=3

# The number of threads doing disk I/O

num.io.threads=8

# The send buffer (SO_SNDBUF) used by the socket server

socket.send.buffer.bytes=102400

# The receive buffer (SO_RCVBUF) used by the socket server

socket.receive.buffer.bytes=102400

# The maximum size of a request that the socket server will accept (protection against OOM)

socket.request.max.bytes=104857600

############################# Log Basics #############################

# A comma seperated list of directories under which to store log files

log.dirs=/tmp/kafka-logs

# The default number of log partitions per topic. More partitions allow greater

# parallelism for consumption, but this will also result in more files across

# the brokers.

num.partitions=1

# The number of threads per data directory to be used for log recovery at startup and flushing at shutdown.

# This value is recommended to be increased for installations with data dirs located in RAID array.

num.recovery.threads.per.data.dir=1

############################# Log Flush Policy #############################

# Messages are immediately written to the filesystem but by default we only fsync() to sync

# the OS cache lazily. The following configurations control the flush of data to disk.

# There are a few important trade-offs here:

#    1. Durability: Unflushed data may be lost if you are not using replication.

#    2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.

#    3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to exceessive seeks.

# The settings below allow one to configure the flush policy to flush data after a period of time or

# every N messages (or both). This can be done globally and overridden on a per-topic basis.

# The number of messages to accept before forcing a flush of data to disk

#log.flush.interval.messages=10000

# The maximum amount of time a message can sit in a log before we force a flush

#log.flush.interval.ms=1000

############################# Log Retention Policy #############################

# The following configurations control the disposal of log segments. The policy can

# be set to delete segments after a period of time, or after a given size has accumulated.

# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens

# from the end of the log.

# The minimum age of a log file to be eligible for deletion

log.retention.hours=168

# A size-based retention policy for logs. Segments are pruned from the log as long as the remaining

# segments don't drop below log.retention.bytes.

#log.retention.bytes=1073741824

# The maximum size of a log segment file. When this size is reached a new log segment will be created.

log.segment.bytes=1073741824

# The interval at which log segments are checked to see if they can be deleted according

# to the retention policies

log.retention.check.interval.ms=300000

############################# Zookeeper #############################

# Zookeeper connection string (see zookeeper docs for details).

# This is a comma separated host:port pairs, each corresponding to a zk

# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".

# You can also append an optional chroot string to the urls to specify the

# root directory for all kafka znodes.

zookeeper.connect=localhost:2181

# Timeout in ms for connecting to zookeeper

zookeeper.connection.timeout.ms=6000

需要修改的只有四处：

broker.id=0

#listeners=PLAINTEXT://:9092

log.dirs=/tmp/kafka-logs

zookeeper.connect=localhost:2181

分别修改三个配置文件，修改上面四处为：

config/server-1.properties

broker.id=1

listeners=PLAINTEXT://192.168.68.128:9092

log.dirs=/usr/kafka/tmp/kafka-logs-1

zookeeper.connect=192.168.68.128:2181,192.168.68.128:2182,192.168.68.128:2183

config/server-2.properties

broker.id=2

listeners=PLAINTEXT://192.168.68.128:9092

log.dirs=/usr/kafka/tmp/kafka-logs-2

zookeeper.connect=192.168.68.128:2181,192.168.68.128:2182,192.168.68.128:2183

config/server-3.properties

broker.id=3

listeners=PLAINTEXT://192.168.68.128:9092

log.dirs=/usr/kafka/tmp/kafka-logs-3

zookeeper.connect=192.168.68.128:2181,192.168.68.128:2182,192.168.68.128:2183

注：红色部分为服务器的ip。

2.3. 启动验证

进入kafka目录，后台启动kafka集群：

bin/kafka-server-start.sh ./config/server-1.properties &

bin/kafka-server-start.sh ./config/server-2.properties &

bin/kafka-server-start.sh ./config/server-3.properties &

执行命令jps验证是否启动：

2820 QuorumPeerMain

9366 Kafka

9655 Kafka

9924 Kafka

2877 QuorumPeerMain

2923 QuorumPeerMain

10189 Jps

至此，kafka集群已经部署完成了。

3. Kafka的java开发环境搭建

3.1. 导入jar包

解压kafka压缩包，进入kafka_2.10-0.10.1.0\libs，拷贝一下jar包到java工程的lib目录下：

3.2. Producer

package com.pers.producer;

import java.util.Properties;

import java.util.concurrent.TimeUnit;

import kafka.javaapi.producer.Producer;

import kafka.producer.KeyedMessage;

import kafka.producer.ProducerConfig;

import kafka.serializer.StringEncoder;

/**

* @author liangyadong

* @date 2017年5月26日 下午3:04:07

* @version 1.0

*/

public class KafkaProducer {

private String topic;

public KafkaProducer(String topic){

super();

this.topic = topic;

}

public void run(){

Producer producer = createProducer();

int i = 0;

while(true){

producer.send(new KeyedMessage<Integer, String>(topic, "message:" + i++));

try{

TimeUnit.SECONDS.sleep(1);

} catch(InterruptedException e) {

e.printStackTrace();

}

}

}

private Producer createProducer(){

Properties properties = new Properties();

properties.put("zookeeper.connect", "192.168.68.128:2181,192.168.68.128:2182,192.168.68.128:2183");// 声明zookeeper

properties.put("serializer.class", StringEncoder.class.getName());

properties.put("metadata.broker.list", "192.168.68.128:9092,192.168.68.128:9093,192.168.68.128:9094");// 声明kafka

return new Producer<Integer,String>(new ProducerConfig(properties));

}

public static void main(String[] args) {

new KafkaProducer("test111").run();// 创建主题,发送消息

}

}

3.3. Consumer

package com.pers.consumer;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import kafka.consumer.Consumer;

import kafka.consumer.ConsumerConfig;

import kafka.consumer.ConsumerIterator;

import kafka.consumer.KafkaStream;

import kafka.javaapi.consumer.ConsumerConnector;

/**

* @author liangyadong

* @date 2017年5月26日 下午4:01:37

* @version 1.0

*/

public class KafkaConsumer extends Thread{

private String topic;

public KafkaConsumer(String topic){

super();

this.topic = topic;

}

public void run() {

ConsumerConnector consumer = createConsumer();

Map<String, Integer> topicCountMap = new HashMap<String, Integer>();

topicCountMap.put(topic, 1); // 一次从主题中获取一个数据

Map<String, List<KafkaStream<byte[], byte[]>>>  messageStreams = consumer.createMessageStreams(topicCountMap);

KafkaStream<byte[], byte[]> stream = messageStreams.get(topic).get(0);// 获取每次接收到的这个数据

ConsumerIterator<byte[], byte[]> iterator =  stream.iterator();

while(iterator.hasNext()){

String message = new String(iterator.next().message());

System.out.println("接收到: " + message);

}

}

private ConsumerConnector createConsumer(){

Properties properties = new Properties();

properties.put("zookeeper.connect", "192.168.68.128:2181,192.168.68.128:2182,192.168.68.128:2183");// 声明zookeeper

properties.put("group.id", "group5");// 必须要使用别的组名称， 如果生产者和消费者都在同一组，则不能访问同一组内的topic数据

return Consumer.createJavaConsumerConnector(new ConsumerConfig(properties));

}

public static void main(String[] args) {

new KafkaConsumer("test111").run();// 使用kafka集群中创建好的主题 test

}

}

3.4. 启动验证

1、启动生产者

运行KafkaProducer.java中的main方法。

2、启动消费者

运行KafkaConsumer.java中的main方法。

控制台输出内容如下：

接收到: message:1

接收到: message:2

接收到: message:3

接收到: message:4

接收到: message:5

接收到: message:6

...

至此，搭建完成。

4. 常用命令

4.1. Zookeeper

4.1.1. 启动服务

bin/kafka-server-start.sh ./config/server-1.properties &

4.1.2. 关闭服务

zkServer.sh stop

4.2. Kafka

4.2.1. 启动服务（先启动zookeeper）

bin/kafka-server-start.sh ./config/server-1.properties &

4.2.2. 关闭服务（先关闭zookeeper，再关闭kafka）

kafka-server-stop.sh

4.2.3. 查看当前主题列表

./kafka-topics.sh --zookeeper 192.168.68.128:2181 --list

4.2.4. 创建主题（注意partitions分区数目）

kafka-topics.sh --zookeeper 192.168.68.128:2181 --create --topic XXX --partitions 2 --replication-factor 1

4.2.5. 删除主题

kafka-topics.sh --zookeeper 192.168.68.128:2181 --delete --topic XXX

4.2.6. 创建生产者

kakfa-console-producer.sh --broker-list 192.168.68.128:9092 --topic XXX

4.2.7. 创建消费者

kafka-console-consumer.sh --zookeeper 192.168.68.128:2181 --topic XXX  [--from-beginning 添加改选项则重置offset从头开始接收，若不配置，从启动时开始接收]