Kafka入门教程(二)
转自:https://blog.csdn.net/yuan_xw/article/details/79188061
Kafka集群环境安装
相关下载
JDK要求1.8版本以上。
JDK安装教程:http://blog.csdn.net/yuan_xw/article/details/49948285
Zookeeper安装教程:http://blog.csdn.net/yuan_xw/article/details/47148401
Kafka下载地址:http://mirrors.shu.edu.cn/apache/kafka/1.0.0/kafka_2.11-1.0.0.tgz
Kafka集群规划
主机名 | IP | 安装软件 |
---|---|---|
Kafka1 | 192.168.1.221 | Jdk、Zookeeper、Kafka |
Kafka2 | 192.168.1.222 | Jdk、Zookeeper、Kafka |
Kafka3 | 192.168.1.223 | Jdk、Zookeeper、Kafka |
配置ssh免密码登录:
产生密钥,执行命令:ssh-keygen -t rsa,按4回车,密钥文件位于\~/.ssh文件
在192.168.1.221上生产一对钥匙,将公钥拷贝到其他节点,包括自己,执行命令:
ssh-copy-id 192.168.1.221
ssh-copy-id 192.168.1.222
ssh-copy-id 192.168.1.223
在192.168.1.222上生产一对钥匙,将公钥拷贝到其他节点,包括自己,执行命令:
ssh-copy-id 192.168.1.221
ssh-copy-id 192.168.1.222
ssh-copy-id 192.168.1.223
在192.168.1.223上生产一对钥匙,将公钥拷贝到其他节点,包括自己,执行命令:
ssh-copy-id 192.168.1.221
ssh-copy-id 192.168.1.222
ssh-copy-id 192.168.1.223
在所有的服务器上设置环境变量:
export JAVA_HOME=/usr/local/software/jdk1.8.0_66 export CLASSPATH=.:$JAVA_HOME</span>/lib/dt.<span class="hljs-symbol">jar:</span><span class="hljs-variable">$JAVA_HOME/lib/tools.jar export KAFKA_HOME=/usr/local/software/kafka_2.11-1.0.0 export ZOOKEEPER_HOME=/usr/local/software/zookeeper-3.4.11 export PATH=.:$JAVA_HOME</span>/<span class="hljs-symbol">bin:</span><span class="hljs-variable">$KAFKA_HOME/bin:$ZOOKEEPER_HOME</span>/<span class="hljs-symbol">bin:</span><span class="hljs-variable">$PATH
刷新环境变量:source /etc/profile
关闭所有服务器上的防火墙:
systemctl stop firewalld.service
systemctl disable firewalld.service
安装Kafka
1.分别在[Kafka1、Kafka2、Kafka3]服务器下载:
tar -zxvf kafka_2.11-1.0.0.tgz
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2. 修改配置文件:Kafka1服务器配置文件
broker.id=0
listeners=PLAINTEXT://:9092
log.dir= /usr/local/software/kafka_2.11-1.0.0/kafka-logs
Kafka2服务器配置文件
broker.id=1
listeners=PLAINTEXT://:9092
log.dir= /usr/local/software/kafka_2.11-1.0.0/kafka-logs
Kafka3服务器配置文件
broker.id=2
listeners=PLAINTEXT://:9092
log.dir= /usr/local/software/kafka_2.11-1.0.0/kafka-logs
- 分别启动[Kafka1、Kafka2、Kafka3]服务器的kafka服务
启动命令:./bin/kafka-server-start.sh -daemon config/server.properties
查看启动日志:tail -100f logs/server.log
查看启动端口:lsof -i:9092
创建主题Topic
创建主题topic
执行命令:bin/kafka-topics.sh - -create - -zookeeper 192.168.1.221:2181
- -replication-factor 2 - -partitions 2 - -topic test
查看主题topic描述
执行命令:bin/kafka-topics.sh –list –zookeeper 192.168.1.223:2181
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查看创建的所有主题执行命令:bin/kafka-topics.sh –list –zookeeper 192.168.1.223:2181
生产者生产消息
执行命令:bin/kafka-console-producer.sh –broker-list 192.168.1.221:9092 –topic test
消费者消费消息
执行命令:bin/kafka-console-consumer.sh –bootstrap-server 192.168.1.223:9092 –topic test –from-beginning
JAVA客户端
新建一个maven项目,项目名称:kafka-demo:
代码结构如下:
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Maven的pom.xml文件:
<projectxmlns="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.kafka</groupId> <artifactId>kafka-demo</artifactId> <version>1.0-SNAPSHOT</version> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> <packaging>jar</packaging> <name>kafka-demo</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients --> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>1.0.0</version> </dependency> </dependencies> </project>
- 生产者代码实现:
package com.kafka; import org.apache.kafka.clients.producer.KafkaProducer; import org.apache.kafka.clients.producer.Producer; import org.apache.kafka.clients.producer.ProducerRecord; import java.util.Properties; /** * 生产者代码 */ public classDemoProducer{ public static void main( String[] args ){ Properties props = new Properties(); props.put("bootstrap.servers", "192.168.1.221:9092,192.168.1.222:9092,192.168.1.223:9092"); props.put("acks", "all"); props.put("retries", 0); props.put("batch.size", 16384); props.put("linger.ms", 1); props.put("buffer.memory", 33554432); props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer"); props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer"); Producer<String, String> producer = new KafkaProducer<>(props); for(int i = 0; i < 10; i++) { producer.send(new ProducerRecord<>("test", Integer.toString(i), "message_value=====>" + i)); } producer.close(); } }
- 消费者代码实现:
package com.kafka; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.apache.kafka.clients.consumer.ConsumerRecords; import org.apache.kafka.clients.consumer.KafkaConsumer; import java.util.Arrays; import java.util.Properties; /** * 消费者代码 */ public classDemoConsumer { public static void main(String[] args) { Properties props = new Properties(); props.put("bootstrap.servers", "192.168.1.221:9092,192.168.1.222:9092,192.168.1.223:9092"); props.put("group.id", "test"); 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")); while(true) { ConsumerRecords<String, String> records = consumer.poll(100); for(ConsumerRecord<String, String> record : records) { System.out.printf("offset = %d, key = %s, value = %s\n", record.offset(), record.key(), record.value()); } } } }
消息结果:
message_value=====>1
message_value=====>5
message_value=====>7
message_value=====>8
message_value=====>4
message_value=====>6
message_value=====>0
message_value=====>2
message_value=====>3
message_value=====>9
源代码下载地址:http://download.csdn.net/download/yuan_xw/10228246
学习Kafka推荐书籍:
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《Kafka入门与实践》
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《Kafka技术内幕 图文详解Kafka源码设计与实现》
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《流式架构:Kafka与MapR Streams数据流处理》
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《Scala语言基础与开发实战》
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《Kafka权威指南》
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《Kafka源码解析与实战》
–以上为《Kafka集群环境安装》,如有不当之处请指出,我后续逐步完善更正,大家共同提高。谢谢大家对我的关注。——厚积薄发(yuanxw)