Kafka快速入门

文章目录

• ​​安装部署​​

• ​​集群规划​​
• ​​集群部署​​
• ​​kafka群起脚本​​

• ​​Kafka命令行操作​​

• ​​主题命令行操作​​
• ​​生产者命令行操​​
• ​​消费者命令行操作​​

安装部署

集群规划

集群部署

1. 官方下载地址：http://kafka.apache.org/downloads.html
2. 上传安装包到02的/opt/software目录下

[atguigu@hadoop02 software]$ ll
-rw-rw-r--. 1 atguigu atguigu  86486610 3月  10 12:33 kafka_2.12-3.0.0.tgz

3. 解压安装包到/opt/module/目录下

[atguigu@hadoop02 software]$ tar -zxvf kafka_2.12-3.0.0.tgz -C /opt/module/

4. 进入到/opt/module目录下，修改解压包名为kafka

[atguigu@hadoop02 module]$ mv kafka_2.12-3.0.0 kafka

5. 修改config目录下的配置文件server.properties内容如下

[atguigu@hadoop02 kafka]$ cd config/
[atguigu@hadoop02 config]$ vim server.properties
#broker的全局唯一编号，不能重复，只能是数字。
broker.id=02
#处理网络请求的线程数量
num.network.threads=3
#用来处理磁盘IO的线程数量
num.io.threads=8
#发送套接字的缓冲区大小
socket.send.buffer.bytes=102400
#接收套接字的缓冲区大小
socket.receive.buffer.bytes=102400
#请求套接字的缓冲区大小
socket.request.max.bytes=104857600
#kafka运行日志(数据)存放的路径，路径不需要提前创建，kafka自动帮你创建，可以配置多个磁盘路径，路径与路径之间可以用"，"分隔
log.dirs=/opt/module/kafka/datas
#topic在当前broker上的分区个数
num.partitions=1
#用来恢复和清理data下数据的线程数量
num.recovery.threads.per.data.dir=1
# 每个topic创建时的副本数，默认时1个副本
offsets.topic.replication.factor=1
#segment文件保留的最长时间，超时将被删除
log.retention.hours=168
#每个segment文件的大小，默认最大1G
log.segment.bytes=1073741824
# 检查过期数据的时间，默认5分钟检查一次是否数据过期
log.retention.check.interval.ms=300000
#配置连接Zookeeper集群地址（在zk根目录下创建/kafka，方便管理）
zookeeper.connect=hadoop02:2181,hadoop03:2181,hadoop04:2181/kafka

6. 配置环境变量

[atguigu@hadoop02 kafka]$ sudo vim /etc/profile.d/my_env.sh
#KAFKA_HOME
export KAFKA_HOME=/opt/module/kafka
export PATH=$PATH:$KAFKA_HOME/bin
[atguigu@hadoop02 kafka]$ source /etc/profile

7. 分发环境变量文件并source

[atguigu@hadoop02 kafka]$ xsync /etc/profile.d/my_env.sh
==================== hadoop02 ====================
sending incremental file list

sent 47 bytes  received 12 bytes  39.33 bytes/sec
total size is 371  speedup is 6.29
==================== hadoop03 ====================
sending incremental file list
my_env.sh
rsync: mkstemp "/etc/profile.d/.my_env.sh.Sd7MUA" failed: Permission denied (13)

sent 465 bytes  received 126 bytes  394.00 bytes/sec

total size is 371  speedup is 0.63
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1178) [sender=3.1.2]
==================== hadoop04 ====================
sending incremental file list
my_env.sh
rsync: mkstemp "/etc/profile.d/.my_env.sh.vb8jRj" failed: Permission denied (13)

sent 465 bytes  received 126 bytes  1,182.00 bytes/sec
total size is 371  speedup is 0.63
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1178) [sender=3.1.2]，
# 这时你觉得适用sudo就可以了，但是真的是这样吗？
[atguigu@hadoop02 kafka]$ sudo xsync /etc/profile.d/my_env.sh
sudo: xsync：找不到命令
# 这时需要将xsync的命令文件，copy到/usr/bin/下，sudo（root）才能找到xsync命令
[atguigu@hadoop02 kafka]$ sudo cp /home/atguigu/bin/xsync /usr/bin/
[atguigu@hadoop02 kafka]$ sudo xsync /etc/profile.d/my_env.sh
# 在每个节点上执行source命令,如何你没有xcall脚本，就手动在三台节点上执行source命令。
[atguigu@hadoop02 kafka]$ xcall source /etc/profile

8. 分发安装包

[atguigu@hadoop02 module]$ xsync kafka/

9. 修改配置文件中的brokerid
   分别在hadoop03和hadoop04上修改配置文件server.properties中broker.id=03、broker.id=04

[atguigu@hadoop03 kafka]$ vim config/server.properties
broker.id=03

[atguigu@hadoop04 kafka]$ vim config/server.properties
broker.id=04

10. 启动集群
    ① 先启动Zookeeper集群

[atguigu@hadoop02 kafka]$ zk.sh start

② 依次在hadoop02、hadoop03、hadoop04节点上启动kafka

[atguigu@hadoop02 kafka]$ bin/kafka-server-start.sh -daemon config/server.properties

[atguigu@hadoop03 kafka]$ bin/kafka-server-start.sh -daemon config/server.properties

[atguigu@hadoop04 kafka]$ bin/kafka-server-start.sh -daemon config/server.properties

11. 关闭集群

[atguigu@hadoop02 kafka]$ bin/kafka-server-stop.sh

[atguigu@hadoop03 kafka]$ bin/kafka-server-stop.sh

[atguigu@hadoop04 kafka]$ bin/kafka-server-stop.sh

kafka群起脚本

1. 脚本编写
   在/home/atguigu/bin目录下创建文件kafka.sh脚本文件:

#! /bin/bash
if (($#==0)); then
  echo -e "请输入参数：\n start  启动kafka集群;\n stop  停止kafka集群;\n" && exit
fi

case $1 in
  "start")
    for host in hadoop03 hadoop02 hadoop04
      do
        echo "---------- $1 $host 的kafka ----------"
        ssh $host "/opt/module/kafka/bin/kafka-server-start.sh -daemon /opt/module/kafka/config/server.properties"
      done
      ;;
  "stop")
    for host in hadoop03 hadoop02 hadoop04
      do
        echo "---------- $1 $host 的kafka ----------"
        ssh $host "/opt/module/kafka/bin/kafka-server-stop.sh"
      done
      ;;
    *)
        echo -e "---------- 请输入正确的参数 ----------\n"
        echo -e "start  启动kafka集群;\n stop  停止kafka集群;\n" && exit
      ;;
esac

2. 脚本文件添加权限

[atguigu@hadoop02 bin]$ chmod +x kafka.sh

Kafka命令行操作

主题命令行操作

1. 查看操作主题命令需要的参数

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh

2. 重要的参数如下
3. 查看当前服务器中的所有topic

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop102:9092 --list

4. 创建一个主题名为first的topic

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop02:9092 --create --replication-factor 3 --partitions 3 --topic first

5. 查看Topic的详情

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop02:9092 --describe --topic first
Topic: first    TopicId: EVV4qHcSR_q0O8YyD32gFg PartitionCount: 1       ReplicationFactor: 3    Configs: segment.bytes=1073741824
        Topic: first    Partition: 0    Leader: 02     Replicas: 02,03,04   Isr: 02,03,04

6. 修改分区数（注意：分区数只能增加，不能减少）

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop02:9092 --alter --topic first --partitions 3

7. 再次查看Topic的详情

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop02:9092 --describe --topic first
Topic: first    TopicId: EVV4qHcSR_q0O8YyD32gFg PartitionCount: 3       ReplicationFactor: 3    Configs: segment.bytes=1073741824
        Topic: first    Partition: 0    Leader: 02     Replicas: 02,03,04   Isr: 02,03,04
        Topic: first    Partition: 1    Leader: 03     Replicas: 03,04,02   Isr: 03,04,02
        Topic: first    Partition: 2    Leader: 04     Replicas: 04,02,03   Isr: 04,02,03

8. 删除topic

[atguigu@hadoop02 kafka]$ bin/kafka-topics.sh --bootstrap-server hadoop02:9092 --delete --topic first

生产者命令行操

1. 查看命令行生产者的参数

[atguigu@hadoop02 kafka]$ bin/kafka-console-producer.sh

3. 重要的参数如下：



4. 生产消息

[atguigu@hadoop02 kafka]$ bin/kafka-console-producer.sh --broker-list hadoop02:9092 --topic first
>hello world
>atguigu  atguigu

消费者命令行操作

1. 查看命令行消费者的参数

[atguigu@hadoop02 kafka]$ bin/kafka-console-consumer.sh

3. 重要的参数如下：



4. 消费消息

[atguigu@hadoop02 kafka]$ bin/kafka-console-consumer.sh --bootstrap-server hadoop02:9092 --topic first

4. 从头开始消费

[atguigu@hadoop02 kafka]$ bin/kafka-console-consumer.sh --bootstrap-server hadoop02:9092 --from-beginning --topic first