kafka and message queue

https://downloads.apache.org/kafka/3.5.1/kafka_2.13-3.5.1.tgz
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kafka dependencies and zookeeper

kakka configuration file

broker.id=1    #每个 broker 在集群中的唯一标识，正整数。每个节点不一样
listeners=PLAINTEXT://192.168.74.70:9092 ##监听地址
num.network.threads=3  # 定义用于网络处理的线程数。
num.io.threads=8  #定义用于I/O操作的线程数。
socket.send.buffer.bytes=102400  #设置用于发送数据的套接字缓冲区大小。
socket.receive.buffer.bytes=102400  # 设置用于接收数据的套接字缓冲区大小。
socket.request.max.bytes=104857600 #指定单个请求的最大字节数。
log.dirs=/data/kafka #kakfa 用于保存数据的目录，所有的消息都会存储在该目录当中
num.partitions=3#设置创建新的 topic 默认分区数量，一般为集群的节点数
num.recovery.threads.per.data.dir=1  #
offsets.topic.replication.factor=1  #设置偏移量主题的复制因子为1。
transaction.state.log.replication.factor=1 #事务主题的复制因子（设置更高以确保可用性）。 内部主题创建将失败，直到群集大小满足此复制因素要求
transaction.state.log.min.isr=1#覆盖事务主题的min.insync.replicas配置
log.retention.hours=168#设置 kafka 中消息保留时间，
log.retention.check.interval.ms=300000
zookeeper.connect=192.168.74.70:2181,192.168.74.71:2181,192.168.74.72:2181 #设置Zookeeper服务器的连接地址。
zookeeper.connection.timeout.ms=18000  #设置与Zookeeper建立连接的超时时间。
group.initial.rebalance.delay.ms=0 #设置初始重新平衡延迟的毫秒数。

Start
/apps/kafka_2.13-3.5.1/bin/kafka-server-start.sh -daemon /apps/kafka_2.13-3.5.1/config/server.properties

Check the port
netstat -antp|grep 2181

Create topic

/apps/kafka_2.13-3.5.1/bin/kafka-topics.sh --create --topic magedu --bootstrap-server 192.168.74.70:9092 --partitions 3 --replication-factor 2

查看topic
root@ubuntu20:~# /apps/kafka_2.13-3.5.1/bin/kafka-topics.sh --bootstrap-server 192.168.74.70:9092 --list
magedu

Stop kafka
/apps/kafka_2.13-3.5.1/bin/kafka-server-stop.sh

Verify topic
status description: There are three partitions, namely 0, 1, and
2. PartitionCount: 3 represents 3 shards.
ReplicationFactor: 2 represents 2 replicas.
The leader of partition 0 is 1.

Replicas: represents the brokerid stored in the replica
Isr: 1,3 represents the live person is 1,3

root@ubuntu20:~# /apps/kafka_2.13-3.5.1/bin/kafka-topics.sh  --describe   --bootstrap-server  192.168.74.70:9092
    Topic: magedu	TopicId: H4nV6WulTU-y_S4J2pHfOA	PartitionCount: 3	ReplicationFactor: 2	Configs: 
	Topic: magedu	Partition: 0	Leader: 1	Replicas: 1,3	Isr: 1,3
	Topic: magedu	Partition: 1	Leader: 1	Replicas: 2,1	Isr: 1
	Topic: magedu	Partition: 2	Leader: 3	Replicas: 3,2	Isr: 3

There is no 2 in the above Isr. You can know that node 2 is missing. Check and find that kafka of node 2 has not been started. It
is normal after starting.

Topic: magedu	TopicId: H4nV6WulTU-y_S4J2pHfOA	PartitionCount: 3	ReplicationFactor: 2	Configs: 
	Topic: magedu	Partition: 0	Leader: 1	Replicas: 1,3	Isr: 1,3
	Topic: magedu	Partition: 1	Leader: 1	Replicas: 2,1	Isr: 1,2
	Topic: magedu	Partition: 2	Leader: 3	Replicas: 3,2	Isr: 3,2

Specify the topic to view
/apps/kafka_2.13-3.5.1/bin/kafka-topics.sh --describe --bootstrap-server 192.168.74.70:9092 --topic luo

root@ubuntu20:~#ll /data/kafka/

Production data
/apps/kafka_2.13-3.5.1/bin/kafka-console-producer.sh --broker-list 192.168.74.71:9092,192.168.74.70:9092 --topic magedu

Consumption data
/apps/kafka_2.13-3.5.1/bin/kafka-console-consumer.sh --topic magedu --bootstrap-server 192.168.74.71:9092,192.168.74.70:9092 --from-beginning
--from- beginning consume from the beginning

View data through software
Create connection

Add kafka address configuration

Change to string type

Can view data

Summarize

A message is consumed once.
A message is consumed multiple times -> Data synchronization and distribution.
Most times, it is usually consumed once.

Kafka usually runs in a cluster to achieve high availability
topic (topic): logically group and save records (records and logs)

Kafka partition: In order to achieve high data availability, for example, the data of partition 0 is distributed to different kafka nodes. Each partition has one broker as the leader and one broker as the follower.

Sequential read
and write Sequential read

Monitor: Check
whether the port
curl url is 200

activemq

The port is the same as rabbitmq.
Install
wget https://mirrors.tuna.tsinghua.edu.cn/apache/activemq/5.18.2/apache-activemq-5.18.2-bin.tar.gz
cp apache-activemq-5.18.2- bin.tar.gz /apps/
cd /apps/
tar -xf apache-activemq-5.18.2-bin.tar.gz
ln -s apache-activemq-5.18.2 activemq
vi activemq.xml #No need to modify
cd...
./ bin/linux-x86-64/activemq start #Start

netstat -antp|grep 8161 Modify the address to 0.0.0.0
/usr/local/activemq/conf# vi jetty.xml

and visit
http://120.77.146.92:8161/admin/