启动新模拟的两台服务器
[root@localhost kafka_2.12-2.2.1]# bin/kafka-server-start.sh config/server-1.properties
[2019-06-22 18:23:56,237] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
新开连接 继续启动第三台，顺便查看下当前的进程 。发现有两个kafka存在了
[root@localhost ~]# jps
4370 ConsoleProducer
2842 QuorumPeerMain
5642 Jps
3147 Kafka
4955 ConsoleConsumer
5278 Kafka
[root@localhost ~]# cd /usr/local/kafka_2.12-2.2.1/
^C[root@localhost kafka_2.12-2.2.1]# bin/kafka-server-start.sh config/server-2.properties
[2019-06-22 18:27:31,947] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
新开一个连接 ，查看下当前进程 ，三个kafka正常启动了
[root@localhost ~]# jps
4370 ConsoleProducer
6307 Jps
2842 QuorumPeerMain
3147 Kafka
4955 ConsoleConsumer
5948 Kafka
5278 Kafka
创建一个带有备份的topic
[root@localhost kafka_2.12-2.2.1]# bin/kafka-topics.sh –create –bootstrap-server localhost:9092 –replication-factor 3 –partitions 1 –topic my-replication-topic
查看哪个borke【kafka服务器】在工作
[root@localhost kafka_2.12-2.2.1]# bin/kafka-topics.sh –describe –bootstrap-server localhost:9092 –topic my-replication-topic
Topic:my-replication-topic PartitionCount:1 ReplicationFactor:3 Configs:segment.bytes=1073741824
Topic: my-replication-topic Partition: 0 Leader: 1 Replicas: 1,2,0 Isr: 1,2,0
leader:哪个broker在读写
replicas:当前可以正常工作的kafka集群。当leader挂掉时会自动替补
isr:同步消息的列表集合
查看我们之前创建的topic消息
当时我们只有一个kafka服务器。可以看只leader是0，替被和备份的都是0，
[root@localhost kafka_2.12-2.2.1]# bin/kafka-topics.sh –describe –bootstrap-server localhost:9092 –topic test
Topic:test PartitionCount:1 ReplicationFactor:1 Configs:segment.bytes=1073741824
Topic: test Partition: 0 Leader: 0 Replicas: 0 Isr: 0
在新的topic中发布新的消息
[root@localhost kafka_2.12-2.2.1]# bin/kafka-console-producer.sh –broker-list localhost:9092 –topic my-replication-topic
>message one
>message two
消费者去获取消息
[root@localhost kafka_2.12-2.2.1]# bin/kafka-console-consumer.sh –bootstrap-server localhost:9092 –from-beginning –topic my-replication-topic
message one
message two
检查当前的leader
[root@localhost kafka_2.12-2.2.1]# bin/kafka-topics.sh –describe –bootstrap-server localhost:9092 –topic my-replication-topic
Topic:my-replication-topic PartitionCount:1 ReplicationFactor:3 Configs:segment.bytes=1073741824
Topic: my-replication-topic Partition: 0 Leader: 1 Replicas: 1,2,0 Isr: 1,2,0
模拟leader1挂掉以后的状态
把leader1关掉
检查leader1的进程
ps aux 显示用户当前的所有进程 。并根据grep后面的内容进行搜索
用kill杀死相关进程
[root@localhost kafka_2.12-2.2.1]# ps aux | grep server-1.properties
root 5278 3.5 20.5 3232460 205560 pts/5 Sl+ 18:23 1:06 /usr/local/jdk1.8.0_211/bin/java -Xmx1G
[root@localhost kafka_2.12-2.2.1]# kill -9 5278
再次检查当前topic的消息
发现leader已经从1变成了2.
[root@localhost kafka_2.12-2.2.1]# bin/kafka-topics.sh –describe –bootstrap-server localhost:9092 –topic my-replication-topic
Topic:my-replication-topic PartitionCount:1 ReplicationFactor:3 Configs:segment.bytes=1073741824
Topic: my-replication-topic Partition: 0 Leader: 2 Replicas: 1,2,0 Isr: 2,0
使用kafka connect 导入导出数据
souce connector 从text.txt读取文件 ，把内容发送到connect-test., sink connector 从conect-test读写消息
[root@localhost kafka_2.12-2.2.1]# bin/connect-standalone.sh config/connect-standalone.properties config/connect-file-source.properties config/connect-file-sink.properties
[2019-06-22 19:05:55,493] INFO Kafka Connect standalone worker initializing … (org.apache.kafka.connect.cli.ConnectStandalone:67)
进行jps分发现多了一个ConnectStandalone的进程
[root@localhost ~]# jps
4370 ConsoleProducer
9478 Jps
9160 ConnectStandalone
2842 QuorumPeerMain
3147 Kafka
4955 ConsoleConsumer
5948 Kafka
显示文件内容
more 命令类似 cat ，不过会以一页一页的形式显示，更方便使用者逐页阅读，
[root@localhost kafka_2.12-2.2.1]# more test.sink.txt
foo
bar
使用消费者控制 台显示
[root@localhost kafka_2.12-2.2.1]# bin/kafka-console-consumer.sh –bootstrap-server localhost:9092 –topic connect-test –from-beginning
{“schema”:{“type”:”string”,”optional”:false},”payload”:”foo”}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”bar”}
继续测试
生产者进行消息追加
[root@localhost kafka_2.12-2.2.1]# echo -e “foo\nbarddddaaa\aaaaa\dddd\1\2\2\3” > test.txt
[root@localhost kafka_2.12-2.2.1]# echo -e “foo\nbarddddaaa\aaaaa\dddd\1\2\2\3\new append” > test.txt
消费者进行实时显示
[root@localhost kafka_2.12-2.2.1]# bin/kafka-console-consumer.sh –bootstrap-server localhost:9092 –topic connect-test –from-beginning
{“schema”:{“type”:”string”,”optional”:false},”payload”:”foo”}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”bar”}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”dddd”}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”aaaaaaad”}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”dd”}
^[[A^[[A^[[B{“schema”:{“type”:”string”,”optional”:false},”payload”:”1\\2\\2\\3″}
{“schema”:{“type”:”string”,”optional”:false},”payload”:”ew append”}