kafka

 一、下载编译好的安装包

配置好环境变量bin/windows放到path里

先启动zookeeper,再启动server

C: oolskafka_2.12-2.4.1>zookeeper-server-start.bat configzookeeper.properties

C: oolskafka_2.12-2.4.1>kafka-server-start.bat configserver.properties

 二、创建topic

C:Users86185>kafka-topics --zookeeper 127.0.0.1:2181 --create --topic first-kafka-topic --partitions 3 --replication-factor 1
Created topic first-kafka-topic.

C:Users86185>kafka-topics --zookeeper 127.0.0.1:2181 --list
first-kafka-topic

如果用--bootstrap-server参数值为kafka server的地址

C:Users86185>kafka-topics --bootstrap-server 127.0.0.1:9092 --list
__consumer_offsets
first-kafka-topic

三、producer发消息

C:Users86185>kafka-console-producer --broker-list 127.0.0.1:9092 --topic first-kafka-topic
>first kafka topic
>second kafka topic
>third kafka topic
>

四、consumer消费消息，可以加--from-beginning从头开始消费

注意消费的时候参数是--bootstrap-server而不是--broker-list

C:Users86185>kafka-console-consumer --bootstrap-server 127.0.0.1:9092 --topic first-kafka-topic --from-beginning
first kafka topic
third kafka topic
second kafka topic

五，用kafka-consumer-groups显示消费组信息

C:Users86185>kafka-consumer-groups --bootstrap-server 127.0.0.1:9092 --describe --group my-first-application

GROUP TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
my-first-application first-kafka-topic 0 16 16 0 consumer-my-first-application-1-3aec1668-ce55-4c63-8961-e9811e325447 /192.168.1.8 consumer-my-first-application-1
my-first-application first-kafka-topic 1 13 13 0 consumer-my-first-application-1-3aec1668-ce55-4c63-8961-e9811e325447 /192.168.1.8 consumer-my-first-application-1
my-first-application first-kafka-topic 2 11 11 0 consumer-my-first-application-1-c80c459d-3e3f-43cd-850d-0cb2658272a2 /192.168.1.8 consumer-my-first-application-1

C:Users86185>kafka-consumer-groups --bootstrap-server 127.0.0.1:9092 --describe --group my-first-application

Consumer group 'my-first-application' has no active members.

GROUP TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
my-first-application first-kafka-topic 0 16 16 0 - - -
my-first-application first-kafka-topic 2 11 11 0 - - -
my-first-application first-kafka-topic 1 13 13 0 - - -

六，执行 --reset-offsets --to-earliest --execute重头开始消费

C:Users86185>kafka-consumer-groups --bootstrap-server 127.0.0.1:9092 --reset-offsets --to-earliest --execute --group my-first-application --topic first-kafka-topic

GROUP TOPIC PARTITION NEW-OFFSET
my-first-application first-kafka-topic 0 0
my-first-application first-kafka-topic 2 0
my-first-application first-kafka-topic 1 0

七，执行 --reset-offsets --shift-by -2 --execute

--shift-by -2会让每个partition都回退2，所以我的topic有3个partition,设置完shift-by，consumer重新消费的时候会有6条数据。

C:Users86185>kafka-consumer-groups --bootstrap-server 127.0.0.1:9092 --reset-offsets --shift-by -2 --execute --group my-first-application --topic first-kafka-topic

GROUP TOPIC PARTITION NEW-OFFSET
my-first-application first-kafka-topic 0 20
my-first-application first-kafka-topic 2 12
my-first-application first-kafka-topic 1 16

C:Users86185>kafka-console-consumer --bootstrap-server 127.0.0.1:9092 --topic first-kafka-topic --group my-first-application
k
n
b
i
l
m

C:Users86185>kafka-consumer-groups --bootstrap-server 127.0.0.1:9092 --describe --group my-first-application

GROUP TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
my-first-application first-kafka-topic 0 22 22 0 consumer-my-first-application-1-3ea7c558-e31f-432e-a198-526ec421d94a /192.168.1.8 consumer-my-first-application-1
my-first-application first-kafka-topic 1 18 18 0 consumer-my-first-application-1-3ea7c558-e31f-432e-a198-526ec421d94a /192.168.1.8 consumer-my-first-application-1
my-first-application first-kafka-topic 2 14 14 0 consumer-my-first-application-1-3ea7c558-e31f-432e-a198-526ec421d94a /192.168.1.8 consumer-my-first-application-1

八，遇到的问题：
1,创建topic的时候一直timeout

Caused by: org.apache.kafka.common.errors.TimeoutException: Timed out waiting for a node assignment.

解决方法：把命令中--bootstrap-server改成--zookeeper

2，创建topic时候传入--bootstrap-server地址填的是zookeeper的地址报错

[2020-03-28 21:10:31,116] WARN Exception causing close of session 0x0: Unreasonable length = 308375649 (org.apache.zookeeper.server.NIOServerCnxn)

--bootstrap-server地址应该填kafka server的地址

2，windows下删除topic后 再启动kafka server一直报错

解决：如果是在本地自己环境测试，可以删除kafka的log文件,会导致其他topic也被删除，需要慎重

3，rename log文件失败

kafka 生产消息Failed to rename [D:kafka_2.12-2.4.1/logs/controller.log] to [D:kafka_2.12-2.4.1/logs/

解决：删除zookeeper的日志即可