本文基于Kafka 0.8

在一台机器上构建一个3个节点的kafka集群，并测试producer、consumer在正常情况下的行为，以及在lead broker/follow broker失效情况下的行为

1.下载并解压kafka 0.8.0 release
$ mkdir kafka
$ wget http://apache.dataguru.cn/kafka/0.8.0/kafka_2.8.0-0.8.0.tar.gz
$ tar -zxvf kafka_2.8.0-0.8.0.tar.gz
$ cd kafka_2.8.0-0.8.0
$ ll
total 2560
drwxr-xr-x 6 root root    4096 Dec 17 17:44 ./
drwxr-xr-x 4 root root    4096 Dec 17 18:20 ../
drwxr-xr-x 3 root root    4096 Dec 17 18:16 bin/
drwxr-xr-x 2 root root    4096 Dec 17 17:43 config/
-rw-r--r-- 1 root root 2520145 Nov 27 06:21 kafka_2.8.0-0.8.0.jar
drwxr-xr-x 2 root root    4096 Nov 27 06:21 libs/
-rw-r--r-- 1 root root   12932 Nov 27 06:21 LICENSE
drwxr-xr-x 2 root root    4096 Dec 17 18:00 logs/
-rw------- 1 root root   47165 Dec 17 18:10 nohup.out
-rw-r--r-- 1 root root     162 Nov 27 06:21 NOTICE

2.启动一个单节点的zookeeper
$ nohup bin/zookeeper-server-start.sh config/zookeeper.properties &

3. 准备启动一个3个broker节点的kafka集群，因此做如下配置
$ cp config/server.properties config/server-1.properties 
$ cp config/server.properties config/server-2.properties

并做如下修改：

config/server-1.properties:
    broker.id=1
    port=9093
    log.dir=/tmp/kafka-logs-1
config/server-2.properties:
    broker.id=2
    port=9094
    log.dir=/tmp/kafka-logs-2

说明：
broker.id: broker节点的唯一标识
port: broker节点使用端口号
log.dir: 消息目录位置

4. 启动3个broker节点
$ JMX_PORT=9997 bin/kafka-server-start.sh config/server-1.properties &
$ JMX_PORT=9998 bin/kafka-server-start.sh config/server-2.properties &
$ JMX_PORT=9999 bin/kafka-server-start.sh config/server.properties &

5. 创建topic并查看
$ bin/kafka-create-topic.sh --zookeeper localhost:2181 --replica 3 --partition 1 --topic 3test
creation succeeded!

$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 2       replicas: 2,1,0 isr: 2,1,0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 1       replicas: 0,1,2 isr: 1,2,0
说明：
partiton： partion id，由于此处只有一个partition，因此partition id 为0
leader：当前负责读写的lead broker id
relicas：当前partition的所有replication broker  list
isr：relicas的子集，只包含出于活动状态的broker

6.启动consumer & producer，并在producer启动后的console输入一些信息
$ bin/kafka-console-consumer.sh --zookeeper localhost:2181 --from-beginning --topic 3test
message1
message3
message2

$ bin/kafka-console-producer.sh --broker-list localhost:9092,localhost:9093,localhost:9094 --topic 3test
message1
message3
message2

producer发送的数据consumer都能正常消费

7. 干掉follow broker
杀掉一个非lead broker（lead broker id为2）
$ pkill -9 -f server-1.properties

查看topic：
$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 2       replicas: 2,1,0 isr: 2,0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 2       replicas: 0,1,2 isr: 2,0

此时，存活的broker只有2,0
测试：produce发送消息，consumer能正常接收到

8. 继续干掉leader broker

干掉leader broker后，连续查看topic状态
$ pkill -9 -f server-2.properties                 
$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 2       replicas: 2,1,0 isr: 2,0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 2       replicas: 0,1,2 isr: 2,0
$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 2       replicas: 2,1,0 isr: 2,0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 2       replicas: 0,1,2 isr: 2,0
$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 0       replicas: 2,1,0 isr: 0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 0       replicas: 0,1,2 isr: 0
$ bin/kafka-list-topic.sh --zookeeper localhost:2181
topic: 3test    partition: 0    leader: 0       replicas: 2,1,0 isr: 0
topic: test     partition: 0    leader: 0       replicas: 0     isr: 0
topic: test_topic       partition: 0    leader: 0       replicas: 0,1,2 isr: 0
杀掉leader broker过了一会，broker 0成为新的leader broker
测试：produce发送消息，consumer能正常接收到

参考： Kafka QuickStart