阅读本教程前最好先尝试阅读：PHP下kafka的实践
自带命令实践
尝试实践的kafka知识：
- 创建话题
- 生产消息
- 消费消息
- 话题信息
- 获取消费组
- 获取消费组的offset
自带的命令
# kafka安装目录的bin目录下
# * 代表我们会使用的脚本
connect-distributed.sh kafka-log-dirs.sh kafka-streams-application-reset.sh
connect-standalone.sh kafka-mirror-maker.sh kafka-topics.sh*
kafka-acls.sh kafka-preferred-replica-election.sh kafka-verifiable-consumer.sh
kafka-broker-api-versions.sh kafka-producer-perf-test.sh kafka-verifiable-producer.sh
kafka-configs.sh kafka-reassign-partitions.sh trogdor.sh
kafka-console-consumer.sh* kafka-replay-log-producer.sh windows
kafka-console-producer.sh* kafka-replica-verification.sh zookeeper-security-migration.sh
kafka-consumer-groups.sh* kafka-run-class.sh zookeeper-server-start.sh
kafka-consumer-perf-test.sh kafka-server-start.sh zookeeper-server-stop.sh
kafka-delegation-tokens.sh kafka-server-stop.sh zookeeper-shell.sh*
kafka-delete-records.sh kafka-simple-consumer-shell.sh创建话题(kafka-topics.sh)
# 创建1个分区1个副本的test话题，这里是副本其实可以理解为broker里至少拥有数量，must >=1
# --zookeeper localhost:2181 （kafka的默认端口:2181）
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
# 创建2个分区1个副本的test02话题
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 2 --topic test02
# 列出所有话题
bin/kafka-topics.sh --list --zookeeper localhost:2181
__consumer_offsets
test
test02
# 注意这里的__consumer_offsets是kafka默认创建的，用于存储kafka消费记录的话题，我们暂时不用理会
# 列出具体话题的信息
bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic test
Topic:test PartitionCount:1 ReplicationFactor:1 Configs:
Topic: test Partition: 0 Leader: 0 Replicas: 0 Isr: 0
bin/kafka-topics.sh --describe --zookeeper localhost:2181 --topic test02
Topic:test02 PartitionCount:2 ReplicationFactor:1 Configs:
Topic: test02 Partition: 0 Leader: 0 Replicas: 0 Isr: 0
Topic: test02 Partition: 1 Leader: 0 Replicas: 0 Isr: 0
# 从上面的显示 我们可以发现，第一句是显示总体信息，下面缩进显示的是分区信息消费者(kafka-console-consumer.sh)
# 启动一个消费组消费，这里我们需要开启一个shell终端，因为会等待输出
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
# 等待输出
生产者(kafka-console-consumer.sh)
# 这里我们需要开启一个shell终端，因为会等待输入
bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
# 待我们输入消息 等待出现>
> msg01
> msg02
> msg03
#注意观察上面的消费者终端，自动输出了我们的消息
msg01
msg02
msg03查看消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
Note: This will not show information about old Zookeeper-based consumers.
console-consumer-25379
console-consumer-73410
console-consumer-27127
console-consumer-61887
console-consumer-61324
# 这里我们再来起一个消费者再次输出（因为之前的消费者我们不知道最新的这次消费组id是多少）
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
Note: This will not show information about old Zookeeper-based consumers.
console-consumer-25379
console-consumer-73410
console-consumer-27127
console-consumer-39416 # 这个是我们新起的消费组id，下面我们根据这个消费组来做实践
console-consumer-61887
console-consumer-61324
# 查看消费组的具体信息
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group console-consumer-39416
Note: This will not show information about old Zookeeper-based consumers.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
test 0 9 9 0 consumer-1-94afec29-5042-4108-8619-ba94812f10a8 /127.0.0.1 consumer-1
# 查看离线的console-consumer-25379消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group console-consumer-25379
Note: This will not show information about old Zookeeper-based consumers.
Consumer group 'console-consumer-25379' has no active members.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
test 0 5 9 4 - - -
# 查看离线的console-consumer-27127消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group console-consumer-27127
Note: This will not show information about old Zookeeper-based consumers.
Consumer group 'console-consumer-27127' has no active members.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
test 0 6 9 3 - - -
# 这里我们发现我们每次都会生成一个消费组一个消费者，不方便我们做一个消费组多个消费者测试启动一个消费组多个消费者
cp config/consumer.properties config/consumer_g1.properties
vim config/consumer_g1.properties
# 修改消费组名
group.id=test-consumer-group => group.id=test-g1
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning --consumer.config config/consumer_g1.properties
msg01
msg02
msg03
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning --consumer.config config/consumer_g1.properties
# 无输出（因为test话题我们只有一个分区，一个分区只能被同个消费组下面的一个消费者消费，所以这个就闲置了）
# 查看消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
Note: This will not show information about old Zookeeper-based consumers.
console-consumer-25379
console-consumer-73410
console-consumer-27127
console-consumer-39416
test-g1
console-consumer-61887
console-consumer-61324
# 查看test-g1消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group test-g1
Note: This will not show information about old Zookeeper-based consumers.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
test 0 9 9 0 consumer-1-43922b0c-34e0-47fe-b597-984c9e6a2884 /127.0.0.1 consumer-1
# 下面我们再开启test02的2个消费组看看情况
# 我们再为test02话题启动2个test-g1消费组的消费者
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test02 --from-beginning --consumer.config config/consumer_g1.properties
bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test02 --from-beginning --consumer.config config/consumer_g1.properties
# 查看test-g1消费组
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group test-g1
Note: This will not show information about old Zookeeper-based consumers.
TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
test02 0 0 0 0 consumer-1-90ccc960-557a-46ab-a799-58c35ee670d8 /127.0.0.1 consumer-1
test02 1 0 0 0 consumer-1-c6d79321-8212-4594-8a11-353f684c54fc /127.0.0.1 consumer-1
test 0 9 9 0 consumer-1-7a2706f7-a206-4c29-ae1f-3726ad21af96 /127.0.0.1 consumer-1
# 这里你可以在话题test产生一个消息看下，然后再test02再多产生几条消息看下，你会发现test02的2个消费组几乎是负载的消费了消息消费组的一些信息命令
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-group --members --verbose
Note: This will not show information about old Zookeeper-based consumers.
CONSUMER-ID HOST CLIENT-ID #PARTITIONS ASSIGNMENT
consumer-1-b8eeb8bc-6aa6-439b-84d8-0fcbed4a2899 /127.0.0.1 consumer-1 1 test02(1)
consumer-1-7109f789-a5cf-4862-94d0-976146dbc769 /127.0.0.1 consumer-1 1 test(0)
consumer-1-90ccc960-557a-46ab-a799-58c35ee670d8 /127.0.0.1 consumer-1 1 test02(0)
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-group --state
Note: This will not show information about old Zookeeper-based consumers.
COORDINATOR (ID) ASSIGNMENT-STRATEGY STATE #MEMBERS
localhost:9092 (0) range Stable 3
bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --delete --group console-consumer-25379zookeeper（zookeeper-shell.sh）
连接
bin/zookeeper-shell.sh 127.0.0.1:2181
Connecting to 127.0.0.1:2181
Welcome to ZooKeeper!
JLine support is disabled
WATCHER::
WatchedEvent state:SyncConnected type:None path:null常用命令
ls /
[cluster, controller_epoch, controller, brokers, zookeeper, admin, isr_change_notification, consumers, log_dir_event_notification, latest_producer_id_block, config]