環(huán)境是linux，4臺機(jī)器，版本3.6，kafka安裝在node 1 2 3 上，zookeeper安裝在node2 3 4上。
安裝好kafka，進(jìn)入bin目錄，可以看到有很多sh文件，是我們執(zhí)行命令的基礎(chǔ)。
啟動kafka，下面的命令的后面帶的配置文件的相對路徑
kafka-server-start.sh ./server.properties
遇到不熟悉的sh文件，直接輸入名字并回車，就會提示你可用的命令參數(shù)。如果參數(shù)用錯了，kafka也會提示你相應(yīng)的錯誤。
[root@localhost bin]# kafka-topics.sh
Create, delete, describe, or change a topic.
Option Description
------ -----------
--alter Alter the number of partitions and
replica assignment. Update the
configuration of an existing topic
via --alter is no longer supported
here (the kafka-configs CLI supports
altering topic configs with a --
bootstrap-server option).
--at-min-isr-partitions if set when describing topics, only
show partitions whose isr count is
equal to the configured minimum.
--bootstrap-server <String: server to REQUIRED: The Kafka server to connect
connect to> to.
--command-config <String: command Property file containing configs to be
config property file> passed to Admin Client. This is used
only with --bootstrap-server option
for describing and altering broker
configs.
--config <String: name=value> A topic configuration override for the
topic being created or altered. The
following is a list of valid
configurations:
cleanup.policy
compression.type
delete.retention.ms
file.delete.delay.ms
flush.messages
flush.ms
follower.replication.throttled.
replicas
index.interval.bytes
leader.replication.throttled.replicas
local.retention.bytes
local.retention.ms
max.compaction.lag.ms
max.message.bytes
message.downconversion.enable
message.format.version
message.timestamp.after.max.ms
message.timestamp.before.max.ms
message.timestamp.difference.max.ms
message.timestamp.type
min.cleanable.dirty.ratio
min.compaction.lag.ms
min.insync.replicas
preallocate
remote.storage.enable
retention.bytes
retention.ms
segment.bytes
segment.index.bytes
segment.jitter.ms
segment.ms
unclean.leader.election.enable
See the Kafka documentation for full
details on the topic configs. It is
supported only in combination with --
create if --bootstrap-server option
is used (the kafka-configs CLI
supports altering topic configs with
a --bootstrap-server option).
--create Create a new topic.
--delete Delete a topic
--delete-config <String: name> A topic configuration override to be
removed for an existing topic (see
the list of configurations under the
--config option). Not supported with
the --bootstrap-server option.
--describe List details for the given topics.
--exclude-internal exclude internal topics when running
list or describe command. The
internal topics will be listed by
default
--help Print usage information.
--if-exists if set when altering or deleting or
describing topics, the action will
only execute if the topic exists.
--if-not-exists if set when creating topics, the
action will only execute if the
topic does not already exist.
--list List all available topics.
--partitions <Integer: # of partitions> The number of partitions for the topic
being created or altered (WARNING:
If partitions are increased for a
topic that has a key, the partition
logic or ordering of the messages
will be affected). If not supplied
for create, defaults to the cluster
default.
--replica-assignment <String: A list of manual partition-to-broker
broker_id_for_part1_replica1 : assignments for the topic being
broker_id_for_part1_replica2 , created or altered.
broker_id_for_part2_replica1 :
broker_id_for_part2_replica2 , ...>
--replication-factor <Integer: The replication factor for each
replication factor> partition in the topic being
created. If not supplied, defaults
to the cluster default.
--topic <String: topic> The topic to create, alter, describe
or delete. It also accepts a regular
expression, except for --create
option. Put topic name in double
quotes and use the '\' prefix to
escape regular expression symbols; e.
g. "test\.topic".
--topic-id <String: topic-id> The topic-id to describe.This is used
only with --bootstrap-server option
for describing topics.
--topics-with-overrides if set when describing topics, only
show topics that have overridden
configs
--unavailable-partitions if set when describing topics, only
show partitions whose leader is not
available
--under-min-isr-partitions if set when describing topics, only
show partitions whose isr count is
less than the configured minimum.
--under-replicated-partitions if set when describing topics, only
show under replicated partitions
--version Display Kafka version.
如這里，我們創(chuàng)建一個topic名為test。
kafka-topics.sh --create --topic test --bootstrap-server node1:9092 --partitions 2 --replication-factor 2
Created topic test.
連接其中node1上的kafka獲得metedata里的topic列表
[root@localhost bin]# kafka-topics.sh --list --bootstrap-server node1:9092
test
查看某個topic的細(xì)節(jié)
[root@localhost bin]# kafka-topics.sh --describe --topic test --bootstrap-server node1:9092
Topic: test TopicId: WgjG4Ou_Q7iQvzgipRgzjg PartitionCount: 2 ReplicationFactor: 2 Configs:
Topic: test Partition: 0 Leader: 2 Replicas: 2,1 Isr: 2,1
Topic: test Partition: 1 Leader: 3 Replicas: 3,2 Isr: 3,2
在其中的一臺機(jī)器上起一個生產(chǎn)者，在其他兩臺機(jī)器上起2個消費(fèi)者，都在同一個組里。
[root@localhost bin]# kafka-console-producer.sh --broker-list node1:9092 --topic test
>hello 03
>1
>2
>3
>4
>5
>6
>7
>8
可以看到同一個組內(nèi)，如果組內(nèi)消費(fèi)者注冊情況不變化有且只有同一個consumer能夠消費(fèi)數(shù)據(jù)。可以滿足對于消息要求順序性，不能并發(fā)消費(fèi)的情況。
[root@localhost bin]# kafka-console-consumer.sh --bootstrap-server node1:9092 --topic test --group msb
hello 03
1
2
3
4
5
6
7
8
查看某個組內(nèi)的情況
[root@localhost bin]# kafka-consumer-groups.sh --bootstrap-server node2:9092 --group msb --describe
GROUP TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
msb test 1 24 24 0 console-consumer-4987804d-6e59-4f4d-9952-9afb9aff6cbe /192.168.184.130 console-consumer
msb test 0 0 0 0 console-consumer-242992e4-7801-4a38-a8f3-8b44056ed4b6 /192.168.184.130 console-consumer
最后看一下zk中的情況吧。
zk根目錄下多了一個kafka節(jié)點(diǎn)
[zk: localhost:2181(CONNECTED) 1] ls /
[kafka, node1, node6, node7, testLock, zookeeper]
kafka下面有很多metedata信息，包含在這些節(jié)點(diǎn)中，如，，文章來源：http://www.zghlxwxcb.cn/news/detail-743729.html
[zk: localhost:2181(CONNECTED) 2] ls /kafka
[admin, brokers, cluster, config, consumers, controller, controller_epoch, feature, isr_change_notification, latest_producer_id_block, log_dir_event_notification]
#集群id
[zk: localhost:2181(CONNECTED) 3] ls /kafka/cluster
[id]
[zk: localhost:2181(CONNECTED) 5] get /kafka/cluster/id
{"version":"1","id":"8t14lxoAS1SdXapY6ysw_A"}
#controller的id
[zk: localhost:2181(CONNECTED) 6] get /kafka/controller
{"version":2,"brokerid":3,"timestamp":"1698841142070","kraftControllerEpoch":-1}
可以看到topics中有一個__consumer_offsets，是kafka用來存儲offset的topic。文章來源地址http://www.zghlxwxcb.cn/news/detail-743729.html
[zk: localhost:2181(CONNECTED) 10] ls /kafka/brokers/topics
[__consumer_offsets, test]
[zk: localhost:2181(CONNECTED) 12] get /kafka/brokers/topics/__consumer_offsets
{"partitions":{"44":[1],"45":[2],"46":[3],"47":[1],"48":[2],"49":[3],"10":[3],"11":[1],"12":[2],"13":[3],"14":[1],"15":[2],"16":[3],"17":[1],"18":[2],"19":[3],"0":[2],"1":[3],"2":[1],"3":[2],"4":[3],"5":[1],"6":[2],"7":[3],"8":[1],"9":[2],"20":[1],"21":[2],"22":[3],"23":[1],"24":[2],"25":[3],"26":[1],"27":[2],"28":[3],"29":[1],"30":[2],"31":[3],"32":[1],"33":[2],"34":[3],"35":[1],"36":[2],"37":[3],"38":[1],"39":[2],"40":[3],"41":[1],"42":[2],"43":[3]},"topic_id":"RGxJyefAQlKrmY3LTVbKGw","adding_replicas":{},"removing_replicas":{},"version":3}
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