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kafka太强大了,而shell脚本也很多,网上查了查资料,这里当自己学习记录一下。
kafka安装目录下的bin目录包含了很多运维可操作的shell脚本,列举如下:
脚本名称 | 用途描述 |
---|---|
connect-distributed.sh | 连接kafka集群模式 |
connect-standalone.sh | 连接kafka单机模式 |
kafka-acls.sh | todo |
kafka-broker-api-versions.sh | todo |
kafka-configs.sh | 配置管理脚本 |
kafka-console-consumer.sh | kafka消费者控制台 |
kafka-console-producer.sh | kafka生产者控制台 |
kafka-consumer-groups.sh | kafka消费者组相关信息 |
kafka-consumer-perf-test.sh | kafka消费者性能测试脚本 |
kafka-delegation-tokens.sh | todo |
kafka-delete-records.sh | 删除低水位的日志文件 |
kafka-log-dirs.sh | kafka消息日志目录信息 |
kafka-mirror-maker.sh | 不同数据中心kafka集群复制工具 |
kafka-preferred-replica-election.sh | 触发preferred replica选举 |
kafka-producer-perf-test.sh | kafka生产者性能测试脚本 |
kafka-reassign-partitions.sh | 分区重分配脚本 |
kafka-replay-log-producer.sh | todo |
kafka-replica-verification.sh | 复制进度验证脚本 |
kafka-run-class.sh | todo |
kafka-server-start.sh | 启动kafka服务 |
kafka-server-stop.sh | 停止kafka服务 |
kafka-simple-consumer-shell.sh | deprecated,推荐使用kafka-console-consumer.sh |
kafka-streams-application-reset.sh | todo |
kafka-topics.sh | topic管理脚本 |
kafka-verifiable-consumer.sh | 可检验的kafka消费者 |
kafka-verifiable-producer.sh | 可检验的kafka生产者 |
trogdor.sh | todo |
zookeeper-security-migration.sh | todo |
zookeeper-server-start.sh | 启动zk服务 |
zookeeper-server-stop.sh | 停止zk服务 |
zookeeper-shell.sh | zk客户端 |
接下来详细说明每个脚本的使用方法。
Kafka Connect是在0.9以后加入的功能,主要是用来将其他系统的数据导入到Kafka,然后再将Kafka中的数据导出到另外的系统。可以用来做实时数据同步的ETL,数据实时分析处理等。
主要有2种模式:Standalone(单机模式)和Distribute(分布式模式)。
单机主要用来开发,测试,分布式的用于生产环境。
用法比较复杂,建议参考:Kafka Connect教程详解 https://3gods.com/bigdata/Kafka-Connect-Details.html
用法:bin/kafka-broker-api-versions.sh --bootstrap-server 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094
配置管理脚本,这个脚本主要分两类用法:describe和alter。
describe相关用法:
查看每个topic的配置:bin/kafka-configs.sh --zookeeper localhost:2181 --describe --entity-type topics
部分结果如下:
- Configs for topic 'afei' are
- Configs for topic 'TOPIC-TEST-AFEI' are retention.ms=600000
- Configs for topic '__consumer_offsets' are segment.bytes=104857600,cleanup.policy=compact,compression.type=producer
查看broker的配置:bin/kafka-configs.sh --bootstrap-server localhost:9092 --describe --entity-type brokers --entity-name 0
说明:0是broker.id,因为entity-type为brokers,所以entity-name表示broker.id。
alter相关用法:
给指定topic增加配置:bin/kafka-configs.sh --zookeeper localhost:2181 --alter --entity-type topics --entity-name TOPIC-TEST-AFEI --add-config retention.ms=600000
给指定topic删除配置:bin/kafka-configs.sh --zookeeper localhost:2181 --alter --entity-type topics --entity-name TOPIC-TEST-AFEI --delete-config max.message.bytes
通过该脚本可以管理的属性,可以通过执行
bin/kafka-configs.sh
得到的输出中--add-config
的desc可以得到。
用法:bin/kafka-broker-api-versions.sh --bootstrap-server localhost:9092
用法:bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic afei [--group groupName] [--partition 目标分区]
这个命令后面还可带很多参数:--key-deserializer
:指定key的反序列化方式,默认是 org.apache.kafka.common.serialization.StringDeserializer--value-deserializer
:指定value的反序列化方式,默认是 org.apache.kafka.common.serialization.StringDeserializer--from-beginning
:从最早的消息开始消费,默认是从最新消息开始消费。--offset
: 从指定的消息位置开始消费,如果设置了这个参数,还需要带上--partition
。否则会提示:The partition is required when offset is specified.--timeout-ms
:当消费者在这个参数指定时间间隔内没有收到消息就会推出,并抛出异常:kafka.consumer.ConsumerTimeoutException。--whitelist
:接收的topic白名单集合,和--topic
二者取其一。例如:--whitelist "afei.*"
(以afei开头的topic),--whitelist "afei"
(指定afei这个topic),"afei|fly"
(指定afei或者fly这两个topic)。另外一个参数--blacklist
用法类似。
用法:bin/kafka-console-producer.sh --broker-list localhost:9092 --topic afei
,如果连接集群,那么broker-list参数格式为:HOST1:PORT1,HOST2:PORT2,HOST3:PORT3
这个命令后面还可带很多参数:--key-serializer
:指定key的序列化方式,默认是 org.apache.kafka.common.serialization.StringSerializer--value-serializer
:指定value的序列化方式,默认是 org.apache.kafka.common.serialization.StringSerializer
查看所有消费者组:bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
查看某个消费者组:bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group AfeiGroup --describe,输出结果如下:
- Note: This will not show information about old Zookeeper-based consumers.
-
- TOPIC PARTITION CURRENT-OFFSET LOG-END-OFFSET LAG CONSUMER-ID HOST CLIENT-ID
- afei 0 8 8 0 consumer-1-7a46c647-8221-4aca-b6bf-ed14571fb0f1 /172.18.36.203 consumer-1
- afei 4 10 10 0 consumer-1-7a46c647-8221-4aca-b6bf-ed14571fb0f1 /172.18.36.203 consumer-1
- afei 1 8 8 0 consumer-1-7a46c647-8221-4aca-b6bf-ed14571fb0f1 /172.18.36.203 consumer-1
- afei 3 6 6 0 consumer-1-7a46c647-8221-4aca-b6bf-ed14571fb0f1 /172.18.36.203 consumer-1
- afei 2 9 9 0 consumer-1-7a46c647-8221-4aca-b6bf-ed14571fb0f1 /172.18.36.203 consumer-1
-
perf是performance的缩写,所以这个脚本是kafka消费者性能测试脚本。
用法:bin/kafka-consumer-perf-test.sh --broker-list localhost:9092 --group testGroup --topic afei --messages 1024
输出结果如下:
- start.time, end.time, data.consumed.in.MB, MB.sec, data.consumed.in.nMsg, nMsg.sec, rebalance.time.ms, fetch.time.ms, fetch.MB.sec, fetch.nMsg.sec
- 2018-07-02 22:49:10:068, 2018-07-02 22:49:12:077, 0.0001, 0.0001, 41, 20.4082, 19, 1990, 0.0001, 20.6030
用法:bin/kafka-delete-records.sh --bootstrap-server 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 --offset-json-file offset.json,offset.json文件内容:
- {
- "partitions": [{
- "topic": "afei",
- "partition": 3,
- "offset": 10
- }],
- "version": 1
- }
执行结果如下,表示删除afei这个topic下分区为3的offset少于10的消息日志(不会删除offset=10的消息日志):
- Executing records delete operation
- Records delete operation completed:
- partition: afei-3 low_watermark: 10
用法:bin/kafka-log-dirs.sh --bootstrap-server localhost:9092 --describe --topic-list afei[,topicName2,topicNameN],如果没有指定--topic-list
,那么会输出所有kafka消息日志目录以及目录下所有topic信息。加上--topic-list
参数后,输出结果如下,由这段结果可知,消息日志所在目录为/data/kafka-logs
,并且afei这个topic有3个分区:
- {
- "version": 1,
- "brokers": [{
- "broker": 0,
- "logDirs": [{
- "logDir": "/data/kafka-logs",
- "error": null,
- "partitions": [{
- "partition": "afei-1",
- "size": 567,
- "offsetLag": 0,
- "isFuture": false
- }, {
- "partition": "afei-2",
- "size": 639,
- "offsetLag": 0,
- "isFuture": false
- }, {
- "partition": "afei-0",
- "size": 561,
- "offsetLag": 0,
- "isFuture": false
- }]
- }]
- }]
- }
用法:bin/kafka-preferred-replica-election.sh --zookeeper 10.0.55.208:2181/wallet,10.0.55.209:2181/wallet,10.0.55.210:2181/wallet --path-to-json-file afei-preferred.json(如果不带--path-to-json-file就是对所有topic进行preferred replica election),json文件内容如下::
- {
- "partitions": [{
- "topic": "afei",
- "partition": 0
- },
- {
- "topic": "afei",
- "partition": 1
- },
- {
- "topic": "afei",
- "partition": 2
- }]
- }
-
场景:在创建一个topic时,kafka尽量将partition均分在所有的brokers上,并且将replicas也均分在不同的broker上。每个partitiion的所有replicas叫做"assigned replicas","assigned replicas"中的第一个replicas叫"preferred replica",刚创建的topic一般"preferred replica"是leader。leader replica负责所有的读写。其他replica只是冷备状态,不接受读写请求。但随着时间推移,broker可能会主动停机甚至客观宕机,会发生leader选举迁移,导致机群的负载不均衡。我们期望对topic的leader进行重新负载均衡,让partition选择"preferred replica"做为leader。
kafka提供了一个参数auto.leader.rebalance.enable
自动做这件事情,且默认为true,原理是一个后台线程检查并触发leader balance。但是并不建议把这个参数设置为true。因为担心这个自动选举发生在业务高峰期,从而导致影响业务。
验证:
操作比较简单,常见一个3个分区3个副本的topic,然后kill掉一个broker。这时候topic信息如下,我们可以看到broker.id为0的broker上有两个leader:
- Topic:afei PartitionCount:3 ReplicationFactor:3 Configs:
- Topic: afei Partition: 0 Leader: 0 Replicas: 0,1,2 Isr: 0,1,2
- Topic: afei Partition: 1 Leader: 1 Replicas: 1,2,0 Isr: 0,1,2
- Topic: afei Partition: 2 Leader: 0 Replicas: 2,0,1 Isr: 0,1,2
执行kafka-preferred-replica-election.sh
脚本后,topic信息如下,leader均匀分布在3个不同的broker上,
- Topic:afei PartitionCount:3 ReplicationFactor:3 Configs:
- Topic: afei Partition: 0 Leader: 0 Replicas: 0,1,2 Isr: 0,1,2
- Topic: afei Partition: 1 Leader: 1 Replicas: 1,2,0 Isr: 0,1,2
- Topic: afei Partition: 2 Leader: 2 Replicas: 2,0,1 Isr: 0,1,2
perf是performance的缩写,所以这个脚本是kafka生产者性能测试脚本。
场景:将一些topic上的分区从当前所在broker移到其他比如新增的broker上。假设有个名为ORDER-DETAIL的topic,在broker.id为2的broker上:
- Topic:ORDER-DETAIL PartitionCount:1 ReplicationFactor:1 Configs:
- Topic: ORDER-DETAIL Partition: 0 Leader: 2 Replicas: 2 Isr: 2
现在想要把它移动到broker.id为1的broker上,执行脚本:bin/kafka-reassign-partitions.sh --zookeeper 10.0.55.208:2181/wallet,10.0.55.209:2181/wallet,10.0.55.210:2181/wallet --topics-to-move-json-file move.json --broker-list "1" --generate
--generate
参数表示生成一个分区再分配配置,并不会真正的执行,命令执行结果如下:
- Current partition replica assignment
- {"version":1,"partitions":[{"topic":"ORDER-DETAIL","partition":0,"replicas":[2],"log_dirs":["any"]}]}
-
- Proposed partition reassignment configuration
- {"version":1,"partitions":[{"topic":"ORDER-DETAIL","partition":0,"replicas":[1],"log_dirs":["any"]}]}
我们只需要把第二段json内容保存到一个新建的final.json文件中(如果知道如何编写这段json内容,那么也可以不执行第一条命令),然后执行命令:bin/kafka-reassign-partitions.sh --zookeeper 10.0.55.208:2181/wallet,10.0.55.209:2181/wallet,10.0.55.210:2181/wallet --reassignment-json-file move_final.json --execute,此次执行的命令带有--execute
参数,说明是真正的执行分区重分配。
通过这个命令还可以给某个topic增加副本,例如有一个名为ORDER-DETAIL的topic,有3个分区,但是只有1个副本,为了高可用,需要将副本数增加到2,那么编写replica.json文本内容如下:
- {
- "version": 1,
- "partitions": [{
- "topic": "ORDER-DETAIL",
- "partition": 0,
- "replicas": [1, 2]
- },
- {
- "topic": "ORDER-DETAIL",
- "partition": 1,
- "replicas": [0, 2]
- },
- {
- "topic": "ORDER-DETAIL",
- "partition": 2,
- "replicas": [1, 0]
- }]
- }
然后执行命令即可:bin/kafka-reassign-partitions.sh --zookeeper 10.0.55.208:2181/wallet,10.0.55.209:2181/wallet,10.0.55.210:2181/wallet --reassignment-json-file replica.json
用法:bin/kafka-replica-verification.sh --broker-list 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 [--topic-white-list afei],参数--topic-white-list指定要检查的目标topic。输出结果如下,如果输出信息为max lag is 0 for ...
表示这个topic的复制没有任何延迟:
- 2018-07-03 15:04:46,889: verification process is started.
- 2018-07-03 15:05:16,811: max lag is 0 for partition multi-1 at offset 0 among 5 partitions
- 2018-07-03 15:05:46,812: max lag is 0 for partition multi-1 at offset 0 among 5 partitions
- ... ...
用法:bin/kafka-server-start.sh -daemon config/server.properties,指定配置文件并以守护进程模式启动。
用法:bin/kafka-server-stop.sh 。说明,这个命令会kill掉当前服务器上所有kafka broker。但是这个脚本可能执行结果为:No kafka server to stop
分析原因:我们先看一下kafka-server-stop.sh
脚本内容,这个脚本非常简单,就是得到所有包含kafka.Kafka的进程ID,但是由于kafka启动依赖比较多的jar,导致kafka进程的ps
结果输出内容比较长,而ps
输出结果受到PAGE_SIZE
(其值通过命令getconf PAGE_SIZE
可以得到)的限制,从而导致ps
结果中看不到kafka\.Kafka
,所以不能kill掉kafka server:
- SIGNAL=${SIGNAL:-TERM}
- PIDS=$(ps ax | grep -i 'kafka\.Kafka' | grep java | grep -v grep | awk '{print $1}')
-
- if [ -z "$PIDS" ]; then
- echo "No kafka server to stop"
- exit 1
- else
- kill -s $SIGNAL $PIDS
- fi
为了kafka-server-stop.sh脚本可以正常执行,建议修改脚本如下,通过bin脚本所在目录的上级目录来查找进程ID,从而kill相关进程:
- cd `dirname $0`
- BIN_DIR=`pwd`
- cd ..
- DEPLOY_DIR=`pwd`
- SIGNAL=${SIGNAL:-TERM}
-
- PIDS=$(ps ax | grep -i "${DEPLOY_DIR}" | grep java | grep -v grep | awk '{print $1}')
-
- if [ -z "$PIDS" ]; then
- echo "No kafka server to stop"
- exit 1
- else
- kill -s $SIGNAL $PIDS
- fi
deprecated,用法:bin/kafka-simple-consumer-shell.sh --broker-list 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 --topic afei
创建topic: bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic afei --partitions 3 --replication-factor 1
删除topic: bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic test
修改topic: bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic afei --partitions 5,修改topic时只能增加分区数量。
查询topic: bin/kafka-topics.sh --zookeeper localhost:2181 --describe [ --topic afei ],查询时如果带上--topic topicName
,那么表示只查询该topic的详细信息。这时候还可以带上--unavailable-partitions
和--under-replicated-partitions
任意一个参数。
创建TOPIC:
./kafka-topics.sh --create --zookeeper centos_1:2181 --replication-factor 1 --partitions 1 --topic wangcheng_test
查看TOPIC是否创建成功:
./kafka-topics.sh --list --zookeeper centos_1:2181 wangcheng_test
用法:bin/kafka-verifiable-consumer.sh --broker-list 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 --topic afei --group-id groupName
这个脚本的作用是接收指定topic的消息消费,并发出消费者事件,例如:offset提交等。
用法:bin/kafka-verifiable-producer.sh --broker-list 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 --topic afei [--max-messages 64],建议使用该脚本时增加参数--max-messages
,否则会不停的发送消息。
这个脚本的作用是持续发送消息到指定的topic中,参数--max-messages
限制最大发送消息数。且每条发送的消息都会有响应信息,这就是和kafka-console-producer.sh
最大的不同:
- [mwopr@jtcrtvdra35 kafka_2.12-1.1.0]$ bin/kafka-verifiable-producer.sh --broker-list 10.0.55.229:9092,10.0.55.229:9093,10.0.55.229:9094 --topic afei --max-messages 9
- {"timestamp":1530515959900,"name":"startup_complete"}
- {"timestamp":1530515960310,"name":"producer_send_success","key":null,"value":"1","offset":5,"topic":"afei","partition":0}
- {"timestamp":1530515960315,"name":"producer_send_success","key":null,"value":"4","offset":6,"topic":"afei","partition":0}
- {"timestamp":1530515960315,"name":"producer_send_success","key":null,"value":"7","offset":7,"topic":"afei","partition":0}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"0","offset":5,"topic":"afei","partition":1}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"3","offset":6,"topic":"afei","partition":1}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"6","offset":7,"topic":"afei","partition":1}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"2","offset":6,"topic":"afei","partition":2}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"5","offset":7,"topic":"afei","partition":2}
- {"timestamp":1530515960316,"name":"producer_send_success","key":null,"value":"8","offset":8,"topic":"afei","partition":2}
- {"timestamp":1530515960333,"name":"shutdown_complete"}
- {"timestamp":1530515960334,"name":"tool_data","sent":9,"acked":9,"target_throughput":-1,"avg_throughput":20.689655172413794}
afei这个topic有3个分区,使用kafka-verifiable-producer.sh发送9条消息。根据输出结果可以看出,往每个分区发送了3条消息。另外,我们可以通过设置参数
--max-messages
一个比较大的值,可以压测一下搭建的kafka集群环境。
用法:bin/zookeeper-shell.sh localhost:2181[/path],如果kafka集群的zk配置了chroot路径,那么需要加上/path,例如bin/zookeeper-shell.sh localhost:2181/mykafka
,登陆zk后,就可以查看kafka写在zk上的节点信息。例如查看有哪些broker,以及broker的详细信息:
- ls /brokers/ids
- [0]
- get /brokers/ids/0
- {"listener_security_protocol_map":{"PLAINTEXT":"PLAINTEXT"},"endpoints":["PLAINTEXT://izwz91rhzhed2c54e6yx87z:9092"],"jmx_port":-1,"host":"izwz91rhzhed2c54e6yx87z","timestamp":"1530435834272","port":9092,"version":4}
- cZxid = 0x2d3
- ctime = Sun Jul 01 17:03:54 CST 2018
- mZxid = 0x2d3
- mtime = Sun Jul 01 17:03:54 CST 2018
- pZxid = 0x2d3
- cversion = 0
- dataVersion = 0
- aclVersion = 0
- ephemeralOwner = 0x1642cb09421006c
- dataLength = 216
- numChildren = 0
上面的这些kafka运维脚本,有些是指定参数--zookeeper,有些是指定参数--broker-list,有些是指定参数--bootstrap-server。
这实际上是历史问题。broker-list代表broker地址,而bootstrap-server代表连接起点,可以从中拉取broker地址信息(前面的[4. kafka生产者&消费者]已经分析过)。bootstrap-server的命名更高级点。还有通过zookeeper连接的,kafka早起很多信息存方在zk中,后期慢慢弱化了zk的作用,这三个参数代表kafka的三个时代。往好的讲是见证kafka设计的理念变迁,往坏的讲:什么**玩意儿,绕的一笔(来自厮大大的解答),哈。
./kafka-topics.sh --create --zookeeper centos_1:2181 --replication-factor 1 --partitions 1 --topic wangcheng_test
./kafka-topics.sh --list --zookeeper centos_1:2181 wangcheng_test
./kafka-console-producer.sh --broker-list centos_1:9092 --topic wangcheng_test
./kafka-console-consumer.sh --zookeeper localhost:2181 --topic wangcheng_test --from-beginning
到此为止说明集群正确
1、创建3个备份的topic
./kafka-topics.sh --create --zookeeper centos_1:2181 --replication-factor 3 --partitions 1 --topic topic_1
2、查看topic_1的状态
./kafka-topics.sh --describe --zookeeper centos_2:2181 --topic topic_1
Topic:topic_1 PartitionCount:1 ReplicationFactor:3 Configs:
Topic: topic_1 Partition: 0 Leader: 2 Replicas: 2,1,3 Isr: 2,1,3
可以看到当前的Partition数量为1,ReplicationFactor备份数为3,leader是2
向centos_2中的kafka发信息:
./kafka-console-producer.sh --broker-list centos_2:9092 --topic topic_1
topic_1_test
我们将centos_2上的kafka进程关闭,在centos_2上开启一个consumer:
./kafka-console-consumer.sh --zookeeper localhost:2181 --topic topic_1 --from-beginning
Using the ConsoleConsumer with old consumer is deprecated and will be removed in a future major release. Consider using the new consumer by passing [bootstrap-server] instead of [zookeeper].
topic_1_test
再查看下topic_1的status:
- ./kafka-topics.sh --describe --zookeeper centos_2:2181 --topic topic_1
- Topic:topic_1 PartitionCount:1 ReplicationFactor:3 Configs:
- Topic: topic_1 Partition: 0 Leader: 1 Replicas: 2,1,3 Isr: 1,3
leader变成了1,ISR变成了1,3
重启2,再查看状态:
- ./kafka-topics.sh --describe --zookeeper centos_2:2181 --topic topic_1
- Topic:topic_1 PartitionCount:1 ReplicationFactor:3 Configs:
- Topic: topic_1 Partition: 0 Leader: 1 Replicas: 2,1,3 Isr: 1,3,2
Isr变回了1,3,2
再试下先关闭centos_1上的进程,发送再重启看下现象:
- [root@centos_1 bin]# jps -l
- 11525 kafka.Kafka
- 14341 sun.tools.jps.Jps
- 7532 org.apache.zookeeper.server.quorum.QuorumPeerMain
- [root@centos_1 bin]# kill 11525
- [root@centos_1 bin]# jps -l
- 14357 sun.tools.jps.Jps
- 7532 org.apache.zookeeper.server.quorum.QuorumPeerMain
- [root@centos_1 bin]# ./kafka-topics.sh --describe --zookeeper centos_2:2181 --topic topic_1
- Topic:topic_1 PartitionCount:1 ReplicationFactor:3 Configs:
- Topic: topic_1 Partition: 0 Leader: 2 Replicas: 2,1,3 Isr: 3,2
- [root@centos_1 bin]# ./kafka-console-producer.sh --broker-list centos_2:9092 --topic topic_1
- >2345678
- [root@centos_2 bin]# ./kafka-console-consumer.sh --zookeeper localhost:2181 --topic topic_1 --from-beginning
- Using the ConsoleConsumer with old consumer is deprecated and will be removed in a future major release. Consider using the new consumer by passing [bootstrap-server] instead of [zookeeper].
- topic_1_test
- 2345678
- [root@centos_1 bin]# ./kafka-server-start.sh ../config/server.properties &
- [root@centos_1 bin]# ./kafka-topics.sh --describe --zookeeper centos_2:2181 --topic topic_1
- Topic:topic_1 PartitionCount:1 ReplicationFactor:3 Configs:
- Topic: topic_1 Partition: 0 Leader: 2 Replicas: 2,1,3 Isr: 3,2,1
根据以上现象说明,broker重启会重新拉取副本信息
https://www.jianshu.com/p/3ed342a28a9d
https://www.jianshu.com/p/5ed30e789b0f
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