在使用kafka时，初期创建topic时所指定的topic属性有时会需要修改，如何动态修改kafka topic属性？kafka提供了命令行工具—kafka-topics.sh.

kafka-topics.sh工具介绍

kafka-topics.sh工具也是我们用来创建topic、查看topic详情的工具。
直接运行kafka-topics.sh可以看出，它是用来创建、删除、查看以及更新topic的
root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ./kafka-topics.sh
Create, delete, describe, or change a topic.
Option Description

----

–alter Alter the number of partitions,
replica assignment, and/or
configuration for the topic.
–config A topic configuration override for
…

更新或者修改topic
注意：我的kafka版本是1.1.0， 并且我只有一个broker。
1， 首先我们创建一个topic，然后查看详情
root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ./kafka-topics.sh –create –zookeeper 192.168.119.131:2181 –replication-factor 1 –partitions 4 –topic yqtopic1
Created topic “yqtopic1”.
root@ubuntu:/opt/kafka_2.11-1.1.0/bin#

root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ./kafka-topics.sh –describe –zookeeper 192.168.119.131:2181 –topic yqtopic1
Topic:yqtopic1 PartitionCount:4 ReplicationFactor:1 Configs:
Topic: yqtopic1 Partition: 0 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 1 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 2 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 3 Leader: 0 Replicas: 0 Isr: 0
root@ubuntu:/opt/kafka_2.11-1.1.0/bin#

2，修改刚创建的topic，并查看修改的情况
将分区数有4修改为12
root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ./kafka-topics.sh –alter –zookeeper 192.168.119.131:2181 –topic yqtopic1 –partitions 12
WARNING: If partitions are increased for a topic that has a key, the partition logic or ordering of the messages will be affected
Adding partitions succeeded!
root@ubuntu:/opt/kafka_2.11-1.1.0/bin#

root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ./kafka-topics.sh –describe –zookeeper 192.168.119.131:2181 –topic yqtopic1 Topic:yqtopic1 PartitionCount:12 ReplicationFactor:1 Configs:
Topic: yqtopic1 Partition: 0 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 1 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 2 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 3 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 4 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 5 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 6 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 7 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 8 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 9 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 10 Leader: 0 Replicas: 0 Isr: 0
Topic: yqtopic1 Partition: 11 Leader: 0 Replicas: 0 Isr: 0
root@ubuntu:/opt/kafka_2.11-1.1.0/bin# ls -al /tmp/kafka-logs/
total 72
drwxr-xr-x 14 root root 4096 Oct 13 14:34 .
drwxrwxrwt 17 root root 4096 Oct 13 14:34 …
-rw-r–r– 1 root root 0 Oct 13 14:10 cleaner-offset-checkpoint
-rw-r–r– 1 root root 0 Oct 13 14:10 .lock
-rw-r–r– 1 root root 4 Oct 13 14:33 log-start-offset-checkpoint
-rw-r–r– 1 root root 54 Oct 13 14:10 meta.properties
-rw-r–r– 1 root root 163 Oct 13 14:33 recovery-point-offset-checkpoint
-rw-r–r– 1 root root 163 Oct 13 14:34 replication-offset-checkpoint
drwxr-xr-x 2 root root 4096 Oct 13 14:20 yqtopic1-0
drwxr-xr-x 2 root root 4096 Oct 13 14:20 yqtopic1-1
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-10
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-11
drwxr-xr-x 2 root root 4096 Oct 13 14:20 yqtopic1-2
drwxr-xr-x 2 root root 4096 Oct 13 14:20 yqtopic1-3
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-4
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-5
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-6
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-7
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-8
drwxr-xr-x 2 root root 4096 Oct 13 14:33 yqtopic1-9
root@ubuntu:/opt/kafka_2.11-1.1.0/bin#

修改后的截图如下