问题：
1. kafka的topic 是程序自己建立，默认只建立8个partitions，1个replication-factor
目的： 扩展partitions 到9个， replicatoion-factor 3个
原因：因为kafka是三台，如果replicatoion-factor设置1的话，kafka坏掉一个会有影响
(1). 扩展partitions 到9个
/kafka-topics.sh --zookeeper kafka-zookeeper01:2181,kafka-zookeeper02:2181,kafka-zookeeper03:2181/kafka --alter --topic Message --partitions 9
查看结果：
／kafka-topics.sh --describe --zookeeper kafka-zookeeper01:2181,kafka-zookeeper02:2181,kafka-zookeeper03:2181/kafka --topic Message
Topic:Message PartitionCount:9 ReplicationFactor:1 Configs:
Topic: Message Partition: 0 Leader: 1 Replicas: 1 Isr: 1
Topic:Message Partition: 1 Leader: 2 Replicas: 2 Isr: 2
Topic: Message Partition: 2 Leader: 3 Replicas: 3 Isr: 3
Topic: Message Partition: 3 Leader: 1 Replicas: 1 Isr: 1
Topic: Message Partition: 4 Leader: 2 Replicas: 2 Isr: 2
Topic: Message Partition: 5 Leader: 3 Replicas: 3 Isr: 3
Topic: Message Partition: 6 Leader: 1 Replicas: 1 Isr: 1
Topic: Message Partition: 7 Leader: 2 Replicas: 2 Isr: 2
Topic: Message Partition: 8 Leader: 3 Replicas: 3 Isr: 3
（2）扩展ReplicationFactor 为3
vim increace-factor.json
{"version":1,
"partitions":[
{"topic":"Message","partition":0,"replicas":[1,2,3]},
{"topic":"Message","partition":1,"replicas":[1,2,3]},
{"topic":"Message","partition":2,"replicas":[1,2,3]},
{"topic":"Message","partition":3,"replicas":[1,2,3]},
{"topic":"Message","partition":4,"replicas":[1,2,3]},
{"topic":"Message","partition":5,"replicas":[1,2,3]},
{"topic":"Message","partition":6,"replicas":[1,2,3]},
{"topic":"Message","partition":7,"replicas":[1,2,3]}
{"topic":"Message","partition":8,"replicas":[1,2,3]}
]}
执行如下命令：
/kafka-reassign-partitions.sh --zookeeper kafka-zookeeper01:2181,kafka-zookeeper02:2181,kafka-zookeeper03:2181/kafka --reassignment-json-file increace-factor.json --execute
[[email protected]]#/kafka-topics.sh --describe --zookeeper kafka-zookeeper01:2181,kafka-zookeeper02:2181,kafka-zookeeper03:2181/kafka --topic Message
Topic:Message PartitionCount:9 ReplicationFactor:3 Configs:
Topic: Message Partition: 0 Leader: 1 Replicas: 1,2,3 Isr: 1,2,3
Topic: Message Partition: 1 Leader: 1 Replicas: 1,2,3 Isr: 2,1,3
Topic: Message Partition: 2 Leader: 1 Replicas: 1,2,3 Isr: 3,1,2
Topic: Message Partition: 3 Leader: 1 Replicas: 1,2,3 Isr: 1,2,3
Topic: Message Partition: 4 Leader: 1 Replicas: 1,2,3 Isr: 2,1,3
Topic: Message Partition: 5 Leader: 1 Replicas: 1,2,3 Isr: 3,1,2
Topic: Message Partition: 6 Leader: 1 Replicas: 1,2,3 Isr: 1,2,3
Topic: cMessage Partition: 7 Leader: 1 Replicas: 1,2,3 Isr: 2,1,3
Topic: Message Partition: 8 Leader: 1 Replicas: 1,2,3 Isr: 2,1,3
原文地址：https://www.cnblogs.com/wangyh702/p/11477347.html