一、修改partitions(只能新增)
[root@hftest0001 kafka_2.11-0.8.2.2]# pwd
/opt/kafka_2.11-0.8.2.2
[root@hftest0001 kafka_2.11-0.8.2.2]# ./bin/kafka-topics.sh --zookeeper ${ip}:${port} --replication-factor 2 --partitions 1 --topic topic_r2_p1 --create
Created topic "topic_r2_p1".
[root@hftest0001 kafka_2.11-0.8.2.2]# ./bin/kafka-topics.sh --zookeeper ${ip}:${port} --topic topic_r2_p1 --describe
Topic:topic_r2_p1 PartitionCount:1 ReplicationFactor:2 Configs:
Topic: topic_r2_p1 Partition: 0 Leader: 201 Replicas: 201,155 Isr: 201,155
[root@hftest0003 kafka_2.11-0.8.2.2]# ./bin/kafka-topics.sh --zookeeper ${ip}:${port} --alter --partitions 2 --topic topic_r2_p1
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@hftest0003 kafka_2.11-0.8.2.2]# ./bin/kafka-topics.sh --zookeeper 10.224.246.201:2181,10.224.246.155:2181,10.224.246.154:2181 --describe topic_r2_p1
Topic:topic_r2_p1 PartitionCount:2 ReplicationFactor:2 Configs:
Topic: topic_r2_p1 Partition: 0 Leader: 201 Replicas: 201,155 Isr: 201,155
Topic: topic_r2_p1 Partition: 1 Leader: 155 Replicas: 155,154 Isr: 155,154
[root@hftest0003 kafka_2.11-0.8.2.2]# ./bin/kafka-topics.sh --zookeeper 10.224.246.201:2181,10.224.246.155:2181,10.224.246.154:2181 --alter --partitions 1 --topic topic_r2_p1
WARNING: If partitions are increased for a topic that has a key, the partition logic or ordering of the messages will be affected
Error while executing topic command The number of partitions for a topic can only be increased
kafka.admin.AdminOperationException: The number of partitions for a topic can only be increased
at kafka.admin.AdminUtils$.addPartitions(AdminUtils.scala:114)
at kafka.admin.TopicCommand$$anonfun$alterTopic$1.apply(TopicCommand.scala:119)
at kafka.admin.TopicCommand$$anonfun$alterTopic$1.apply(TopicCommand.scala:100)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at kafka.admin.TopicCommand$.alterTopic(TopicCommand.scala:100)
at kafka.admin.TopicCommand$.main(TopicCommand.scala:57)
at kafka.admin.TopicCommand.main(TopicCommand.scala)二、
来源：oschina
链接：https://my.oschina.net/u/204498/blog/614931