工作中因为各种原因， 例如topic中消息堆积的太多，或者kafka所在磁盘空间满了等等，可能需要彻底清理一下kafka topic，那么如何彻底删除topic？
方法一（配置delete.topic.enable=true）
  修改kafaka配置文件server.properties， 添加delete.topic.enable=true，重启kafka，之后通过kafka命令行就可以直接删除topic
  通过命令行删除topic：

    ./bin/kafka-topics.sh --delete --zookeeper {zookeeper server} --topic {topic name}

方法二（没有配置delete.topic.enable=true）

1、通过命令行删除topic：

./bin/kafka-topics.sh --delete --zookeeper {zookeeper server} --topic {topic name}

  因为kafaka配置文件中server.properties没有配置delete.topic.enable=true，此时的删除并不是真正的删除，只是把topic标记为：marked for deletion
  你可以通过命令：./bin/kafka-topics --zookeeper {zookeeper server} --list 来查看所有topic
2、删除kafka存储目录（server.properties文件log.dirs配置，默认为"/tmp/kafka-logs"）相关topic目录

3， 若想真正删除它，需要登录zookeeper客户端：

  命令：./bin/zkCli.sh

  找到topic所在的目录：ls /brokers/topics

   执行命令：rmr /brokers/topics/{topic name}即可，此时topic被彻底删除。

  另外被标记为marked for deletion的topic你可以在zookeeper客户端中通过命令获得：ls /admin/delete_topics/{topic name}，如果你删除了此处的topic，那么marked for deletion 标记消失

zookeeper 的config中也有有关topic的信息： ls /config/topics/{topic name}暂时不知道有什么用

总结

彻底删除topic：
1、确保kafka的配置文件server.proeprties中设置delete.topic.enable=true，如果没有， 确保cluster的所有kafka配置文件设置该参数并重启，然后直接通过命令删除，如果命令删除不了，直接通过zookeeper命令行删除掉broker下的topic。

2、删除kafka存储目录（server.properties文件log.dirs配置，默认为"/tmp/kafka-logs"）相关topic目录

参考文档：
1， https://stackoverflow.com/questions/17730905/is-there-a-way-to-delete-all-the-data-from-a-topic-or-delete-the-topic-before-ev

1. stop zookeeper & Kafka server,
2. then go to ‘kafka-logs’ folder , there you will see list of kafka topic folders, delete folder with topic name
3. go to ‘zookeeper-data’ folder , delete data inside that.
4. start zookeeper & kafka server again.

2， https://cwiki.apache.org/confluence/display/KAFKA/FAQ#FAQ-Isitpossibletodeleteatopic?
Deleting a topic is supported since 0.8.2.x. You will need to enable topic deletion (setting delete.topic.enable to true) on all brokers first.

3， https://cwiki.apache.org/confluence/display/KAFKA/KIP-162+-+Enable+topic+deletion+by+default

4， https://github.com/darrenfu/bigdata/issues/6

*** The only way to delete a topic permanently is as follows: ***

stop the brokers
sudo supervisorctl stop kafka-broker
remove the directories on disk
sudo rm -rf <kafka_data_dir>/<topic_name>*
remove the topic from zookeeper:
bin/zkCli.sh

rmr /config/topics/<topic_name>
rmr /brokers/topics/<topic_name>
rmr /admin/delete_topics/<topic_name>

verify the topic directory is deleted in zookeeper:

ls

start the brokers back up
sudo supervisorctl start kafka-broker
re-create the kafka topic if needed