怎么彻底删除kafka的topic，然后重建？

**kafka 0.8.1.1以及之前版本**都无法使用类似一条命令就彻底删除topic，此命令不过只是在zookeeper注销信息而已，但是实际的日志内容还是保存在kafka log中，如果想彻底删除topic，过程如下：
1、从zookeerer删除信息
./bin/kafka-run-class.sh kafka.admin.DeleteTopicCommand --zookeeper 10.0.1.10:2181,10.0.1.11:2181,10.0.1.12:2181 --topic test成功后返回信息：deletion succeeded!
2、利用JPS命令查看kafka和zookeeper进程，kill掉QuorumPeerMain和Kafka进程
3、从kafka的log.dirs目录删除文件，可以看到多个子目录名字如test-0,test-1…test-n（就是你topic的partition个数）
进入到kafka的log.dirs目录，执行
rm –fr test-0……test-n(4)  修改日志目录的recovery-point-offset-checkpoint和replication-offset-checkpoint文件（要小心删除，否则待会kafka不能正常启动起来）
replication-offset-checkpoint格式如下：
0
4(partition总数)
test 0 0
test 3 0
hehe 0 0
hehe 1 0
修改后如下：
0
2(partition总数)
hehe 0 0
hehe 1 0
把含有test行全部去掉，并且把partition总数修改为减去test的partition的剩余数目，同理recovery-point-offset-checkpoint也是这样修改。
完成后就可以正常启动zookeeper和kafka。**从kafka 0.8.2.1**开始可以直接删除topic，步骤如下：
kafka 0.8.1.1之前版本，kafka-topics.sh命令连--delete                                Delete a topic参数都没有，如下：
# ./kafka-topics.sh --help
Command must include exactly one action: --list, --describe, --create or --alter
Option Description
------ -----------
--alter Alter the configuration for the topic.
--config A topic configuration override for the
topic being created or altered.
--create Create a new topic.
--deleteConfig A topic configuration override to be
removed for an existing topic
--describe List details for the given topics.
--help Print usage information.
--list List all available topics.
--partitions The number of partitions for the topic
being created or altered (WARNING:
If partitions are increased for a
topic that has a key, the partition
logic or ordering of the messages
will be affected
--replica-assignment A list of manual partition-to-broker
broker_id_for_part1_replica2 , created or altered.
broker_id_for_part2_replica1 :
broker_id_for_part2_replica2 , ...>
--replication-factor replication factor> partition in the topic being created.
--topic The topic to be create, alter or
describe. Can also accept a regular
expression except for --create option
--topics-with-overrides if set when describing topics, only
show topics that have overridden
configs
--unavailable-partitions if set when describing topics, only
show partitions whose leader is not
available
--under-replicated-partitions if set when describing topics, only
show under replicated partitions
--zookeeper REQUIRED: The connection string for
the zookeeper connection in the form
host:port. Multiple URLS can be
given to allow fail-over.
# **而kafka 0.8.2.1**新增加了这个参数
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删除过程：
1、在kafka配置文件中添加删除参数
delete.topic.enable=true2、利用命令删除需要删除的topic
bin/kafka-topics.sh --zookeeper zk_host:port/chroot --delete --topic my_topic_namehttp://kafka.apache.org/documentation.html#gettingStarted如下：
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1、设置配置文件允许删除

delete.topic.enable=true 配置添加到 config/server.properties

2、执行删除命令

./bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic test-topic

在zookeeper中确认：

 删除zookeeper下/brokers/topics/test-topic节点
 删除zookeeper下/config/topics/test-topic节点
 删除zookeeper下/admin/delete_topics/test-topic节点
 
consumer 的话 删除groupid
 
 
删除逻辑参考：http://www.cnblogs.com/huxi2b/p/4842695.html 

版本不一样，删除方法不一样，最好是升级到新版较稳定的比较好。