zookeeper删除kafka元数据，解决kafka无法消费数据的问题

由于启动Kafka前未启动Zookeeper，消费者无法获取数据。通过Zookeeper客户端删除/brokers/topic目录下所有内容，清空之前创建的topic，重启服务即可解决问题。

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启动kafka前没有启动zookeeper，导致消费者消费不到数据

解决方法：启动zookeeper的客户工具，删除zookeeper根目录下的brokers目录下的topic目录下的所有东西（这样会把之前建的所有topic都删除）

具体步骤：

1、启动zookeeper 客户端：进到zookeeper的安装目录

[root@Node1 bin]# cd /usr/apps/zookeeper/bin/

[root@Node1 bin]# ls
README.txt  zkCleanup.sh  zkCli.cmd  zkCli.sh  zkEnv.cmd  zkEnv.sh  zkServer.cmd  zkServer.sh  zookeeper.out

2、运行zkCli.sh

[root@Node1 bin]# ./zkCli.sh 
Connecting to localhost:2181
2017-11-09 22:57:00,437 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
2017-11-09 22:57:00,453 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=Node1
2017-11-09 22:57:00,454 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0_79
2017-11-09 22:57:00,454 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2017-11-09 22:57:00,458 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.7/jre
2017-11-09 22:57:00,461 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/apps/zookeeper/bin/../build/classes:/usr/apps/zookeeper/bin/../build/lib/*.jar:/usr/apps/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/apps/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/apps/zookeeper/bin/../lib/netty-3.2.2.Final.jar:/usr/apps/zookeeper/bin/../lib/log4j-1.2.15.jar:/usr/apps/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/apps/zookeeper/bin/../zookeeper-3.4.5.jar:/usr/apps/zookeeper/bin/../src/java/lib/*.jar:/usr/apps/zookeeper/bin/../conf:.::/usr/java/jdk1.7/lib:/usr/java/jdk1.7/jre/lib
2017-11-09 22:57:00,462 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2017-11-09 22:57:00,463 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2017-11-09 22:57:00,463 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2017-11-09 22:57:00,468 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2017-11-09 22:57:00,469 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2017-11-09 22:57:00,470 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=2.6.32-573.el6.x86_64
2017-11-09 22:57:00,470 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2017-11-09 22:57:00,471 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2017-11-09 22:57:00,471 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/usr/apps/zookeeper/bin
2017-11-09 22:57:00,477 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@5409396f
Welcome to ZooKeeper!
2017-11-09 22:57:00,533 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@966] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2017-11-09 22:57:00,550 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@849] - Socket connection established to localhost/127.0.0.1:2181, initiating session
JLine support is enabled
2017-11-09 22:57:00,565 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x15fa12e114e0004, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]

3、查看/brokers/topic下面有什么东西

[zk: localhost:2181(CONNECTED) 0] ls /brokers/topics

4、删除里面所有的文件

[zk: localhost:2181(CONNECTED) 0]rmr /brokers/topics/hive-test-table