問題：卸載kafka前未刪除kafka topic,重新安裝kafka后，生成跟之前topic名字相同的topic時報錯，顯示topic已存在

[root@d96 ~]# kafka-topics --zookeeper d65:2181/kafka_hive --create  --topic hive-test-table --partitions 5 --replication-factor 2
WARNING: Due to limitations in metric names, topics with a period ('.') or underscore ('_') could collide. To avoid issues it is best to use either, but not both.
Error while executing topic command : Topic "hive-test-table" already exists.
[2017-01-16 10:48:30,766] ERROR kafka.common.TopicExistsException: Topic "hive-test-table" already exists.
    at kafka.admin.AdminUtils$.createOrUpdateTopicPartitionAssignmentPathInZK(AdminUtils.scala:261)
    at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:245)
    at kafka.admin.TopicCommand$.createTopic(TopicCommand.scala:107)
    at kafka.admin.TopicCommand$.main(TopicCommand.scala:60)
    at kafka.admin.TopicCommand.main(TopicCommand.scala)
 (kafka.admin.TopicCommand$)

原因：kafka topic的元數據存儲在zookeeper里，卸載kafka前未刪除topic,之前topic的元數據仍存在zk里，需要手動刪除zk里的元數據

解決：

zookeeper shell命令

[zk: d65:2181/kafka_hive(CONNECTED) 7] ll
ZooKeeper -server host:port cmd args
    connect host:port
    get path [watch]
    ls path [watch]
    set path data [version]
    rmr path
    delquota [-n|-b] path
    quit 
    printwatches on|off
    create [-s] [-e] path data acl
    stat path [watch]
    close 
    ls2 path [watch]
    history 
    listquota path
    setAcl path acl
    getAcl path
    sync path
    redo cmdno
    addauth scheme auth
    delete path [version]
    setquota -n|-b val path

進入zookeeper目錄，刪除kafka topic 元數據

[root@d100 bin]# sh zkCli.sh -server  d65:2181/kafka_hive

[zk: d65:2181/kafka_hive(CONNECTED) 8] ls /
[consumers, config, controller, isr_change_notification, brokers, admin, controller_epoch]

[zk: d65:2181/kafka_hive(CONNECTED) 9] ls /brokers
[seqid, topics, ids]

[zk: d65:2181/kafka_hive(CONNECTED) 10] ls /brokers/topics
[略...]

[zk: d65:2181/kafka_hive(CONNECTED) 11] rmr /brokers/topics/hive-test-table

[zk: d65:2181/kafka_hive(CONNECTED) 13] ls /brokers/topics
[略...]

重新創建topic成功

[root@d96 ~]# kafka-topics --zookeeper d65:2181/kafka_hive --create  --topic hive-test-table --partitions 5 --replication-factor 2
Created topic "hive-test-table".

[root@d96 ~]# kafka-topics --zookeeper d65:2181/kafka_hive --desc  --topic hive-test-table
Topic:hive-test-table   PartitionCount:5    ReplicationFactor:2 Configs:
    Topic: hive-test-table  Partition: 0    Leader: 1285    Replicas: 1285,1281 Isr: 1285,1281
    Topic: hive-test-table  Partition: 1    Leader: 1281    Replicas: 1281,1282 Isr: 1281,1282
    Topic: hive-test-table  Partition: 2    Leader: 1282    Replicas: 1282,1283 Isr: 1282,1283
    Topic: hive-test-table  Partition: 3    Leader: 1283    Replicas: 1283,1284 Isr: 1283,1284
    Topic: hive-test-table  Partition: 4    Leader: 1284    Replicas: 1284,1285 Isr: 1284,1285