kafka 创建topic时出现如下异常:

Error while executing topic command org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /brokers/ids
org.I0Itec.zkclient.exception.ZkNoNodeException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /brokers/ids
 at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47)
 at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:685)
 at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:413)
 at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:409)
 at kafka.utils.ZkUtils$.getChildren(ZkUtils.scala:462)
 at kafka.utils.ZkUtils$.getSortedBrokerList(ZkUtils.scala:78)
 at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:170)
 at kafka.admin.TopicCommand$.createTopic(TopicCommand.scala:93)
 at kafka.admin.TopicCommand$.main(TopicCommand.scala:55)
 at kafka.admin.TopicCommand.main(TopicCommand.scala)
Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /brokers/ids
 at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
 at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
 at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
 at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
 at org.I0Itec.zkclient.ZkConnection.getChildren(ZkConnection.java:99)
 at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:416)
 at org.I0Itec.zkclient.ZkClient$2.call(ZkClient.java:413)
 at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
 ... 8 more


在之前的版本中一直没有这样问题，当kafka安装成功时通过集群查看一切都是正常的，但是创建topic确始终提示找不到节点，一开始是用如下命令创建的，这是照 前文档和其它资料做的：

 kafka-topics.sh --create --topic firsttopic --replication-factor 2 --partitions 2 --zookeeper slave1:2181       用这个命令始报上述异常。最后试着把他zookeeper集群全路径写上，结果就成功创建了，用如下命令： 

kafka-topics.sh --create --topic firsttopic --replication-factor 2 --partitions 2 --zookeeper slave1:2181/kafka