sh kafka-topics.sh --describe --zookeeper datanode02.yixia.com:2181 datanode03.yixia.com:2181 datanode01.yixia.com:2181 namenode01.yixia.com:2181 namenode02.yixia.com:2181 --topic test

Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 9999; nested exception is:

java.net.BindException: Address already in use (Bind failed)