Error running query: MetaException(message:Got exception: java.net.ConnectException Call From XXXX

Error: Error running query: MetaException(message:Got exception: 
java.net.ConnectException Call From hadoop102/192.168.121.102 to hadoop102:9000 
failed on connection exception: 
java.net.ConnectException: 拒绝连接; 
For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused) (state=,code=0)

Hadoop集群没有启动

启动Hadoop集群：详细步骤