没有HDFS 和mapreduCe 是不是要先搭一个？

localhost: starting secondarynamenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-secondarynamenode-wangxue-dfv-test-no-del.novalocal.out

localhost: Exception in thread "main" java.net.UnknownHostException: unknown host: imooc

localhost:      at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:236)

localhost:      at org.apache.hadoop.ipc.Client.getConnection(Client.java:1239)

localhost:      at org.apache.hadoop.ipc.Client.call(Client.java:1093)

localhost:      at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)

localhost:      at com.sun.proxy.$Proxy5.getProtocolVersion(Unknown Source)

localhost:      at org.apache.hadoop.ipc.RPC.checkVersion(RPC.java:422)

localhost:      at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:414)

localhost:      at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:392)