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when i try to execute the command bin/start-dfs.sh  , i get the following
error . I have checked the hadoop-site.xml file on all the nodes , and they
are fine ..
can some-one help me out! Exception in thread "main" java.net.UnknownHostException:
unknown host:     at
org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:195)     at
org.apache.hadoop.ipc.Client.getConnection(Client.java:779)     at org.apache.hadoop.ipc.Client.call(Client.java:704)     at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)     at org.apache.hadoop.dfs.$Proxy4.getProtocolVersion(Unknown
Source)     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:319)     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:306)     at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:343)     at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:288)