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java.net.UnknownHostException: unknown host:
 local	at org.apache.hadoop.ipc.Client$Connection.(Client.java:195)	at org.apache.hadoop.ipc.Client.getConnection(Client.java:850)	at org.apache.hadoop.ipc.Client.call(Client.java:720)	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)	at $Proxy4.getProtocolVersion(Unknown Source)	at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:359)	at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:346)	at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:383)	at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:314)	at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:291)	at org.apache.hama.bsp.GroomServer.initialize(GroomServer.java:279)	at org.apache.hama.bsp.GroomServer.run(GroomServer.java:600)	at java.lang.Thread.run(Thread.java:680)