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java.net.ConnectException: Connection
 refused	at org.apache.hadoop.ipc.Client.wrapException(Client.java:845)	at org.apache.hadoop.ipc.Client.call(Client.java:821)	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:221)	at $Proxy0.getProtocolVersion(Unknown Source)	at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:363)