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java.net.UnknownHostException: user	at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:414)	at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:164)	at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:129)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:389)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:356)	at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:124)	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2218)	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:80)	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2252)	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2234)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:300)	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:194)	at org.apache.hadoop.util.GenericOptionsParser.validateFiles(GenericOptionsParser.java:397)	at org.apache.hadoop.util.GenericOptionsParser.processGeneralOptions(GenericOptionsParser.java:294)	at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:422)	at org.apache.hadoop.util.GenericOptionsParser.(GenericOptionsParser.java:168)	at org.apache.hadoop.util.GenericOptionsParser.(GenericOptionsParser.java:151)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:64)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)	at org.apache.hadoop.streaming.HadoopStreaming.main(HadoopStreaming.java:50)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.hadoop.util.RunJar.main(RunJar.java:208)