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java.net.UnknownHostException: nameservice1	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:448)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:410)	at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:128)	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2308)	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:87)	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2342)	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2324)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:351)	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:194)	at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:103)	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:980)	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:974)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:416)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438)	at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:974)	at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:948)	at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1410)	at org.apache.hadoop.examples.SleepJob.run(SleepJob.java:174)	at org.apache.hadoop.examples.SleepJob.run(SleepJob.java:237)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at org.apache.hadoop.examples.SleepJob.main(SleepJob.java:165)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:622)	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)	at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:144)	at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:622)	at org.apache.hadoop.util.RunJar.main(RunJar.java:208)