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java.lang.IllegalArgumentException: java.net.UnknownHostException: user	at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:377)	at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:237)	at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:141)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:576)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:521)	at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:146)	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2397)	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431)	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)	at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:221)	at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:270)	at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:140)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:205)	at scala.Option.getOrElse(Option.scala:120)	at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)	at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:205)	at scala.Option.getOrElse(Option.scala:120)	at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)	at org.apache.spark.rdd.FlatMappedRDD.getPartitions(FlatMappedRDD.scala:30)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:205)	at scala.Option.getOrElse(Option.scala:120)	at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)	at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:205)	at scala.Option.getOrElse(Option.scala:120)	at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)	at org.apache.spark.Partitioner$.defaultPartitioner(Partitioner.scala:58)	at org.apache.spark.rdd.PairRDDFunctions.reduceByKey(PairRDDFunctions.scala:355)	at $iwC$$iwC$$iwC$$iwC.(:14)	at $iwC$$iwC$$iwC.(:19)	at $iwC$$iwC.(:21)	at $iwC.(:23)