java.lang.IllegalArgumentException: java.net.UnknownHostException: user

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java.net.UnknownHostException: Cluster
java.lang.IllegalArgumentException: java.net.UnknownHostException: user
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.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.mapred.FileInputFormat.listStatus(FileInputFormat.java:221)
at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:140)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)
at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)
at 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$$anonfun$partitions$2.apply(RDD.scala:207)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)
at org.apache.spark.rdd.MappedRDD.getPartitions(MappedRDD.scala:28)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:207)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:205)
at org.apache.spark.Partitioner$.defaultPartitioner(Partitioner.scala:58)
at undefined.$iwC$$iwC$$iwC$$iwC.(:14)
at undefined.$iwC$$iwC$$iwC.(:19)
at undefined.$iwC$$iwC.(:21)

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