java.lang.IllegalArgumentException: java.net.UnknownHostException: quickstart.cloudera

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java.net.UnknownHostException: hadoopcluster
java.lang.IllegalArgumentException: java.net.UnknownHostException: quickstart.cloudera
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:240)
at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:144)
at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:579)
at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:524)
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.singleThreadedListStatus(FileInputFormat.java:256)
at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:228)
at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:207)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:237)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:35)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:239)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.sql.execution.SparkPlan.executeTake(SparkPlan.scala:193)
at org.apache.spark.sql.execution.Limit.executeCollect(basicOperators.scala:207)
at org.apache.spark.sql.DataFrame$$anonfun$collect$1.apply(DataFrame.scala:1386)
at org.apache.spark.sql.DataFrame$$anonfun$collect$1.apply(DataFrame.scala:1386)
at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:56)
at org.apache.spark.sql.DataFrame.withNewExecutionId(DataFrame.scala:1904)
at org.apache.spark.sql.DataFrame.collect(DataFrame.scala:1385)
at org.apache.spark.sql.DataFrame.head(DataFrame.scala:1315)
at org.apache.spark.sql.DataFrame.take(DataFrame.scala:1378)
at org.apache.spark.sql.DataFrame.showString(DataFrame.scala:178)
at org.apache.spark.sql.DataFrame.show(DataFrame.scala:402)
at org.apache.spark.sql.DataFrame.show(DataFrame.scala:363)
at org.apache.spark.sql.DataFrame.show(DataFrame.scala:371)
at undefined.$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:20)
at undefined.$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:25)
at undefined.$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:27)
at undefined.$iwC$$iwC$$iwC$$iwC$$iwC.(:29)
at undefined.$iwC$$iwC$$iwC$$iwC.(:31)
at undefined.$iwC$$iwC$$iwC.(:33)
at undefined.$iwC$$iwC.(:35)

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