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java.lang.NullPointerException at java.lang.ProcessBuilder.start( at org.apache.hadoop.util.Shell.runCommand( at at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute( at org.apache.hadoop.util.Shell.execCommand( at org.apache.hadoop.util.Shell.execCommand( at org.apache.hadoop.fs.RawLocalFileSystem.setPermission( at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode( at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission( at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs( at org.apache.hadoop.fs.FilterFileSystem.mkdirs( at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir( at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal( at org.apache.hadoop.mapreduce.Job$ at org.apache.hadoop.mapreduce.Job$ at Method) at at at org.apache.hadoop.mapreduce.Job.submit( at org.apache.hadoop.mapreduce.Job.waitForCompletion( at at at at MapReduce.HadMapReduce.RecCount.main(