UserPrivilegedException, while creating a directory in HDFS as a specific user, through JAVA - apache

Question

I a'm using CDH 4.7. I am trying to create a folder in HDFS in /user/cloudera. But the UserPrivilegedException is thrown. Below is my code (#copied)
public static void main(String args[]) {
try {
UserGroupInformation ugi =
UserGroupInformation.createProxyUser("cloudera", UserGroupInformation.getLoginUser());
System.out.println(ugi.getUserName());
ugi.doAs(new PrivilegedExceptionAction<Void>() {
public Void run() throws Exception {
System.out.println("aaa");
Configuration conf = new Configuration();
conf.set("fs.defaultFS", "hdfs://localhost.localdomain:8020/user/cloudera");
conf.set("hadoop.job.ugi", "cloudera");
FileSystem fs = FileSystem.get(conf);
fs.createNewFile(new Path("/user/cloudera/test"));
Path path = new Path("/user/cloudera/Hbasesyntax.txt");
FileStatus[] status = fs.listStatus(path);
for(int i=0;i<status.length;i++){
System.out.println(status[i].getPath());
}
return null;
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
Then, I even tried accessing the file (Hbasesyntax.txt) which I -put through the terminal. But, not able to get the file information from that too. Am I missing anything.
Below is the exception thrown:
Feb 23, 2015 1:18:27 AM org.apache.hadoop.security.UserGroupInformation doAs
SEVERE: **PriviledgedActionException as:cloudera via cloudera cause:java.io.IOException: Mkdirs failed to create /user/cloudera
java.io.IOException: Mkdirs failed to create /user/cloudera
at** org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:378)
at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:364)
at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:564)
at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:545)
at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:507)
at org.apache.hadoop.fs.FileSystem.createNewFile(FileSystem.java:647)
at HDFSFileOperations.GetIntoFS$1.run(GetIntoFS.java:32)
at HDFSFileOperations.GetIntoFS$1.run(GetIntoFS.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1 190)
at HDFSFileOperations.GetIntoFS.main(GetIntoFS.java:21)