Filealreadyexistsexception: output directory HDFS: // Ubuntu: 9000/output09 already exists

14/07/21 17:49:59 ERROR security.UserGroupInformation: PriviledgedActionException as:chenlongquan cause:org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory hdfs://ubuntu:9000/output09 already existsException in thread "main" org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory hdfs://ubuntu:9000/output09 already exists        at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:137)        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:973)        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936)        at java.security.AccessController.doPrivileged(Native Method)        at javax.security.auth.Subject.doAs(Subject.java:415)        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)        at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936)        at org.apache.hadoop.mapreduce.Job.submit(Job.java:550)        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580)        at com.pzoom.mapred.WordCount.main(WordCount.java:41)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:606)        at org.apache.hadoop.util.RunJar.main(RunJar.java:160)

This error generally means that the folder you want to upload already exists. In hadoop, you can only upload files once and cannot duplicate them. To continue uploading, solution: 1: delete an existing folder and 2: create a new folder.

Filealreadyexistsexception: output directory HDFS: // Ubuntu: 9000/output09 already exists