org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory file:/home/hp/output already exists

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    Root Cause Analysis

    1. org.apache.hadoop.mapred.FileAlreadyExistsException

      Output directory file:/home/hp/output already exists

      at org.apache.hadoop.mapred.FileOutputFormat.checkOutputSpecs()
    2. Hadoop
      Job$10.run
      1. org.apache.hadoop.mapred.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:132)
      2. org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:564)
      3. org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:432)
      4. org.apache.hadoop.mapreduce.Job$10.run(Job.java:1296)
      5. org.apache.hadoop.mapreduce.Job$10.run(Job.java:1293)
      5 frames
    3. Java RT
      Subject.doAs
      1. java.security.AccessController.doPrivileged(Native Method)
      2. javax.security.auth.Subject.doAs(Subject.java:415)
      2 frames
    4. Hadoop
      UserGroupInformation.doAs
      1. org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
      1 frame
    5. Hadoop
      JobClient$1.run
      1. org.apache.hadoop.mapreduce.Job.submit(Job.java:1293)
      2. org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:562)
      3. org.apache.hadoop.mapred.JobClient$1.run(JobClient.java:557)
      3 frames
    6. Java RT
      Subject.doAs
      1. java.security.AccessController.doPrivileged(Native Method)
      2. javax.security.auth.Subject.doAs(Subject.java:415)
      2 frames
    7. Hadoop
      UserGroupInformation.doAs
      1. org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
      1 frame
    8. Hadoop
      JobClient.runJob
      1. org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:557)
      2. org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:548)
      3. org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:833)
      3 frames
    9. WordCount
      WordCount.run
      1. WordCount.WordCount.run(WordCount.java:31)
      1 frame
    10. Hadoop
      ToolRunner.run
      1. org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
      1 frame
    11. WordCount
      WordCount.main
      1. WordCount.WordCount.main(WordCount.java:37)
      1 frame