Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-838

Task succeeds even when committer.commitTask fails with IOException

    Details

    • Type: Bug Bug
    • Status: Resolved
    • Priority: Blocker Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.20.1
    • Fix Version/s: 0.20.1
    • Component/s: task
    • Labels:
      None
    • Release Note:
      Fixed a bug in the way commit of task outputs happens. The bug was that if commit fails with IOException, the task would be declared as successful.

      Description

      In MAPREDUCE-837, job succeeded with empty output even though all the tasks were throwing IOException at commiter.commitTask.

      2009-08-07 17:51:47,458 INFO org.apache.hadoop.mapred.TaskRunner: Task attempt_200907301448_8771_r_000000_0 is allowed to commit now
      2009-08-07 17:51:47,466 WARN org.apache.hadoop.mapred.TaskRunner: Failure committing: java.io.IOException: Can not get the relative path: \
      base = hdfs://mynamenode:8020/user/knoguchi/test2.har/_temporary/_attempt_200907301448_8771_r_000000_0 \
      child = hdfs://mynamenode/user/knoguchi/test2.har/_temporary/_attempt_200907301448_8771_r_000000_0/_index
        at org.apache.hadoop.mapred.FileOutputCommitter.getFinalPath(FileOutputCommitter.java:150)
        at org.apache.hadoop.mapred.FileOutputCommitter.moveTaskOutputs(FileOutputCommitter.java:106)
        at org.apache.hadoop.mapred.FileOutputCommitter.moveTaskOutputs(FileOutputCommitter.java:126)
        at org.apache.hadoop.mapred.FileOutputCommitter.commitTask(FileOutputCommitter.java:86)
        at org.apache.hadoop.mapred.OutputCommitter.commitTask(OutputCommitter.java:171)
        at org.apache.hadoop.mapred.Task.commit(Task.java:768)
        at org.apache.hadoop.mapred.Task.done(Task.java:692)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
        at org.apache.hadoop.mapred.Child.main(Child.java:170)
      
      2009-08-07 17:51:47,468 WARN org.apache.hadoop.mapred.TaskRunner: Failure asking whether task can commit: java.io.IOException: \
      Can not get the relative path: base = hdfs://mynamenode:8020/user/knoguchi/test2.har/_temporary/_attempt_200907301448_8771_r_000000_0 \
      child = hdfs://mynamenode/user/knoguchi/test2.har/_temporary/_attempt_200907301448_8771_r_000000_0/_index
        at org.apache.hadoop.mapred.FileOutputCommitter.getFinalPath(FileOutputCommitter.java:150)
        at org.apache.hadoop.mapred.FileOutputCommitter.moveTaskOutputs(FileOutputCommitter.java:106)
        at org.apache.hadoop.mapred.FileOutputCommitter.moveTaskOutputs(FileOutputCommitter.java:126)
        at org.apache.hadoop.mapred.FileOutputCommitter.commitTask(FileOutputCommitter.java:86)
        at org.apache.hadoop.mapred.OutputCommitter.commitTask(OutputCommitter.java:171)
        at org.apache.hadoop.mapred.Task.commit(Task.java:768)
        at org.apache.hadoop.mapred.Task.done(Task.java:692)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
        at org.apache.hadoop.mapred.Child.main(Child.java:170)
      
      2009-08-07 17:51:47,469 INFO org.apache.hadoop.mapred.TaskRunner: Task attempt_200907301448_8771_r_000000_0 is allowed to commit now
      2009-08-07 17:51:47,472 INFO org.apache.hadoop.mapred.TaskRunner: Task 'attempt_200907301448_8771_r_000000_0' done.
      
      
      
      1. patch-838.txt
        5 kB
        Amareshwari Sriramadasu
      2. patch-838-0.20.txt
        5 kB
        Amareshwari Sriramadasu
      3. patch-838-1.txt
        4 kB
        Amareshwari Sriramadasu
      4. patch-838-1-0.20.txt
        4 kB
        Amareshwari Sriramadasu

        Activity

          People

          • Assignee:
            Amareshwari Sriramadasu
            Reporter:
            Koji Noguchi
          • Votes:
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            Watchers:
            4 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development