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  1. Hadoop Common
  2. HADOOP-645

Map-reduce task does not finish correctly when -reducer NONE is specified

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.7.2
    • Fix Version/s: 0.9.0
    • Component/s: None
    • Labels:
      None

      Description

      Map-reduce task does not finish correctly when -reducer NONE is specified, The NONE option means that the reducer should not be generating any output. Using this option causes an exception in the task tracker:

      java.lang.IllegalArgumentException: URI is not hierarchical
      TaskRunner: at java.io.File.<init>(File.java:335)
      TaskRunner: at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:583)
      TaskRunner: at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:96)
      TaskRunner: at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:49)
      TaskRunner: at org.apache.hadoop.mapred.MapTask.run(MapTask.java:213)
      TaskRunner: at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1240)
      TaskRunner: sideEffectURI_ file:output length 11

        Attachments

        1. reducernone.patch
          1 kB
          dhruba borthakur

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              • Assignee:
                dhruba dhruba borthakur
                Reporter:
                dhruba dhruba borthakur
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                • Created:
                  Updated:
                  Resolved: