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  1. Pig
  2. PIG-894

order-by fails when input is empty

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.4.0
    • Fix Version/s: 0.6.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      grunt> l = load 'students.txt' ;
      grunt> f = filter l by 1 == 2;
      grunt> o = order f by $0 ;
      grunt> dump o;

      This results in 3 MR jobs . The 2nd (sampling) MR creates empty sample file, and 3rd MR (order-by) fails with following error in Map job -

      java.lang.RuntimeException: java.lang.RuntimeException: Empty samples file
      at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.WeightedRangePartitioner.configure(WeightedRangePartitioner.java:104)
      at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
      at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:82)
      at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.(MapTask.java:348)
      at org.apache.hadoop.mapred.MapTask.run(MapTask.java:193)
      at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
      Caused by: java.lang.RuntimeException: Empty samples file
      at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.WeightedRangePartitioner.configure(WeightedRangePartitioner.java:89)
      ... 5 more

        Attachments

        1. PIG-894-2.patch
          6 kB
          Daniel Dai
        2. PIG-894-1.patch
          5 kB
          Daniel Dai

          Activity

            People

            • Assignee:
              daijy Daniel Dai
              Reporter:
              thejas Thejas M Nair
            • Votes:
              1 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: