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  1. Hive
  2. HIVE-7292 Hive on Spark
  3. HIVE-7731

Incorrect result returned when a map work has multiple downstream reduce works [Spark Branch]

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    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.1.0
    • Component/s: Spark
    • Labels:
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      Description

      Encountered when running on spark. Suppose we have three tables:

      table1(x int, y int);
      table2(x int);
      table3(x int);
      

      I run the following query:

      from table1
      insert overwrite table table2 select x group by x
      insert overwrite table table3 select y group by y;
      

      The query generates 1 map and 2 reduces. The map operator has 2 RS, so I suppose it has output for both reduces.
      The problem is all (incorrect) results go to table2 and table3 is empty.

      I tried the same query on MR and it gives correct results.

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              • Assignee:
                csun Chao Sun
                Reporter:
                lirui Rui Li
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                • Created:
                  Updated:
                  Resolved: