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Posted to issues@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2014/02/24 10:43:19 UTC

[jira] [Created] (TAJO-628) The second stage of distinct aggregation can be scheduled to only one node.

Hyunsik Choi created TAJO-628:
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             Summary: The second stage of distinct aggregation can be scheduled to only one node.
                 Key: TAJO-628
                 URL: https://issues.apache.org/jira/browse/TAJO-628
             Project: Tajo
          Issue Type: Bug
          Components: distributed query plan
    Affects Versions: 0.8-incubating, 1.0-incubating
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi


Distinct aggregation requires three stages. But, the second stage can be scheduled to one node due to wrong counting of grouping keys.

This patch fixes this bug. In addition, this patch fixes some trivial bugs in Task.java that I found during this debugging.



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