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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-10704) Errors in Tez HashTableLoader when estimated table size is 0
Date Thu, 14 May 2015 01:48:59 GMT
Jason Dere created HIVE-10704:
---------------------------------

             Summary: Errors in Tez HashTableLoader when estimated table size is 0
                 Key: HIVE-10704
                 URL: https://issues.apache.org/jira/browse/HIVE-10704
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Jason Dere
            Assignee: Jason Dere


Couple of issues:
- If the table sizes in MapJoinOperator.getParentDataSizes() are 0 for all tables, the largest
small table selection is wrong and could select the large table (which results in NPE)

- The memory estimates can either divide-by-zero, or allocate 0 memory if the table size is
0. Try to come up with a sensible default for this.



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