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From "Szehon Ho (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-8943) Fix memory limit check for combine nested mapjoins
Date Fri, 21 Nov 2014 18:54:35 GMT
Szehon Ho created HIVE-8943:
-------------------------------

             Summary: Fix memory limit check for combine nested mapjoins 
                 Key: HIVE-8943
                 URL: https://issues.apache.org/jira/browse/HIVE-8943
             Project: Hive
          Issue Type: Bug
          Components: Spark
    Affects Versions: spark-branch
            Reporter: Szehon Ho


Its the opposite problem of what we thought in HIVE-8701.

SparkMapJoinOptimizer actually does combine nested mapjoins into one work due to removal of
RS for big-table.  So we actually need to enhance the check to calculate if all the MapJoins
in that work (spark-stage) will fit into the memory, otherwise it might overwhelm memory for
that particular spark executor.



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