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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-170) map-side aggregations does not work properly
Date Thu, 11 Dec 2008 23:35:44 GMT
map-side aggregations does not work properly
--------------------------------------------

                 Key: HIVE-170
                 URL: https://issues.apache.org/jira/browse/HIVE-170
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Namit Jain
            Assignee: Namit Jain


map-side aggregation depends on runtime.freememory() which is not guaranteed to return the
freeable memory - it depends on when the garbage collector is invoked last.
It might be a good idea to estimate the number of rows that can fit in the hash table and
then flush the hash table based on that

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