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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1754) Remove JDBM component from Map Join
Date Wed, 27 Oct 2010 01:28:21 GMT
Remove JDBM component from Map Join
-----------------------------------

                 Key: HIVE-1754
                 URL: https://issues.apache.org/jira/browse/HIVE-1754
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
    Affects Versions: 0.6.0, 0.7.0
            Reporter: Liyin Tang
            Assignee: Liyin Tang
             Fix For: 0.7.0


Right now, JDBM is the major performance bottleneck of performance.
With the growth of the small table, the PUT and GET operation will take most of execution
time.

Map Join is designed to load the data of small table into memory. 
If the data is too large to hold in memory, then there is no need to use the map join strategy.



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