Remove JDBM component from Map Join
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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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