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https://issues.apache.org/jira/browse/HIVE-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930291#action_12930291
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He Yongqiang commented on HIVE-1754:
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will take a close look.
> 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
>
> Attachments: Hive-1754.patch, Hive-1754_2.patch, Hive-1754_3.patch,
> hive-1754_4.patch, hive-1754_5.patch
>
>
> 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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