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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1754) Remove JDBM component from Map Join
Date Tue, 09 Nov 2010 21:24:23 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930291#action_12930291
] 

He Yongqiang commented on HIVE-1754:
------------------------------------

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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