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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1754) Remove JDBM component from Map Join
Date Thu, 04 Nov 2010 16:15:43 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928262#action_12928262
] 

Liyin Tang commented on HIVE-1754:
----------------------------------

This patch has some potential bugs. I will fix it today and upload a new one.

> 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
>
>
> 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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