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https://issues.apache.org/jira/browse/HIVE-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291024#comment-14291024
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Lefty Leverenz commented on HIVE-1642:
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Doc done: The wiki documents all the configuration parameters created in this
issue (some of them renamed).
* [hive.smalltable.filesize or hive.mapjoin.smalltable.filesize |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.smalltable.filesizeorhive.mapjoin.smalltable.filesize]
* [hive.auto.convert.join |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.auto.convert.join]
* [hive.hashtable.initialCapacity |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.hashtable.initialCapacity]
* [hive.hashtable.loadfactor |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.hashtable.loadfactor]
* [hive.mapjoin.localtask.max.memory.usage |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.mapjoin.localtask.max.memory.usage]
* [hive.mapjoin.check.memory.rows |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.mapjoin.check.memory.rows]
* [hive.debug.localtask |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.debug.localtask]
A description is still needed for *hive.debug.localtask*.
> Convert join queries to map-join based on size of table/row
> -----------------------------------------------------------
>
> Key: HIVE-1642
> URL: https://issues.apache.org/jira/browse/HIVE-1642
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Liyin Tang
> Fix For: 0.7.0
>
> Attachments: hive-1642_10.patch, hive-1642_11.patch,
> hive-1642_5.patch, hive-1642_6.patch, hive-1642_7.patch, hive-1642_9.patch,
> hive_1642_1.patch, hive_1642_2.patch, hive_1642_4.patch
>
>
> Based on the number of rows and size of each table, Hive should automatically
> be able to convert a join into map-join.
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