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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6418) MapJoinRowContainer has large memory overhead in typical cases
Date Thu, 27 Feb 2014 00:47:19 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13913813#comment-13913813
] 

Lefty Leverenz commented on HIVE-6418:
--------------------------------------

This introduces a new config parameter, *hive.mapjoin.lazy.hashtable*, which needs documentation.

But don't document it in hive-default.xml.template because that's going to be overwritten
after HIVE-6037 commits.  You could document it in a comment in HiveConf.java but most of
the parameter comments will go away with HIVE-6037 and the descriptions will be incorporated
into the parameter definitions.

So maybe the best course is to document it here in a release note, then it can be added to
HiveConf.java either before or after HIVE-6037 commits.  (I'll make a note there about this
new parameter.)

> MapJoinRowContainer has large memory overhead in typical cases
> --------------------------------------------------------------
>
>                 Key: HIVE-6418
>                 URL: https://issues.apache.org/jira/browse/HIVE-6418
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-6418.01.patch, HIVE-6418.02.patch, HIVE-6418.03.patch, HIVE-6418.04.patch,
HIVE-6418.04.patch, HIVE-6418.05.patch, HIVE-6418.WIP.patch, HIVE-6418.patch
>
>




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