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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12325) Turn hive.map.groupby.sorted on by default
Date Sat, 07 Nov 2015 08:04:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995113#comment-14995113
] 

Lefty Leverenz commented on HIVE-12325:
---------------------------------------

Doc note:  This changes the default value of *hive.map.groupby.sorted* and removes *hive.map.groupby.sorted.testmode*
from HiveConf.java.  Neither is documented yet in the wiki (except for their inclusion in
the 0.13 default for *hive.security.authorization.sqlstd.confwhitelist*), so both need to
be documented with version information about these changes.

* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

*hive.map.groupby.sorted* was introduced by HIVE-3432 in 0.10.0 and *hive.map.groupby.sorted.testmode*
was introduced by HIVE-4281 in 0.11.0.

> Turn hive.map.groupby.sorted on by default
> ------------------------------------------
>
>                 Key: HIVE-12325
>                 URL: https://issues.apache.org/jira/browse/HIVE-12325
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer
>            Reporter: Ashutosh Chauhan
>            Assignee: Chetna Chaudhari
>              Labels: TODOC2.0
>             Fix For: 2.0.0
>
>         Attachments: HIVE-12325.1.patch
>
>
> When applicable it can avoid shuffle phase altogether for group by, which will be a performance
win. 



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