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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2555) Make the hashmap in map-side group by pluggable
Date Mon, 14 Jan 2013 22:34:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553210#comment-13553210
] 

Ashutosh Chauhan commented on HIVE-2555:
----------------------------------------

Is there some evidence that hashmap we currently use is really bad and these alternatives
provide better performance.
                
> Make the hashmap in map-side group by pluggable
> -----------------------------------------------
>
>                 Key: HIVE-2555
>                 URL: https://issues.apache.org/jira/browse/HIVE-2555
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Namit Jain
>         Attachments: HIVE-2555.2.patch, HIVE-2555.3.patch, HIVE-2555.4.patch
>
>
> There are a couple of implementations available (other than java.util.HashMap) - COLT,
TROVE etc. to name a few.
> If the hashmap was pluggable, it would be easy to play around with different hash maps
and tune performance.

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