You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2013/01/14 23:34:12 UTC
[jira] [Commented] (HIVE-2555) Make the hashmap in map-side group
by pluggable
[ 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira