You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@tajo.apache.org by "hyoungjunkim (JIRA)" <ji...@apache.org> on 2014/03/21 20:11:45 UTC

[jira] [Updated] (TAJO-691) HashJoin or HashAggregation is too slow if there is many unique keys

     [ https://issues.apache.org/jira/browse/TAJO-691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

hyoungjunkim updated TAJO-691:
------------------------------

    Attachment: TAJO-691.patch

> HashJoin or HashAggregation is too slow if there is many unique keys
> --------------------------------------------------------------------
>
>                 Key: TAJO-691
>                 URL: https://issues.apache.org/jira/browse/TAJO-691
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: hyoungjunkim
>            Assignee: hyoungjunkim
>         Attachments: TAJO-691.patch
>
>
> HashJoin or HashAggregation is too slow if there is many unique keys.
> Java's native Map is inefficient  to handle many items. In case more than 1 million items in HashMap, Adding 10000 items takes more than 7 ~ 10 seconds.   
> This should be improved.



--
This message was sent by Atlassian JIRA
(v6.2#6252)