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https://issues.apache.org/jira/browse/TAJO-691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940054#comment-13940054
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hyoungjunkim commented on TAJO-691:
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I suggest MapDB's LongHashMap. Please check the bellow site.
http://www.mapdb.org/
http://kotek.net/blog/3G_map
> 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
>
> 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.
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