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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-1722) Even distribution of intermediate data for join queries
Date Wed, 02 Sep 2015 01:46:45 GMT

    [ https://issues.apache.org/jira/browse/TAJO-1722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726567#comment-14726567

Hyunsik Choi commented on TAJO-1722:

This issue does not seem to be critical in 0.11.0 release. If you didn't start this issues,
it would be better if you reschedule this issue.

> Even distribution of intermediate data for join queries
> -------------------------------------------------------
>                 Key: TAJO-1722
>                 URL: https://issues.apache.org/jira/browse/TAJO-1722
>             Project: Tajo
>          Issue Type: Improvement
>          Components: distributed query plan
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>             Fix For: 0.11.0
> Data skew is one of the most important problems which affects to the query performance
in distributed systems. To do handle this problem, we have used an algorithm for evenly distributing
intermediate data for aggregation.
> This ticket is to apply our algorithm for join queries, too.

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