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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2015/09/02 04:06:46 UTC

[jira] [Updated] (TAJO-1722) Even distribution of intermediate data for join queries

     [ https://issues.apache.org/jira/browse/TAJO-1722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jihoon Son updated TAJO-1722:
-----------------------------
    Fix Version/s:     (was: 0.11.0)
                   0.12.0

> 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: 0.12.0
>
>
> 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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