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https://issues.apache.org/jira/browse/TAJO-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386109#comment-14386109
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ASF GitHub Bot commented on TAJO-1311:
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GitHub user blrunner opened a pull request:
https://github.com/apache/tajo/pull/478
TAJO-1311: Enable Scattered Hash Shuffle for CTAS statement.
Currently, Tajo just use hash shuffle for CTAS statement. If you use large
partitioned table for target table, you will see poor performance of wrong task
number. Thus, we need to calculate the number for the partitioned table with
scattered hash shuffle.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/blrunner/tajo TAJO-1311-NEW
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/478.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #478
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commit 8a7310e34bfde95371a6f5df89154fa1150c029a
Author: JaeHwa Jung <[email protected]>
Date: 2015-03-30T02:35:40Z
TAJO-1311: Enable Scattered Hash Shuffle for CTAS statement.
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> Enable Scattered Hash Shuffle for CTAS statement.
> -------------------------------------------------
>
> Key: TAJO-1311
> URL: https://issues.apache.org/jira/browse/TAJO-1311
> Project: Tajo
> Issue Type: Improvement
> Components: distributed query plan
> Reporter: Jaehwa Jung
> Assignee: Jaehwa Jung
> Fix For: 0.11.0
>
> Attachments: TAJO-1311.patch
>
>
> Currently, Tajo just use hash shuffle for CTAS statement. If you use large
> partitioned table for target table, you will see poor performance of wrong
> task number. Thus, we need to calculate the number for the partitioned table
> with scattered hash shuffle.
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