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https://issues.apache.org/jira/browse/TAJO-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726766#comment-14726766
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ASF GitHub Bot commented on TAJO-1809:
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GitHub user jihoonson opened a pull request:
https://github.com/apache/tajo/pull/718
TAJO-1809: Change default value of several configurations
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jihoonson/tajo-2 TAJO-1809
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/718.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 #718
----
commit 3410c7691a4b61bdeeac1d629fa0f7ded7463a8e
Author: Jihoon Son <[email protected]>
Date: 2015-09-02T04:20:28Z
TAJO-1809
commit de504416c61097486e8bdd0aafc65b20eafb95e7
Author: Jihoon Son <[email protected]>
Date: 2015-09-02T04:41:07Z
TAJO-1809
commit 64026ec029a0b24768bbb2a8772429f0628c0be9
Author: Jihoon Son <[email protected]>
Date: 2015-09-02T05:19:18Z
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into
TAJO-1809
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> Change default value of several configurations
> ----------------------------------------------
>
> Key: TAJO-1809
> URL: https://issues.apache.org/jira/browse/TAJO-1809
> Project: Tajo
> Issue Type: Task
> Components: conf and scripts
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Fix For: 0.11.0
>
>
> Tajo has many configurations. For the sake of user convenience, they all have
> some default value. Most of default values make sense, but some are not. Here
> is my idea.
> * Tajo can choose hash-based algorithm and disk-based algorithm according to
> the remaining resource and query workload. Here, users can give a hint using
> session variables whose name is HASH_*_SIZE_LIMIT. Their current default
> value is 256 MB, but it's too large thereby incurring GC so often, and even
> OOM sometimes.
> * Query cache should be disabled by default. It will not be commonly used.
> * Configurations for broadcast join should accept numbers in MB.
> * Some configurations allow different unit in tajo-site.xml and session
> variable. This must be consistent.
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