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https://issues.apache.org/jira/browse/TAJO-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jihoon Son updated TAJO-1809:
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Attachment: TAJO-1809_2.patch
> 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
>
> Attachments: TAJO-1809.patch, TAJO-1809_2.patch
>
>
> 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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