Jihoon Son created TAJO-1809:
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Summary: 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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