[jira] [Created] (TAJO-1114) Improve ConfVars (SessionVar) to take a validator interface to check its input.

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-1114:
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             Summary: Improve ConfVars (SessionVar) to take a validator interface to check its input.
                 Key: TAJO-1114
                 URL: https://issues.apache.org/jira/browse/TAJO-1114
             Project: Tajo
          Issue Type: Task
            Reporter: Hyunsik Choi


Each task uses session variables from client or configs from tajo-site.xml. The session variables and configs are used in task during query processing.

If invalid configs or invalid session variables are used for a query, the error will be caused in a runtime instead of query init phase. It's bad situation. Invalid values must be detected at the initialization phase.

 Because each session variable or config varies in its value type and value range, It would be great if each ConfigKey takes a validator for its value and Tajo uses validators for it.



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