[TAJO-1802] PythonScriptEngine copies controller and tajo util whenever it is initialized

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Function/UDF
• Assignee: Jihoon Son
• Reporter: Jihoon Son
• Created: 26/Aug/15 02:28
• Updated: 02/Sep/15 09:54
• Resolved: 02/Sep/15 09:28

Description

In the current implementation, python script files are copied and deleted whenever a task is launched and stopped. This incurs two problems.

• Frequent copy of script files degrades the overall performance.
• Among python scripts, tajo_util.py is shared by multiple tasks of a worker. This incurs I/O problem during unit tests because the shared file is also removed when a task is stopped.