[jira] [Created] (AMBARI-17745) Disallow {{variable}} in configs that load variables from python files since very error-prone and not maintainable

[Alejandro Fernandez (JIRA)]

Alejandro Fernandez created AMBARI-17745:
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             Summary: Disallow {{variable}} in configs that load variables from 
python files since very error-prone and not maintainable
                 Key: AMBARI-17745
                 URL: https://issues.apache.org/jira/browse/AMBARI-17745
             Project: Ambari
          Issue Type: Story
          Components: stacks
    Affects Versions: 2.4.0
            Reporter: Alejandro Fernandez
             Fix For: trunk


Today, we allow configs to contain values like {{variable}} that are 
interpreted by loading variables from params.py, params_linux.py, or 
status_params.py

This type of code is very dangerous because if the config gets saved in the DB, 
and then the user upgrades the stack or changes the value, or Ambari modifies 
the variable name, then it will be broken.

The fact that python code cannot then rename a variable is an extremely poor 
design choice.
We should remove the dynamic interpretation of {{python_variable}}.
We only need to be able to read from other configs saved in the DB.




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