[GitHub] [incubator-druid] drcrallen commented on issue #8083: Principle for treating configuration errors

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drcrallen commented on issue #8083: Principle for treating configuration errors
URL: https://github.com/apache/incubator-druid/issues/8083#issuecomment-511479641
 
 
   I don't believe there is a single best way to handle wrong configuration. I propose the severity of the reaction be related to the detectability and impact of the failure mode.
   
   As a simple example, if I have a config option I know is coming in 0.16.0, and I put it in a config file for 0.15.0 knowing it will be ignored in that version, I expect the system to politely ignore the config. Likewise if a config option is deprecated in 0.15.0, and will be gone in 0.16.0, then the system should warn of the use of a deprecated option during the 0.15.0 transition release.
   
   Part of the reason I am against outright failure on *all* configuration problems is that there are many ways configurations can be odd and not actually a problem, and possibly even intended.
   
   I propose having an outright error only in cases where the system effectively says "You have not told me what to do and I have no reasonable default, or you have told me too many things to do and I can't reconcile them."
   
   Examples of the first case are things like passing in arrays when single values are required (parsing). Examples of the second are when multiple things are defined for a singleton. But even then that is only if they can't be reconciled (ex: just take the last one sequentially in the properties file)
   
   

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