[GitHub] [kafka] C0urante commented on pull request #12041: MINOR: ignore unused configuration when ConsumerCoordinator is not constructed

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C0urante commented on PR #12041:
URL: https://github.com/apache/kafka/pull/12041#issuecomment-1115515896

   Thanks Guozhang. I think the cost of logging warnings in cases like this is fairly low as users can and should adjust their configurations to not use nonsensical properties, and the benefit can be high in the event that a user is confused about client behavior. I do sympathize with concerns that the warning for an unused property may make it seem like the property is unconditionally unrecognized (i.e., not defined by a client at all) instead of conditionally unrecognized (i.e., not used because of other properties).
   
   One alternative could be to use the newly-introduced [ConnectUtils::ensureProperty](https://github.com/apache/kafka/blob/8245c9a3d5af2ad891844194a5fa281af471b568/connect/runtime/src/main/java/org/apache/kafka/connect/util/ConnectUtils.java#L77-L101) or something similar to it (possibly one that logs a warning if _any_ value for a specific property is given, regardless of whether it matches the default). This way, we could continue logging warnings for cases like these, but make it clear exactly why the property should not be included in the config.
   
   Either way, I think the piecemeal logic introduced in this PR is suboptimal. Dedicating one line for every to-be-ignored property is unnecessary if we want to remove these warnings for all properties defined by a client; in that case, we can use the [approach I described earlier](https://github.com/apache/kafka/pull/12041#issuecomment-1100583118), which will be easier to maintain and take up less space.


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