TisonKun commented on issue #6872: [FLINK-10436] Add ConfigOption#withFallbackKeys URL: https://github.com/apache/flink/pull/6872#issuecomment-431058218 The idea we need a fallback key is because keyA and keyB(with keyA fallback to keyB) are conceptually not the same thing or keyB succeed keyA. It just, in the context, we use the configured keyB as a default(fallback) value to keyA. And I agree that if the key's semantic changes, we should update the fallback dependency on demand.
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