TisonKun opened a new pull request #6872: [FLINK-10436] Add ConfigOption#withFallbackKeys URL: https://github.com/apache/flink/pull/6872 ## What is the purpose of the change Add `ConfigOption#withFallbackKeys` to implement a similar function with `ConfigOption#withDeprecatedKeys`. That is, the `fallbackKey` falls back to current key if it has not been specified, but the use of current key would not print a deprecated message. ## Brief change log - Introduce `FallbackKey` class to represent a key with `isDeprecated` message. - Replace `deprecatedKeys` to `fallbackKeys` in `ConfigOption` ## Verifying this change - Add a test `ConfigurationTest#testFallbackKeys` to check the fallback mechanism works. - Manually check the issue report by the corresponding JIRA disappear. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no) - If yes, how is the feature documented? (not applicable) cc @tillrohrmann
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