[GitHub] TisonKun opened a new pull request #6872: [FLINK-10436] Add ConfigOption#withFallbackKeys

[GitBox <gi...@apache.org>]

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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