[GitHub] [flink] klion26 opened a new pull request #8565: [FLINK-11947] Support MapState value schema evolution for RocksDB

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klion26 opened a new pull request #8565: [FLINK-11947] Support MapState value schema evolution for RocksDB
URL: https://github.com/apache/flink/pull/8565
 
 
   ## What is the purpose of the change
   
   Currently, we do not attempt to perform state schema evolution if the key or value's schema of a user MapState has changed when using RocksDB, with this commit we support value's schema evolution for RocksDBMapState.
   
   ## Brief change log
   
   add value's schema evolution for RocksDBMapState when migration
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - StateBackendMigrationTestBase#{testKeyedMapStateAsIs, testKeyedMapStateStateMigration, testKeyedMapStateSerializerReconfiguration, testKeyedMapStateRegistrationFailsIfNewStateSerializerIsIncompatible}
   
   ## 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)`: (**no**)
     - 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**)
   

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