Zakelly opened a new pull request, #25367:
URL: https://github.com/apache/flink/pull/25367

   ## What is the purpose of the change
   
   After [FLINK-36117](https://issues.apache.org/jira/browse/FLINK-36117), we 
port old state backends implementation to new api using 
AsyncKeyedStateBackendAdaptor, but it cannot work because the KeyContext is not 
properly handled. This PR fixes this.
   
   
   ## Brief change log
   
    - Add a listener for state context switch, make all 
`AsyncKeyedStateBackend` implement it.
    - For `AsyncKeyedStateBackendAdaptor`, set current key when a context 
switched.
   
   ## Verifying this change
   
   This change is without any test coverage, since it is difficult to be 
covered by a UT.
   
   ## 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): yes
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, 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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