rkhachatryan opened a new pull request #19311:
URL: https://github.com/apache/flink/pull/19311


   ## What is the purpose of the change
   
   ```
   CopyOnWriteStateMap copies the entry before returning it to the client
   for update. This also updates its state and entry versions.
   
   However, if the entry is NOT used by any snapshots, the versions
   will stay the same despite that state is going to be updated.
   
   With incremental checkpoints, this causes such updated version to
   be ignored in the next snapshot.
   
   This change bumps the state version in this case (entry version
   stays the same).
   ```
   
   ## Verifying this change
   
   Multiple IT cases in 
https://github.com/rkhachatryan/flink/tree/flip-151-full,
   e.g. 
    - 
`ProcessingTimeWindowCheckpointingITCase.testAggregatingTumblingProcessingTimeWindow
 
    - `EventTimeWindowCheckpointingITCase.testSlidingTimeWindow`
    - `AggregateITCase.testWindowWithUnboundedAgg`
   
   ## 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, Kubernetes/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? no
   


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