Zakelly opened a new pull request, #29445:
URL: https://github.com/apache/flink/pull/29445

   ## What is the purpose of the change
   
   Fix FLINK-36297 by waiting up to 5 seconds for the periodic materialization 
scheduler to terminate during close, allowing running scheduler callbacks to 
finish before cleanup continues.
   
   ## Brief change log
   
     - Await scheduler termination after `shutdownNow()`.
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as 
`PeriodicMaterializationManagerTest`.
   
   ## 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, 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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   Generated-by: Codex (GPT-6)


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