gaoyunhaii opened a new pull request #14734:
URL: https://github.com/apache/flink/pull/14734


   ## What is the purpose of the change
   
   This PR refactors the CheckpointCoordinator logic to compute the tasks to 
trigger/wait/commit dynamically. Previously it is done during compile phase and 
passed to CheckpointCoordinator via JobGraph. This is a premise for support 
considering finished tasks into checkpoint, since considering finished tasks 
would cause each checkpoint might need to trigger different tasks and have to 
re-compute at each checkpoint
   
   
   ## Brief change log
   
   - 721dd38bb286722cbb1a6925dbedbb3614930b20 did the refactor.
   
   ## Verifying this change
   
   This change is a code refactor and could be covered by existing tests. 
   
   ## 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? **not applicable**
   


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