hlteoh37 opened a new pull request, #21538:
URL: https://github.com/apache/flink/pull/21538

   …eratorCoordinator
   
   ## What is the purpose of the change
   * Improve the stability of the JobMaster when OperatorCoordinator throws an 
Exception upon start(). Instead of restarting the entire JobMaster, we will 
directly restart the job instead.
   
   ## Brief change log
   * Catch non-fatal Throwables when starting OperatorCoordinator, and fail the 
job instead of rethrowing the JobMaster main thread.
   
   ## Verifying this change
   This change added tests and can be verified as follows:
   - Added unit test to verify that an OperatorCoordinator exception triggers a 
job failure without terminating the running thread.
   
   ## 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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