XComp opened a new pull request, #22893:
URL: https://github.com/apache/flink/pull/22893

   ## What is the purpose of the change
   
   This Precondition can be enabled because the processing of revoke calls is 
not happening anymore during close. The event processing is protected by the 
running flag within DefaultLeaderElectionService which is set to false as part 
of the close mechanism.
   
   ## Brief change log
   
   * Enables the Precondition
   
   ## Verifying this change
   
   I left the test case (with some refactoring) because it's a valid test to 
verify that we don't run into issues when an event is processed after the 
contender was already deregistered.
   
   ## 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: yes
     - 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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