PatrickRen opened a new pull request #17519:
URL: https://github.com/apache/flink/pull/17519


   ## What is the purpose of the change
   
   This PR changes the launching command of Flink container to print JM and TM 
logs on STDOUT, which will then be consumed back in log4j when running tests
   
   
   ## Brief change log
   
   - Print logs JobManager and TaskManager on STDOUT in Flink container for 
redirecting to log4j in tests
   
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as 
`KafkaSourceE2ECase`
   
   ## 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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