xiangqiao123 opened a new pull request #17453:
URL: https://github.com/apache/flink/pull/17453


   ## Fix the duplicate log output of libraries/connectors,when logback is used
   When logback is used, the logs of libraries / connectors are output 
repeatedly.
   
   By default, appenders are cumulative: a logger will log to the appenders 
attached to itself (if any) as well as all the appenders attached to its 
ancestors. Thus, attaching the same appender to multiple loggers will cause 
logging output to be duplicated.
   
   http://logback.qos.ch/manual/configuration.html#cumulative
   
   
   ## Verifying this change
   This change is a trivial rework / code cleanup without any test coverage.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't 
know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / 
JavaDocs / not documented)
   


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