xintongsong opened a new pull request #10860: [FLINK-15145][config] Change TM 
memory configuration default values for FLIP-49.
URL: https://github.com/apache/flink/pull/10860
 
 
   ## What is the purpose of the change
   
   This PR updates FLIP-49 TM memory sizes configuration default values 
according to the outcome of tuning with real jobs.
   
   ## Brief change log
   
   - JVM overhead min: 128MB -> 192MB
   - JVM metaspace: 128MB -> 96MB
   - Total process size (in default flink-conf.yaml): 1024MB -> 1568MB
   
   ## 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): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, 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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