xintongsong opened a new pull request #10397: [FLINK-15023][core][runtime] 
Remove on-heap managed memory
   ## What is the purpose of the change
   This PR is part or FLIP-49. It completely remove on-heap managed memory, 
keeping managed memory always off-heap.
   This PR is based on #10161.
   ## Brief change log
   - 57b5721509e91a947c435e53a7f3f9a92338f3c2: Remove on-heap managed memory 
from `ResourceProfile`
   - 75212f2d6450f063e4eed8a36cf7a2995f2c9584: Remove on-heap managed memory 
from `ResourceSpec`
   - 4bfdc701fe0e113708ff80404328b4d87489052d: Remove on-heap managed memory 
fraction from `StreamConfig`, and its calculation logic from 
   - 6e8283e9bc711a77dc03dae8cc45194ae53776fd: Remove on-heap managed memory 
from `TaskExecutorResourceSpec` and `TaskExecutorResourceUtils`.
   - a33b5d69fad78265da1d675d82dfe05dbfb07593: Remove config options of managed 
memory off-heap size / fraction and legacy memory off-heap.
   ## 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)
     - 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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