TisonKun opened a new pull request #7285: [hotfix] [resource manager] Remove 
legacy(unused) class ResourceManag…
URL: https://github.com/apache/flink/pull/7285
 
 
   …erServices
   
   ## What is the purpose of the change
   
   We introduced `ResourceManagerService` in 
9d1b5fb7ab2b1dcb327d026d367bbd7dc3e66f94 
   
   As code evolves, its functions are covered by `ResourceActions`(for 
`allocateResource`) and `FencedRpcEndpoint`(by `getFencingToken`, 
`getMainThreadExecutor` and `runAsync*`). 
   
   Now there is no code depending on `ResourceManagerService` and its functions 
are superseded. We can safely remove it as a clean-up.
   
   ## 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)`: (**no**)
     - 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**)
   
   cc @zentol @StefanRRichter 
   

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