zhuzhurk opened a new pull request #9936: [FLINK-14450][runtime] Change 
SchedulingTopology to extend base topology
URL: https://github.com/apache/flink/pull/9936
 
 
   
   ## What is the purpose of the change
   
   This PR is to change SchedulingTopology to extend the base topology 
introduced in FLINK-14330.
   
   More details see FLINK-14330
   
   ## Brief change log
   
     - *Introduced IterableUtils*
     - *Change SchedulingTopology to extend the base topology and unifying the 
interfaces*
     - *Refactored the implementations of SchedulingTopology*
     - *Refactored the usages of SchedulingTopology*
   
   
   ## Verifying this change
   
     - *Most changes are trivial rework without any test coverage.*
     - *Added unit tests for 
ExecutionGraphToSchedulingTopologyAdapter#containsCoLocationConstraints*
   
   ## 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, Yarn/Mesos, 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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