zhuzhurk opened a new pull request #11148: [FLINK-16180][runtime] Replace the 
nullable vertexExecution in ScheduledUnit with a non-null executionVertexId
URL: https://github.com/apache/flink/pull/11148
 
 
   ## What is the purpose of the change
   
   ScheduledUnit#vertexExecution is nullable but ProgrammedSlotProvider 
requires it to be non-null to work. This makes ProgrammedSlotProvider not able 
to be used by new scheduler tests since vertexExecution is never set in the new 
scheduler code path. It blocks us from reworking tests which are based legacy 
scheduling to base on the new scheduler.
   
   Thus I opened this PR to replace the nullable vertexExecution with a 
non-null executionVertexID.
   
   It also naturally fixes 2 other issues:
   1. The log printed in SchedulerImpl#allocateSlotInternal(...) can be broken 
since the vertexExecution can be null.
   2. an NPE issue reported in FLINK-16145.
   
   ## Brief change log
   
   See commits.
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as *ExecutionTests*.
   
   ## 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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