Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5487#discussion_r170014483
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/JobMaster.java 
---
    @@ -447,6 +453,165 @@ public void postStop() throws Exception {
                return CompletableFuture.completedFuture(Acknowledge.get());
        }
     
    +   @Override
    +   public CompletableFuture<Acknowledge> rescaleJob(
    +                   int newParallelism,
    +                   RescalingBehaviour rescalingBehaviour,
    +                   Time timeout) {
    +           final ArrayList<JobVertexID> allOperators = new 
ArrayList<>(jobGraph.getNumberOfVertices());
    +
    +           for (JobVertex jobVertex : jobGraph.getVertices()) {
    +                   allOperators.add(jobVertex.getID());
    +           }
    +
    +           return rescaleOperators(allOperators, newParallelism, 
rescalingBehaviour, timeout);
    +   }
    +
    +   @Override
    +   public CompletableFuture<Acknowledge> rescaleOperators(
    --- End diff --
    
    Yes it will be necessary, once we do rescaling for individual operators. 
This will be the case with the rescaling policies.


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