zentol commented on code in PR #22169:
URL: https://github.com/apache/flink/pull/22169#discussion_r1147328427


##########
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/adaptive/Executing.java:
##########
@@ -123,9 +123,18 @@ private void handleDeploymentFailure(ExecutionVertex 
executionVertex, JobExcepti
     }
 
     @Override
-    public void notifyNewResourcesAvailable() {
-        if (context.canScaleUp(getExecutionGraph())) {
-            getLogger().info("New resources are available. Restarting job to 
scale up.");
+    public void onNewResourcesAvailable() {
+        maybeRescale();
+    }
+
+    @Override
+    public void onNewResourceRequirements() {
+        maybeRescale();
+    }

Review Comment:
   > do you mean it contradicts the current behavior of Reactive Scheduling?
   
   Reactive mode isn't affected because there the actual requirements don't 
change.
   
   > I think there's no contradiction with "scale down whenever possible" if we 
interpret it as "scale down whenever cumulative parallelism decreases".
   
   That would indeed not be contradictory, but not really a desirable behavior? 
Not without some fallback condition at least... (like a timeout).
   
   > Shall we create a ticket for that? (maybe one catch-all ticket for now)
   
   Will do.



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