XComp commented on code in PR #21019:
URL: https://github.com/apache/flink/pull/21019#discussion_r993681403


##########
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGenerator.java:
##########
@@ -298,6 +303,27 @@ private JobGraph createJobGraph() {
         return jobGraph;
     }
 
+    private void waitForSerializationFuturesAndUpdateJobVertices()
+            throws ExecutionException, InterruptedException {
+        for (JobVertex jobVertex : jobGraph.getVertices()) {
+            final 
List<CompletableFuture<SerializedValue<OperatorCoordinator.Provider>>>
+                    futuresForJobVertex = 
coordinatorSerializationFutures.remove(jobVertex.getID());
+            if (futuresForJobVertex == null) {
+                LOG.warn(
+                        "No OperatorCoordinator creator serialized for 
JobVertex {}.",
+                        jobVertex.getID());
+            } else {
+                FutureUtils.combineAll(futuresForJobVertex)
+                        .get()
+                        .forEach(jobVertex::addOperatorCoordinator);
+            }
+        }
+        Preconditions.checkState(
+                coordinatorSerializationFutures.isEmpty(),
+                "There are still serialization futures not processed for 
JobVertex instances: {}",

Review Comment:
   I rephrased the condition that should never occur... Were you suggesting 
that we should still wait for the concurrent operations to be completed? 
:thinking: I didn't implement that because this specific state would mean that 
there's some bug somewhere else. The Precondition should trigger the 
`IllegalStateException` causing the JobGraph creation to fail.



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