tillrohrmann commented on a change in pull request #7568: [FLINK-11417] Make 
access to ExecutionGraph single threaded from JobMaster main thread
URL: https://github.com/apache/flink/pull/7568#discussion_r250624427
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java
 ##########
 @@ -813,9 +832,11 @@ public Executor getFutureExecutor() {
 
        public void attachJobGraph(List<JobVertex> topologiallySorted) throws 
JobException {
 
+               assertRunningInJobMasterMainThread();
+
                LOG.debug("Attaching {} topologically sorted vertices to 
existing job graph with {} " +
                                "vertices and {} intermediate results.",
-                               topologiallySorted.size(), tasks.size(), 
intermediateResults.size());
+                       topologiallySorted.size(), tasks.size(), 
intermediateResults.size());
 
 Review comment:
   Indentation of this statement looks odd.

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