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_r250603863
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/ExecutionGraph.java
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 @@ -1789,4 +1845,10 @@ void notifyExecutionChange(
                        }
                }
        }
+
+       public void assertRunningInJobMasterMainThread() {
+               if (!(jobMasterMainThreadExecutor instanceof 
ComponentMainThreadExecutor.DummyComponentMainThreadExecutor)) {
 
 Review comment:
   Why do we check here whether it is a `DummyComponentMainThreadExecutor`? Do 
we have places where we sometimes want to call 
`DummyComponentMainThreadExecutor#assertRunningInMainThread()` and others not 
(like here)?

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