StephanEwen commented on a change in pull request #15557:
URL: https://github.com/apache/flink/pull/15557#discussion_r612806509



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/operators/coordination/OperatorCoordinator.java
##########
@@ -202,8 +202,7 @@ default void notifyCheckpointAborted(long checkpointId) {}
          * target TaskManager. The future is completed exceptionally if the 
event cannot be sent.
          * That includes situations where the target task is not running.
          */
-        CompletableFuture<Acknowledge> sendEvent(OperatorEvent evt, int 
targetSubtask)
-                throws TaskNotRunningException;
+        CompletableFuture<Acknowledge> sendEvent(OperatorEvent evt, int 
targetSubtask);

Review comment:
       I will leave the "received" future for now, because this is on the more 
general `OperatorCoordinator` interface. The `SourceEnumerator` interface 
doesn't expose this, which is the most important part (public API). 




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