AHeise commented on a change in pull request #15505:
URL: https://github.com/apache/flink/pull/15505#discussion_r608516263



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File path: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/SubtaskCheckpointCoordinatorTest.java
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@@ -198,14 +198,6 @@ public void broadcastEvent(AbstractEvent event, boolean 
isPriorityEvent)
                             throws IOException {
                         super.broadcastEvent(event, isPriorityEvent);
                         broadcastedPriorityEvent.set(isPriorityEvent);
-                        // test if we can write output data

Review comment:
       FORCE_ALIGNED checkpoint has no channel state on input side. But the 
barrier is translated into its prior form in `SubtaskCheckpointCoordinator` and 
thus can have output data written.
   This portion actually tests that the conversion succeeded and output data 
can be written.




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