fredia commented on code in PR #25773:
URL: https://github.com/apache/flink/pull/25773#discussion_r1879258285


##########
flink-runtime/src/main/java/org/apache/flink/runtime/asyncprocessing/operators/AbstractAsyncStateStreamOperator.java:
##########
@@ -330,7 +332,22 @@ public void processWatermark(Watermark mark) throws 
Exception {
             super.processWatermark(mark);
             return;
         }
-        asyncExecutionController.processNonRecord(() -> 
super.processWatermark(mark));
+        asyncExecutionController.processNonRecord(
+                () -> {
+                    // todo: make async operator deal with interruptible 
watermark
+                    if (timeServiceManager != null) {
+                        CompletableFuture<Void> future = 
timeServiceManager.advanceWatermark(mark);
+                        if (asyncExecutionController.isSerialMode()) {
+                            asyncExecutionController.drainInflightRecords(0);
+                            future.get();
+                            output.emitWatermark(mark);
+                        } else {
+                            future.thenAccept(v -> output.emitWatermark(mark));
+                        }

Review Comment:
   Nice suggestion, moved the `drain` and `assert future.isDone()` into AEC.



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