dianfu commented on code in PR #25965:
URL: https://github.com/apache/flink/pull/25965#discussion_r1913049536


##########
flink-python/src/main/java/org/apache/flink/streaming/api/runners/python/beam/BeamPythonFunctionRunner.java:
##########
@@ -681,7 +686,14 @@ public void onCompleted(BeamFnApi.ProcessBundleResponse 
response) {
 
     private TimerReceiverFactory createTimerReceiverFactory() {
         BiConsumer<Timer<?>, TimerInternals.TimerData> timerDataConsumer =
-                (timer, timerData) -> timerRegistration.setTimer((byte[]) 
timer.getUserKey());
+                (timer, timerData) ->
+                        environment
+                                .getMainMailboxExecutor()

Review Comment:
   `environment.getMainMailboxExecutor()` has a side effect that it will create 
MainMailboxExecutor instance each time called. What about making 
MainMailboxExecutor an instance variable?



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