boyuanzz commented on a change in pull request #12836:
URL: https://github.com/apache/beam/pull/12836#discussion_r490541733



##########
File path: 
runners/direct-java/src/main/java/org/apache/beam/runners/direct/WatermarkManager.java
##########
@@ -1624,7 +1630,15 @@ public TimerUpdateBuilder setTimer(TimerData setTimer) {
        */
       public TimerUpdateBuilder deletedTimer(TimerData deletedTimer) {
         deletedTimers.add(deletedTimer);
-        setTimers.remove(deletedTimer);
+        TimerData timerToDelete = null;
+        for (TimerData timer : setTimers) {
+          if (timer.getDomain().equals(deletedTimer.getDomain())
+              && timer.getNamespace().equals(deletedTimer.getNamespace())
+              && timer.getTimerId().equals(deletedTimer.getTimerId())) {
+            timerToDelete = timer;
+          }
+        }
+        setTimers.remove(timerToDelete);

Review comment:
       Clearing an unset timer seems to be like a no-op to me.




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