y1chi commented on a change in pull request #15441:
URL: https://github.com/apache/beam/pull/15441#discussion_r721799128



##########
File path: 
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py
##########
@@ -471,9 +559,17 @@ def _collect_written_timers(
             timer_watermark_data[(transform_id, timer_family_id)] = min(
                 timer_watermark_data[(transform_id, timer_family_id)],
                 decoded_timer.hold_timestamp)
-        newly_set_timers[(transform_id, timer_family_id)] = ListBuffer(
-            coder_impl=timer_coder_impl)
-        newly_set_timers[(transform_id, timer_family_id)].append(out.get())
+          else:
+            # Timer was cleared, so we must skip setting it below.
+            timer_cleared = True
+            continue
+        if timer_cleared or (transform_id,

Review comment:
       I'm not sure that's the case when it is grpc data channel 
https://github.com/apache/beam/blob/master/sdks/python/apache_beam/runners/worker/bundle_processor.py#L669,
 IIUC every time timer calls set it will write an output timer to the output 
queue.




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