mxm commented on a change in pull request #12531:
URL: https://github.com/apache/beam/pull/12531#discussion_r469068866



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File path: sdks/python/apache_beam/runners/worker/bundle_processor.py
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@@ -647,7 +647,7 @@ def set(self, ts):
         windows=(self._window, ),
         clear_bit=False,
         fire_timestamp=ts,
-        hold_timestamp=self._input_timestamp,
+        hold_timestamp=ts,

Review comment:
       Do you mean to keep the input timestamp if we have a processing time 
timer? 
   
   As far as I'm concerned, the hold/output timestamp is only relevant for 
event time timers. Processing timers do not operate in event time and thus do 
not respect this timestamp, no matter what it is set to. Unless there is a good 
reason for introducing this conditional behavior, I'd keep it as-is.




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