chadrik commented on a change in pull request #12881:
URL: https://github.com/apache/beam/pull/12881#discussion_r491722936



##########
File path: sdks/python/apache_beam/runners/worker/log_handler.py
##########
@@ -156,9 +174,11 @@ def _write_log_entries(self):
         done = True
         log_entries.pop()
       if log_entries:
-        yield beam_fn_api_pb2.LogEntry.List(log_entries=log_entries)
+        yield beam_fn_api_pb2.LogEntry.List(
+            log_entries=cast(List[beam_fn_api_pb2.LogEntry], log_entries))

Review comment:
       we have to cast here because `log_entries` was initialized as a 
`List[Union[..., Sentinel]]`, and just above this line we checked for the 
sentinel and popped it out, but mypy can't track that. 




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