AnandInguva commented on code in PR #27373:
URL: https://github.com/apache/beam/pull/27373#discussion_r1258630585
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sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py:
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@@ -840,6 +841,12 @@ def _execute_bundle(self,
# so we create a copy of the buffer for every new stage.
runner_execution_context.pcoll_buffers[buffer_id] = buffer.copy()
buffer = runner_execution_context.pcoll_buffers[buffer_id]
+ # When the buffer is not in the pcoll_buffers, it means that the
+ # it could be an empty PCollection. In this case, get the buffer using
+ # the buffer id and transform id
+ if buffer is None:
+ buffer = bundle_context_manager.get_buffer(buffer_id, transform_id)
+ assert buffer is not None
Review Comment:
```suggestion
```
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