tvalentyn commented on code in PR #32082:
URL: https://github.com/apache/beam/pull/32082#discussion_r1725421294


##########
sdks/python/apache_beam/transforms/util.py:
##########
@@ -802,6 +802,13 @@ class BatchElements(PTransform):
   corresponding to its contents. Each batch is emitted with a timestamp at
   the end of their window.
 
+  When the max_batch_duration_secs arg is provided, a stateful implementation
+  of BatchElements is used to batch elements across bundles. This is most
+  impactful in streaming applications where many bundles only contain one
+  element. Larger max_batch_duration_secs values will reduce the throughput of

Review Comment:
   so batching can cause the pipeline to emit less # of elements per 
sufficiently large unit of time?



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