robertwb commented on a change in pull request #14161:
URL: https://github.com/apache/beam/pull/14161#discussion_r589810592
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File path: sdks/python/apache_beam/portability/python_urns.py
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@@ -55,3 +55,8 @@
# and artifact fetching code.
# (Used for testing.)
SUBPROCESS_SDK = "beam:env:harness_subprocess_python:v1"
+
+# An annotation that indicates combiner packing is OK in all sub-transforms
+# of this transform. This optimization may result in renamed counters and
+# PCollection element counts.
+APPLY_COMBINER_PACKING = "beam:annotation:apply_combiner_packing:v1"
Review comment:
Done.
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