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https://issues.apache.org/jira/browse/BEAM-11715?focusedWorklogId=564873&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-564873
 ]

ASF GitHub Bot logged work on BEAM-11715:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Mar/21 19:33
            Start Date: 11/Mar/21 19:33
    Worklog Time Spent: 10m 
      Work Description: robertwb commented on a change in pull request #14193:
URL: https://github.com/apache/beam/pull/14193#discussion_r592664521



##########
File path: sdks/python/apache_beam/runners/dataflow/dataflow_runner.py
##########
@@ -494,11 +494,7 @@ def run_pipeline(self, pipeline, options):
       if pre_optimize == 'none' or pre_optimize == 'default':
         phases = []
       elif pre_optimize == 'all':
-        phases = [
-            # TODO(BEAM-11694): Enable translations.pack_combiners
-            # translations.pack_combiners,
-            translations.sort_stages
-        ]
+        phases = [translations.pack_combiners, translations.sort_stages]

Review comment:
       The goal is that it will by the time this release actually goes out. 




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 564873)
    Time Spent: 12.5h  (was: 12h 20m)

> Combiner packing creates an incorrect proto
> -------------------------------------------
>
>                 Key: BEAM-11715
>                 URL: https://issues.apache.org/jira/browse/BEAM-11715
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Chamikara Madhusanka Jayalath
>            Assignee: Yifan Mai
>            Priority: P1
>             Fix For: 2.28.0
>
>          Time Spent: 12.5h
>  Remaining Estimate: 0h
>
> Seems like optimization creates a CombinePerKey transform that does not have 
> any sub-transforms. We should fix this by preserving the old structure for 
> CombinePerKey (GBK+CombineValues composite).



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