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https://issues.apache.org/jira/browse/BEAM-11715?focusedWorklogId=550462&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-550462
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ASF GitHub Bot logged work on BEAM-11715:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 09/Feb/21 22:31
            Start Date: 09/Feb/21 22:31
    Worklog Time Spent: 10m 
      Work Description: yifanmai commented on pull request #13877:
URL: https://github.com/apache/beam/pull/13877#issuecomment-776288678


   > Maybe we could simplify things by only supporting portable job submission?
   
   Even with portable job submission, the subtransform structure is different 
(CombineValues is a primitive rather than a composite). 
[CombineValuesPTransformOverride](https://github.com/apache/beam/blob/595c25263638b3d5624875e46b69a442cedb09a7/sdks/python/apache_beam/runners/dataflow/ptransform_overrides.py#L128)
 performs this substitution in DataflowRunner 
[before](https://github.com/apache/beam/blob/595c25263638b3d5624875e46b69a442cedb09a7/sdks/python/apache_beam/runners/dataflow/dataflow_runner.py#L479)
 the pipeline is converted to a proto. So the optimizer will still see the 
Dataflow-specific subtransform structure.


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

    Worklog Id:     (was: 550462)
    Time Spent: 10h 20m  (was: 10h 10m)

> 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: 10h 20m
>  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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