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https://issues.apache.org/jira/browse/BEAM-3221?focusedWorklogId=383167&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-383167
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ASF GitHub Bot logged work on BEAM-3221:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 06/Feb/20 21:32
            Start Date: 06/Feb/20 21:32
    Worklog Time Spent: 10m 
      Work Description: lukecwik commented on pull request #10779: [BEAM-3221] 
Clarify documentation for StandardTransforms.Primitives, Pipeline, and 
PTransform.
URL: https://github.com/apache/beam/pull/10779#discussion_r376093545
 
 

 ##########
 File path: model/pipeline/src/main/proto/beam_runner_api.proto
 ##########
 @@ -78,31 +78,45 @@ message Components {
 // A Pipeline is a hierarchical graph of PTransforms, linked
 // by PCollections.
 //
-// This is represented by a number of by-reference maps to nodes,
-// PCollections, SDK environments, UDF, etc., for
-// supporting compact reuse and arbitrary graph structure.
+//   Impulse -> PCollection -> ParDo -> PCollection -> GroupByKey -> ...
+//                                   \> PCollection -> ParDo      -> ...
 
 Review comment:
   Its a multi output one.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 383167)
    Time Spent: 2h 20m  (was: 2h 10m)

> Model pipeline representation improvements
> ------------------------------------------
>
>                 Key: BEAM-3221
>                 URL: https://issues.apache.org/jira/browse/BEAM-3221
>             Project: Beam
>          Issue Type: Improvement
>          Components: beam-model
>            Reporter: Henning Rohde
>            Priority: Major
>              Labels: portability
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> Collections of various (breaking) tweaks to the Runner API, notably the 
> pipeline representation.



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