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https://issues.apache.org/jira/browse/BEAM-8019?focusedWorklogId=314055&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-314055
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ASF GitHub Bot logged work on BEAM-8019:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 17/Sep/19 23:40
            Start Date: 17/Sep/19 23:40
    Worklog Time Spent: 10m 
      Work Description: chamikaramj commented on pull request #9390: 
[BEAM-8019] Several changes to support cross-language transforms on 
DataflowRunner
URL: https://github.com/apache/beam/pull/9390#discussion_r325415701
 
 

 ##########
 File path: sdks/python/apache_beam/pipeline.py
 ##########
 @@ -917,8 +917,20 @@ def is_side_input(tag):
         for tag, id in proto.outputs.items()}
     # This annotation is expected by some runners.
     if proto.spec.urn == common_urns.primitives.PAR_DO.urn:
-      result.transform.output_tags = set(proto.outputs.keys()).difference(
-          {'None'})
+      # Some external transforms require output tags to be not to be modified.
+      # So we randomly select one of the output tags as the main output and
+      # leave others as side outputs. Transform execution should not change
 
 Review comment:
   I updated the user (dataflow_runner) so this code can be removed. Left the 
result.transform.output_tags for now since there might be other users outside 
Beam (prob. should be done in a separate PR).
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 314055)
    Time Spent: 1h  (was: 50m)

> Support cross-language transforms for DataflowRunner
> ----------------------------------------------------
>
>                 Key: BEAM-8019
>                 URL: https://issues.apache.org/jira/browse/BEAM-8019
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-py-core
>            Reporter: Chamikara Jayalath
>            Assignee: Chamikara Jayalath
>            Priority: Major
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> This is to capture the Beam changes needed for this task.



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