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https://issues.apache.org/jira/browse/BEAM-3706?focusedWorklogId=85353&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-85353
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ASF GitHub Bot logged work on BEAM-3706:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 28/Mar/18 19:16
            Start Date: 28/Mar/18 19:16
    Worklog Time Spent: 10m 
      Work Description: youngoli commented on issue #4924: [BEAM-3706] Removing 
side inputs from CombinePayload proto.
URL: https://github.com/apache/beam/pull/4924#issuecomment-377003788
 
 
   So the previous changes were actually breaking the DirectRunner because it 
would translate a combine then immediately call getCombineFn on it. This worked 
fine when all combines were translated with CombineFns, but now that combines 
with side inputs aren't given CombineFns (or even Payloads) it was breaking. I 
fixed that issue by making those getters return Optional<> where appropriate, 
which should prevent further instances of assuming a CombineFn (or 
CombinePayload) is present when it isn't.
   
   @lukecwik
   This change was a bit involved so please take another look at this PR if you 
can.

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

    Worklog Id:     (was: 85353)
    Time Spent: 3h  (was: 2h 50m)

> Update CombinePayload to improved model for Portability
> -------------------------------------------------------
>
>                 Key: BEAM-3706
>                 URL: https://issues.apache.org/jira/browse/BEAM-3706
>             Project: Beam
>          Issue Type: Sub-task
>          Components: beam-model
>            Reporter: Daniel Oliveira
>            Assignee: Daniel Oliveira
>            Priority: Minor
>              Labels: portability
>          Time Spent: 3h
>  Remaining Estimate: 0h
>
> This will mean changing the proto definition in beam_runner_api, most likely 
> trimming out fields that are no longer necessary and adding any new ones that 
> could be useful. The majority of work will probably be in investigating if 
> some existing fields can actually be removed (SideInputs and Parameters for 
> example).



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