[jira] [Work logged] (BEAM-3706) Update CombinePayload to improved model for Portability

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3706?focusedWorklogId=82897&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-82897 ]

ASF GitHub Bot logged work on BEAM-3706:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/Mar/18 20:34
            Start Date: 21/Mar/18 20:34
    Worklog Time Spent: 10m 
      Work Description: youngoli opened a new pull request #4924: [BEAM-3706] Removing side inputs from CombinePayload proto.
URL: https://github.com/apache/beam/pull/4924
 
 
   I'm changing the portable model for Combines to one without side inputs (details [here](https://docs.google.com/document/d/1-3mEs3Y7bIkJ0hmQ6SiHpVIFu5vbY6Zcpw-7tOMVg4U/edit?usp=sharing)). Also without Parameters, but that doesn't seem to be used at all, so not much of a change there.
   
   In order to have the model continue working without the side inputs I made these changes:
   
   - Removed all mention of side inputs from CombinePayload and added checks so that to-proto translation of Combines with side inputs won't work.
   - Changed CombineTranslation.translate to return an empty FunctionSpec instead if the Combine has side inputs. This means combines with side inputs are now passed to the runner as unknown composite transforms. (Note that this differs from the doc which mentions completely removing the composite from side input combines. This approach is much easier with the current code, and the focus of this PR is getting side inputs out of CombinePayload, so the rest will be done in other PRs.)
   - CombineTranslation.getSideInputs was completely removed, so some changes were made to the Flink runner to adjust for the fact that Combines will no longer have side inputs. The changes made there were very simple since it was intended just to have things compile with the change, so some refactoring should probably be done there in the future.
   - Finally, updated the CombineTranslation tests to account for these changes by making sure the existing tests don't use side inputs and adding a new test to ensure that side inputs fail in the to-proto translation.
   
   I ran tests and validation for Java, but wasn't getting the Python tests and validation to work. A cursory look at Python didn't see any mention of side inputs along with CombinePayload, so I'm crossing my fingers.
   
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 82897)
            Time Spent: 10m
    Remaining Estimate: 0h

> 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: 10m
>  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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