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https://issues.apache.org/jira/browse/BEAM-646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856907#comment-15856907
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ASF GitHub Bot commented on BEAM-646:
-------------------------------------
GitHub user tgroh opened a pull request:
https://github.com/apache/beam/pull/1939
[BEAM-646] Add ReplacementOutput
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---
This is used to construct mappings between the original and replacement
PValues in an output, in order to permit the Pipeline to replace all of
the outputs generated by replacement transforms with the originals so
elements flow through the graph appropriately.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgroh/beam replacement_output
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/1939.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1939
----
----
> Get runners out of the apply()
> ------------------------------
>
> Key: BEAM-646
> URL: https://issues.apache.org/jira/browse/BEAM-646
> Project: Beam
> Issue Type: Improvement
> Components: beam-model-runner-api, sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Thomas Groh
>
> Right now, the runner intercepts calls to apply() and replaces transforms as
> we go. This means that there is no "original" user graph. For portability and
> misc architectural benefits, we would like to build the original graph first,
> and have the runner override later.
> Some runners already work in this manner, but we could integrate it more
> smoothly, with more validation, via some handy APIs on e.g. the Pipeline
> object.
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