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https://issues.apache.org/jira/browse/BEAM-646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864228#comment-15864228
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ASF GitHub Bot commented on BEAM-646:
-------------------------------------

GitHub user tgroh opened a pull request:

    https://github.com/apache/beam/pull/1998

    [BEAM-646] Add Pipeline#replaceTransform

    Be sure to do all of the following to help us incorporate your contribution
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     - [ ] Make sure the PR title is formatted like:
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    ---
    This is the base method for Pipeline Surgery. It takes a
    PTransformMatcher and a PTransformOverrideFactory, and replaces all
    matching PTransforms with the result of the Override Factory.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/tgroh/beam replace_transform

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/beam/pull/1998.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 #1998
    
----
commit 963a6b31f5d670ddebac7d5347697948c8463607
Author: Thomas Groh <tg...@google.com>
Date:   2017-02-09T19:40:50Z

    Add Pipeline#replaceTransform
    
    This is the base method for Pipeline Surgery. It takes a
    PTransformMatcher and a PTransformOverrideFactory, and replaces all
    matching PTransforms with the result of the Override Factory.

----


> 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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