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https://issues.apache.org/jira/browse/BEAM-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh resolved BEAM-2430.
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       Resolution: Done
    Fix Version/s: 2.3.0

I claim that a {{FnApiDoFnRunner}} is the wrong abstraction. However, a similar 
concept exists in the SdkHarnessClient, BundleProcessor, and ActiveBundle 
abstractions introduced in [https://github.com/apache/beam/pull/4472,] which is 
what clients who wish to use the portability framework should use when sending 
data to a remote Sdk Harness.

> Java FnApiDoFnRunner to share across runners
> --------------------------------------------
>
>                 Key: BEAM-2430
>                 URL: https://issues.apache.org/jira/browse/BEAM-2430
>             Project: Beam
>          Issue Type: New Feature
>          Components: runner-core
>            Reporter: Kenneth Knowles
>            Assignee: Thomas Groh
>            Priority: Major
>              Labels: portability
>             Fix For: 2.3.0
>
>
> As the portability framework comes into focus, let's fill out the support 
> code for making it easy to onboard a new runner.
> There is some amount of using the Fn API that has to do only with the fact 
> that a runner is implemented in Java, and is not specific to that runner. 
> This should be part of the runners-core library, and designed so that a 
> runner can set it up however it likes, and just pass elements without having 
> to explicitly manage things like requests, responses, protos, and coders.



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