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https://issues.apache.org/jira/browse/BEAM-2899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269623#comment-16269623
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ASF GitHub Bot commented on BEAM-2899:
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tgroh commented on issue #4105: [BEAM-2899]  Fork FnDataService from 
runners-core
URL: https://github.com/apache/beam/pull/4105#issuecomment-347691704
 
 
   run java precommit
   

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> Universal Local Runner
> ----------------------
>
>                 Key: BEAM-2899
>                 URL: https://issues.apache.org/jira/browse/BEAM-2899
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-core
>            Reporter: Henning Rohde
>            Assignee: Thomas Groh
>              Labels: portability
>
> To make the portability effort tractable, we should implement a Universal 
> Local Runner (ULR) in Java that runs in a single server process plus docker 
> containers for the SDK harness containers. It would serve multiple purposes:
>   (1) A reference implementation for other runners. Ideally, any new feature 
> should be implemented in the ULR first.
>   (2) A fully-featured test runner for SDKs who participate in the 
> portability framework. It thus complements the direct runners.
>   (3) A test runner for user code that depends on or customizes the runtime 
> environment. For example, a DoFn that shells out has a dependency that may be 
> satisfied on the user's desktop (and thus works fine on the direct runner), 
> but perhaps not by the container harness image. The ULR allows for an easy 
> way to find out.
> The Java direct runner presumably has lots of pieces that can be reused.



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