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From "Henning Korsholm Rohde (JIRA)" <>
Subject [jira] [Created] (BEAM-2899) Universal Local Runner
Date Mon, 11 Sep 2017 18:42:00 GMT
Henning Korsholm Rohde created BEAM-2899:

             Summary: Universal Local Runner
                 Key: BEAM-2899
             Project: Beam
          Issue Type: Improvement
          Components: runner-core
            Reporter: Henning Korsholm Rohde
            Assignee: Kenneth Knowles

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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