Henning Korsholm Rohde created BEAM-2899:
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Summary: 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 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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