Hello everyone,

 First, I'm Henning and I have been working on the container model used by
Google Cloud Dataflow. I hope to contribute to the Beam portability effort
leveraging some of that knowledge.

 I'd like to propose a container contract for the SDK harness in the Fn API
model [1]. The proposal in particular details how a runner should start SDK
harness containers, which will allow progress on developing concrete
containers for each SDK (such as BEAM-2600).

The proposal is here:


Comments welcome!


[1] https://s.apache.org/beam-fn-api

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